Some standard content:
Mechanical Industry Standard of the People's Republic of China
Steel Castings for Pumps
Subject Content and Scope of Application
JB/T6880.293
This standard specifies the grades, technical requirements, test methods, inspection rules and markings, packaging, transportation and storage of steel castings for pumps (hereinafter referred to as castings).
This standard applies to sand-cast centrifugal pumps, mixed flow pumps, axial flow pumps, vortex pumps, water ring vacuum pumps, reciprocating pumps, screw pumps and gear pump castings.
Other types of pumps may also be adopted by reference according to their applicable parts. 2 Reference standards
GB1223
GB2100
GB6414
GB/T11350
GB/T11351
GB11352
JB/T5413
JB/T6879
3 Grades
Test method for intergranular corrosion tendency of stainless acid-resistant steel Technical conditions for acid-resistant steel castings
Surface roughness comparison sample casting surface
Casting size tolerance
Casting machining allowance
Casting weight tolerance
Casting carbon steel parts for general engineering
Technical conditions for acceptance of open blades of mixed flow pumps and axial flow pumps Size tolerance of flow-through parts of centrifugal pump castings
The grade of carbon steel parts shall comply with the provisions of Chapter 3 of GB11352. 3.1
3.2The grade of stainless acid-resistant steel castings shall comply with the provisions of Chapter 1 of GB2100. 4 Technical requirements
4.1 Chemical composition
4.1.1The chemical composition of carbon steel parts shall comply with the provisions of Article 4.2 of GB11352. 4.1.2The chemical composition of stainless acid-resistant steel castings shall comply with the provisions of Chapter 1 of GB2100. 4.2 Mechanical properties
4.2.1 The mechanical properties of carbon steel parts shall comply with the provisions of Article 4.3 of GB11352. 4.2.2 The mechanical properties of stainless acid-resistant steel castings shall comply with the provisions of Chapter 3 of GB2100. 4.3 Heat treatment
4.3.1 The heat treatment of carbon steel parts shall comply with the provisions of Article 4.4 of GB11352. 4.3.2 The heat treatment of stainless acid-resistant steel castings shall comply with the provisions of Chapter 2 of GB2100. 4.4 Intergranular corrosion tendency
Castings required to undergo intergranular corrosion tendency tests shall comply with the provisions of Chapter 4 of GB2100. 4.5 Geometric shape and size
The geometric shape and size of the castings shall comply with the requirements of the drawings. Approved by the Ministry of Machinery Industry on July 13, 1993
Implemented on July 1, 1994
JB/T6880.2-93
4.6 Dimension tolerance
The dimensional tolerance of general parts shall not be less than that specified in Table 1. The tolerance zone shall be set symmetrically to the basic dimensions of the casting. 4.6.1
Dimensional tolerances of castings
1. Outer edge of joint
2. Parts with basic dimensions less than or equal to 16 mm and wall thickness
1. Parts other than outer edge of joint and parts with basic dimensions greater than 16 mm2. Wall thickness greater than 16 mm that bears fluid pressure3. Wall thickness between 16 and 25 mm that does not bear fluid pressureWall thickness greater than 25 mm that does not bear fluid pressureNote: 1) Outer edge of joint—refers to the part where the outer edges of the joints of the parts need to be aligned with each other during assembly (including the outer edges of the connecting flanges of the pump and accessories).
2When the dimensional tolerances specified in Table 1 cannot meet the requirements, the tolerance grades that can be achieved by the casting process specified in Table A1 or Table A2 in Appendix A of GB6414 shall be indicated in the drawing or in the agreement agreed upon by both parties. 4.6.3 The dimensional tolerance of the flow-through part shall comply with the following provisions: a.
The dimensional tolerance of the flow-through part of the centrifugal pump casting shall comply with the provisions of JB/T6879; the open blades of the mixed flow pump and axial flow pump shall comply with the provisions of JB/T5413; special requirements shall be indicated in the drawings.
4.7 Misalignment value
The misalignment value of the casting shall be within the dimensional tolerance specified in Table 1. When the misalignment value is further restricted, it shall be indicated on the drawing. 4.8 Machining allowance
The machining allowance of the casting shall comply with the relevant provisions of GB/T11350; the machining allowance grade can be selected according to the CT13 grade specified in Table 1 in accordance with the provisions of Article 3.4 of GB/T11350. When there are special requirements, they shall be indicated in the drawings or other technical documents (including agreements).
4.9 Weight and weight tolerance
The weight of castings shall be calculated according to the density specified in Article 8.1.1 of GB/T11352. The weight tolerance of castings shall comply with the relevant provisions of GB/T11351. The weight tolerance grade of the casting shall not be lower than MT14. When the upper and lower deviation requirements of the casting weight are different or there are special requirements, they shall be indicated in the drawing or agreement. 4.9.3
When the weight tolerance of castings is used as the basis for acceptance, it shall be indicated in the drawing or technical documents (including the agreement). Surface quality
The surface roughness of the casting, if not marked on the drawing, shall not be lower than the provisions in Table 2. 4.10.1
Maximum size
Roughness R
≤400
>400~1000
The surface roughness of the open blades of mixed flow pumps and axial flow pumps shall comply with the provisions of JB/T5413. 4.10.2
Molding sand, core sand, core bone, sticky sand and inner cavity inclusions on castings of any size
should be cleaned up. The fleshy, scarred and pouring risers on the surface of the castings should be removed. If flame or arc cutting is used for cleaning, it should be done before heat treatment. 4.10.4The residual amount of casting pouring risers after cutting should not exceed the provisions in Table 3. 12
Arc gouging
Grooving head diameter or width
Non-machined surface
Carbon steel
Stainless acid-resistant steel
Non-machined surface
Carbon steel
Stainless acid-resistant steel
JB/T6880.2-93
≤150
>150~300
The remaining part of the grooving head on the non-machined surface of the casting shall be polished and trimmed to make a smooth transition with the casting surface. 4.10.5
The casting defects existing on the non-machined surface and the machined surface of the casting shall not exceed the requirements in Table 4. 4.11.1
On the same surface where the defect is located
Number of casting defects allowed
Surface where the defect is located
Static sealing surface
Surface after processing
Centering, positioning, matching
Mating surface
Other
machined surfaces
Surfaces that bear fluid pressure
and fluid flow||t t||Non-machined surface
The remaining non-machined
surface
defect size
does not affect the appearance and
strength shall not exceed
3mm at most, and shall not exceed
the smallest size of the surface where it is located
The maximum size shall not exceed
5mm at most, and shall not exceed
the smallest size of the surface where it is located
The maximum size shall not exceed
8mm at most, and shall not exceed|| The smallest dimension of the surface where tt||is located shall not exceed
6mm, and shall not exceed
the smallest dimension of the surface where tt||is located shall not exceed
15mm, and shall not exceed
the smallest dimension of the surface where tt||is located. The depth of the defect
shall not exceed
5mm, and shall not exceed
1/3 of the wall thickness
the deepest shall not exceed
6m m, and shall not exceed 1/4 of the wall thickness. ≤250. Defect spacing 1. The distance between the edge of the defect and the edge of the surface on which it is located shall not be less than 5 times the size of the defect. 2. The distance between two adjacent defects shall not be less than 5 times the size of the larger defect. JB/T 6880.2--93 4.11.2 For impeller and guide vane castings, casting defects at the blade inlet shall comply with the following provisions: a.Cold shut on one side of the blade: For guide vanes and closed impellers, the length of the cold shut shall not exceed 1/5 of the blade length; for semi-open and fully open impellers, the length of the cold shut shall not exceed 1/10 of the blade length, and the number of blades with this defect shall not exceed 1/3 of the total number of blades;
Lack of flesh at the blade entrance: When the diameter of the guide vane or impeller is less than or equal to 400mm, its radial depth shall not exceed b.
5mm; when the diameter of the guide vane or impeller is greater than 400mm, its radial depth shall not exceed 8mm, and the axial length shall not exceed Exceeding 1/4 of the blade width, and the number of blades with this defect shall not exceed 1/3 of the total number of blades. 4.11.3 After the casting is finely processed, the following types of pump parts are not allowed to have casting defects. And welding repair is not allowed before or after fine processing:
Dynamic friction parts, such as the sleeve where the packing is installed, the inner hole of the reciprocating pump cylinder and other friction surfaces; b.
Dynamic sealing parts, such as dynamic sealing surfaces such as sealing rings and balance discs; c.
Parts with high safety requirements, such as the high-pressure pump cylinder of a reciprocating pump. Determination and calculation of defect size:
For circular shapes, it is determined according to the maximum radial size; for non-circular shapes, it is calculated according to the following formula; D=VLB
Defect size, mm;
Where D—
Maximum size of the defect in the length direction. mm:
Maximum size of the defect in the width direction, mm.
Determination of the size of the surface where the defect is located:
For a plane with a circular shape, it is calculated by diameter; for a plane with a non-circular shape, it is determined by the maximum size in the width direction; b.
For a curved surface, such as an outer circular surface, an inner circular surface, a shell flow channel, etc., the circular surface is calculated by diameter, and the non-circular surface is determined by the minimum radial size.
4.12 Special requirements
When the purchaser has requirements for water pressure test, air pressure test, non-destructive testing, etc., it should be indicated in the drawing or agreed upon in the order agreement. 4.13 Repair of defects
Repair of defects. When one of the following conditions exists, welding repair is not allowed: 4.13.1
Honeycomb pores:
Pressure leakage. The quality cannot be ensured after welding repair; the drawing stipulates that parts or parts that are not allowed to be welded. When the defects of castings exceed the provisions in Table 4, welding repair is allowed if the service strength and service function can be ensured and the final accuracy of the pump parts is not affected by welding repair of castings. Welding repair of carbon steel parts and stainless acid-resistant steel castings shall comply with the provisions of Chapter 8 of GB2100 and the provisions of Appendix A (Supplement) of this standard. 5 Test methods
5.1 Chemical analysis, carbon steel parts shall comply with the provisions of Article 5.1 of GB11352. Stainless acid-resistant steel castings shall comply with the provisions of Chapter 12 of GB2100.
5.2 Mechanical property test, carbon steel parts shall comply with the provisions of Article 5.2 of GB11352. Stainless acid-resistant steel castings shall comply with the provisions of Chapter 13 of GB2100.
5.3 The intergranular corrosion tendency test of stainless acid-resistant steel castings shall comply with the provisions of GB1223. 5.4 The inspection of casting geometry and size shall be carried out by selecting the inspection gauges with corresponding accuracy. For the parts or related dimensions that cannot be directly inspected by the gauges, the inspection shall be carried out by using the template or the marking. 5.5 The determination of the nominal weight of the casting shall comply with the provisions of Article 8.1.2 of GB11352. 14
JB/T6880.2-93
5.6 The surface roughness inspection of the casting shall be carried out according to the comparison sample selected in GB6060.1. The inspection of casting surface defects shall be carried out by visual method. For the surfaces that cannot be directly seen by the eyes, the inspection may be carried out by using the endoscope. 5.7
5.8 Inspection of special conditions shall be carried out according to the provisions of Article 4.12 and the agreement or relevant regulations agreed upon by the supply and demand parties. 5.9
The inspection of welding repair of casting defects shall comply with the provisions of Appendix A. Inspection rules
Inspection of carbon steel castings shall comply with the following provisions of GB11352: a.
Inspection rights shall comply with the provisions of Article 6.1;
Inspection location shall comply with the provisions of Article 6.2;
Batch division shall comply with the provisions of Article 6.3; Chemical composition inspection shall comply with the provisions of Article 6.4; Mechanical properties inspection shall comply with the provisions of Article 6.5; e.
Rounding of test results shall comply with the provisions of Article 6.6. 6.2 Inspection of stainless acid-resistant steel castings shall comply with the following provisions: a.
Inspection rights, inspection locations, and batch divisions shall comply with the provisions of Articles 6.1, 6.2, and 6.3 of GB11352 respectively. Chemical composition inspection shall comply with the provisions of Chapter 12 of GB2100; b.
Mechanical property inspection shall comply with the provisions of Chapter 13 of GB2100: c.
When the mechanical property inspection results do not meet the requirements of Table 2 of GB2100, re-inspection may be carried out, and the re-inspection is allowed to be repeated with double samples of the same state. If it fails again, the batch of castings together with the spare samples may be re-heat treated, and then re-inspected according to the provisions of Chapter 13 of GB2100;
e. Intergranular corrosion tendency inspection shall be carried out according to order requirements; f. If the intergranular corrosion tendency inspection fails, the re-inspection shall comply with the provisions of Chapter 15 of GB2100. 6.3 The geometric shape and size of the casting shall be inspected according to the drawing. The first batch of castings and important parts shall be inspected piece by piece according to the drawings. General castings and castings produced by methods to ensure dimensional stability can be inspected by sampling, and the sampling method shall be agreed upon by the supply and demand parties. 6.4 The dimensional tolerance of castings shall be inspected in accordance with the requirements of Article 4.6. The inspection rules shall be in accordance with the provisions of Article 6.3. 6.5 The misalignment value shall be inspected piece by piece in accordance with the requirements of Article 4.7. 6.6 The machining allowance shall be inspected in accordance with the requirements of Article 4.8. The inspection rules shall be in accordance with the provisions of Article 6.3. The weight and weight tolerance of castings shall be inspected by sampling in accordance with the requirements of Article 4.9. 6.7
The surface quality shall be inspected piece by piece in accordance with the requirements of Article 4.10. The evaluation method of the surface roughness of castings shall comply with the provisions of relevant standards. The inspection of casting defects shall be inspected piece by piece in accordance with the requirements of Article 4.11, and the inspection of special requirements shall be inspected piece by piece in accordance with the requirements of Article 4.12. The welding repair inspection of castings shall be carried out piece by piece in accordance with the requirements of Article 4.13 and the provisions of Appendix A. Acceptance items, generally only the following items are accepted: a.
Geometric dimensions;
Surface quality;
Casting defects;
Chemical composition;
Mechanical properties (according to the agreed agreement); items required in the drawings;
Items agreed in the agreement between the supplier and the buyer.
Marking, packaging, transportation, storage
The marking, packaging, transportation and storage of castings shall comply with the provisions of Chapter 7 of GB11352. 15
Additional requirements for cast carbon steel parts
JB/T6880.2-93
Additional requirements for cast carbon steel parts shall comply with the relevant provisions of Chapter 8 of GB11352. 16
JB/T6880.2-93
Appendix A
Welding repair of steel castings for pumps
(Supplement)
This appendix specifies the welding repair process, post-weld heat treatment, welding rods and post-weld inspection. This appendix is applicable to steel castings for pumps that have no special requirements for welding repair in drawings or other technical documents. A1 Welding repair permission conditions
A1.1 When welding repair castings, the consent of the relevant functional departments shall be obtained. A1.2 The permission conditions for castings that require welding repair shall comply with the provisions of Article 4.13 of this standard. A1.3 According to its performance, for important parts or important parts and parts or parts that must be considered for safety factors, the welding repair notice procedure approved by the technical person in charge should be followed when welding. The welding repair notice should include the following contents: a.
Material of castings;
Defects;
Welding repair method;
Inspection method:
Heat treatment process specification (as needed):
Welding repair record (as needed).
A2 Welding repair process
A2.1 Preparation before welding repair
A2.1.1 For surface defects or internal defects that are difficult to judge with the naked eye, magnetic particle inspection, color inspection or X-ray, ultrasonic inspection and other inspection methods can be used. Determine the nature, location and size of the defects and formulate welding repair procedures. A2.1.2 The defective parts are cleaned by mechanical processing methods (drilling, grinding wheel grinding, milling, etc.) or thermal processing methods (carbon arc gouging, oxygen-acetylene cutting, etc.). When using hot working methods, preheating should be performed as specified. A2.1.3 When removing defects, the groove can be processed according to the specified groove type, and a stop hole should be drilled at the end of the extension crack. For non-penetrating parts, the groove type and size shall be in accordance with Figure A1 and Table A1; for penetrating parts, the groove type and size shall be in accordance with Figure A2 and Table A2. Figure A1
Groove depth h
Bottom radius R
Vertical welding, overhead welding
Groove bottom width
JB/T6880.2-93
Vertical welding, overhead welding
The parts after defect removal should be visually or color-checked, and the next process can be carried out only after it is determined that the defects have been completely removed. A2.1.4
A2.1.5For penetrating parts, a backing plate should be added. The backing plate material can be copper or a plate of the same material as the parent body, and the thickness is generally 3~5mm. If a backing plate of the same material as the parent body is used, it should be considered that it can be removed by mechanical processing. Before welding, dust, dirt, rust, oil and other debris on the welding part should be cleaned up. If necessary, acetone or alcohol can be used for cleaning. A2.1.6
Preheating before welding repair should be carried out according to the material of the workpiece according to Table A3. The preheating method can be heating in the furnace or heating with a gas flame. A2.1.7
Due to the size of the workpiece and the conditions of the heating furnace, it is not possible to preheat the whole part. It can be preheated locally, but the preheating temperature must be maintained during the welding repair process.
A2.2 Welding repair essentials
A2.2.1 Castings should be welded within the specified preheating temperature range, but the interlayer temperature should be strictly controlled within the specified range (carbon steel should not exceed 350℃, austenitic stainless steel should not exceed 170℃). Thermocouples and temperature measuring pens can be used to measure and control the workpiece temperature. A2.2.2 The selection of welding current should be carried out according to Table A4. A2.2.3 In order to ensure the quality of welding repair, narrow welds and multi-layer welding should be adopted. The width of the weld should be 23 times the diameter of the electrode. A2.2.4 Each weld should be carefully cleaned and inspected. When cracks in the parent material or cracks, lack of fusion, and lack of penetration are found in the welding part, the operation should be stopped and the welding should be re-done after cleaning. A2.2.5 In order to reduce stress and deformation, hammering can be adopted, but hammering is not allowed for the first layer of welds in the penetration part to prevent cracks.
A2.2.6 The height of the last layer of weld should exceed the surface of the workpiece by 0.5~3mm (that is, the height of the weld reinforcement is 0.5~3mm). A3 Post-weld heat treatment
The heat treatment specifications before and after welding repair of steel castings should be carried out according to Table A3. A3.1
A3.2 Heating method In principle, the steel casting should be heated as a whole in the furnace. If the workpiece and heating conditions are limited and cannot be heated in the furnace, gas flame or other methods can be used for local heating to achieve the purpose of stress relief annealing. A3.3 Temperature control The temperature can be measured by instruments, thermocouples, temperature measuring color pens or other methods to keep it within the predetermined range. A4 Welding rod
The drying conditions of the welding rod shall be carried out according to Table A5.
During the welding process, the welding rod can be placed in an insulation tube and returned to the drying box after welding. A4.22
After the welding rod is dried, if it is placed outside for more than 24 hours, it must be dried again according to the provisions of Table A5 before it can be used. A4.3
The chemical composition and mechanical properties of the weld metal are shown in Table A6. A4.4
A5 Post-weld inspection
JB/T6880.2-93
Except for non-destructive inspection of cast steel with special requirements, generally only visual inspection is performed on the weld repair part. A6 Records
According to the requirements of the welding repair notice, for castings that need welding repair records, operation records should be written, and the welding repair notice and operation records should be sent to the quality inspection department for safekeeping.
Material brand
ZG230-450
ZG270-500
ZG310-570
ZG1Cr13
ZG2Cr13
Welding rod brand
E5516-G
E5515-G
E1-13-15
E1-13-16
2G1Cr19Mo2E0-18-12Mo2-15
ZGCr28
E2-26-21-16
E2-26 -21-15
Specifications for preheating before welding and heat treatment after welding
Welding repair after rough machining of castings
600~650℃
2.5min/mm
650℃
150~250℃
>150℃
250--350℃
2.5min/mm
850℃
2.5min/mm
800~850C
2.5min/mm
700~750℃
2.5min n/mm
Welding repair after finishing
150250C
250--350℃
Spray water to cool immediately after welding every 4cm,
Repeat this welding repair
For rough
castings and welding repair after finishing
the repair area is small
less than 4cm,
no||heat treatment
after welding
Welding repair after finishing
If
austenitic stainless steel electrodes are used,
no||preheating is required before welding repair
After processing
Welding repair area
Less than 4cm
No need for heat treatment
Material brand
ZG0Cr18Ni9
ZG1Cr18Ni9
Welding rod brand
E019-10-16
E0-19-10-15
E0-19-10Nb-16
ZG0Cr18Ni9T
ZG1Cr18Ni9T1
E0-19-10Nb-15
ZGoCr10Ni12| |tt||ZG1Cr18Ni12
ZG1Cr18Mn8
E0-18-12Mo2Nb
E0-19-10-16
E0-19-10-15
JB/T6880.2-93
Continued Table A3
Welding repair after rough damage and rough machining of castings
10501100℃
Interlayer temperature does not exceed
Over 170℃Room temperature
2.5min/mm
1000~1050℃
2.5min /mm
11001150℃
2.5min/mm
1050~1100℃
2.5min/mm
Welding repair after finishing
(1) After finishing
, welding repair area
is less than 4cm
, no heat treatment
(2) Casting wall
thickness is less than
8mm, welding repair after finishing
, no heat treatment
(3) Chain parts are welded after solid solution treatment, no heat treatment is required (1) After processing, the welding area is less than 4cm, so it is not necessary to heat it. (2) During the welding process, the temperature between layers does not exceed 170℃. E5516-G E5515-G E1-13-15 E1-13-16 E0-18-12Mo2-15 E2-26-21-16 E2-26-21-15 EG-19-10-16 t||E0-19-10-15
E0-19-10Nb-16
E0-19-10Nb-15
E0-18-12Mo2Nb-16
Horizontal and vertical welding
JB/T6880.2-93
Table A4 welding current
Horizontal and vertical welding
80~120
80~110
70~100
70~110
70~100
Horizontal and vertical welding
Horizontal and vertical welding
Horizontal and vertical welding
Horizontal and vertical welding2-93
Vertical welding, overhead welding
The parts after defect removal should be visually inspected or colorized. Only after it is determined that the defects have been completely removed can the next process be carried out. A2.1.4
A2.1.5For the welding repair of penetrating parts, a backing plate should be added. The backing plate material can be copper or a plate of the same material as the parent body, and the thickness is generally 3~5mm. If a backing plate of the same material as the parent body is used, it should be considered that it can be removed by mechanical processing. Before welding, dust, dirt, rust, oil and other debris on the welding part should be cleaned up. If necessary, acetone or alcohol can be used for cleaning. A2.1.6
Preheating before welding repair should be carried out according to Table A3 according to the material of the workpiece. The preheating method can be heating in the furnace or heating with a gas flame. A2.1.7
If the overall preheating cannot be carried out due to the size of the workpiece and the conditions of the heating furnace, local preheating can be used. However, the preheating temperature must be maintained during the welding repair process.
A2.2 Repair welding tips
A2.2.1 Cast steel parts should be repaired by welding within the specified preheating temperature range, but the interlayer temperature should be strictly controlled within the specified range (carbon steel should not exceed 350℃, austenitic stainless steel should not exceed 170℃). Thermocouples and temperature measuring pens can be used to measure and control the workpiece temperature. A2.2.2 The selection of welding current should be carried out according to Table A4. A2.2.3 In order to ensure the quality of repair welding, narrow welds and multi-layer welding should be adopted. The width of the weld should be 23 times the diameter of the electrode. A2.2.4 Each weld should be carefully cleaned and inspected. When cracks in the parent material or cracks, lack of fusion, and lack of penetration are visually found in the welding part, the operation should be stopped and re-welded after cleaning. A2.2.5 In order to reduce stress and deformation, hammering can be adopted, but hammering is not allowed for the first layer of welds in the penetration part to prevent cracks.
A2.2.6 The height of the last weld seam should exceed the workpiece surface by 0.5~3mm (i.e. the weld reinforcement height is 0.5~3mm). A3 Post-weld heat treatment
The heat treatment specifications for steel castings before and after welding repair should be carried out according to Table A3. A3.1
A3.2 Heating method In principle, the steel casting should be heated in the furnace as a whole. If the workpiece and heating conditions cannot be heated in the furnace, gas flame or other methods can be used for local heating to achieve the purpose of stress relief annealing. A3.3 Temperature control can be measured by instruments, thermocouples, temperature measuring color pens or other methods to keep the temperature within the predetermined range. A4 Welding rod
The drying conditions of the welding rod shall be carried out according to Table A5.
During the welding process, the welding rod can be placed in the insulation tube and returned to the drying box after welding. A4.22
After the welding rod is dried, if it is placed outside for more than 24 hours, it must be dried again according to the provisions of Table A5 before it can be used. A4.3
The chemical composition and mechanical properties of the weld metal are shown in Table A6. A4.4
A5 Post-weld inspection
JB/T6880.2-93
Except for non-destructive inspection of cast steel with special requirements, visual inspection is generally only performed on the weld repaired parts. A6 Records
According to the requirements of the weld repair notice, the castings that need to be weld repaired should have operation records written, and the weld repair notice and operation records should be sent to the quality inspection department for safekeeping.
Material brand
ZG230-450
ZG270-500
ZG310-570
ZG1Cr13
ZG2Cr13
Welding rod brand
E5516-G
E5515-G
E1-13-15
E1-13-16
2G1Cr19Mo2E0-18-12Mo2-15
ZGCr28
E2-26-21-16
E2-26 -21-15
Specifications for preheating before welding and heat treatment after welding
Welding repair after rough machining of castings
600~650℃
2.5min/mm
650℃
150~250℃
>150℃
250--350℃
2.5min/mm
850℃
2.5min/mm
800~850C
2.5min/mm
700~750℃
2.5min n/mm
Welding repair after finishing
150250C
250--350℃
Spray water to cool immediately after welding every 4cm,
Repeat this welding repair
For roughbZxz.net
castings and welding repair after finishing
the repair area is small
less than 4cm,
no||heat treatment
after welding
Welding repair after finishing
If
austenitic stainless steel electrodes are used,
no||preheating is required before welding repair
After processing
Welding repair area
Less than 4cm
No need for heat treatment
Material brand
ZG0Cr18Ni9
ZG1Cr18Ni9
Welding rod brand
E019-10-16
E0-19-10-15
E0-19-10Nb-16
ZG0Cr18Ni9T
ZG1Cr18Ni9T1
E0-19-10Nb-15
ZGoCr10Ni12| |tt||ZG1Cr18Ni12
ZG1Cr18Mn8
E0-18-12Mo2Nb
E0-19-10-16
E0-19-10-15
JB/T6880.2-93
Continued Table A3
Welding repair after rough damage and rough machining of castings
10501100℃
Interlayer temperature does not exceed
Over 170℃Room temperature
2.5min/mm
1000~1050℃
2.5min /mm
11001150℃
2.5min/mm
1050~1100℃
2.5min/mm
Welding repair after finishing
(1) After finishing
, welding repair area
is less than 4cm
, no heat treatment
(2) Casting wall
thickness is less than
8mm, welding repair after finishing
, no heat treatment
(3) Chain parts are welded after solid solution treatment, no heat treatment is required (1) After processing, the welding area is less than 4cm, so it is not necessary to heat it. (2) During the welding process, the temperature between layers does not exceed 170℃. E5516-G E5515-G E1-13-15 E1-13-16 E0-18-12Mo2-15 E2-26-21-16 E2-26-21-15 EG-19-10-16 t||E0-19-10-15
E0-19-10Nb-16
E0-19-10Nb-15
E0-18-12Mo2Nb-16
Horizontal and vertical welding
JB/T6880.2-93
Table A4 welding current
Horizontal and vertical welding
80~120
80~110
70~100
70~110
70~100
Horizontal and vertical welding
Horizontal and vertical welding
Horizontal and vertical welding
Horizontal and vertical welding2-93
Vertical welding, overhead welding
The parts after defect removal should be visually inspected or colorized. Only after it is determined that the defects have been completely removed can the next process be carried out. A2.1.4
A2.1.5For the welding repair of penetrating parts, a backing plate should be added. The backing plate material can be copper or a plate of the same material as the parent body, and the thickness is generally 3~5mm. If a backing plate of the same material as the parent body is used, it should be considered that it can be removed by mechanical processing. Before welding, dust, dirt, rust, oil and other debris on the welding part should be cleaned up. If necessary, acetone or alcohol can be used for cleaning. A2.1.6
Preheating before welding repair should be carried out according to Table A3 according to the material of the workpiece. The preheating method can be heating in the furnace or heating with a gas flame. A2.1.7
If the overall preheating cannot be carried out due to the size of the workpiece and the conditions of the heating furnace, local preheating can be used. However, the preheating temperature must be maintained during the welding repair process.
A2.2 Repair welding tips
A2.2.1 Cast steel parts should be repaired by welding within the specified preheating temperature range, but the interlayer temperature should be strictly controlled within the specified range (carbon steel should not exceed 350℃, austenitic stainless steel should not exceed 170℃). Thermocouples and temperature measuring pens can be used to measure and control the workpiece temperature. A2.2.2 The selection of welding current should be carried out according to Table A4. A2.2.3 In order to ensure the quality of repair welding, narrow welds and multi-layer welding should be adopted. The width of the weld should be 23 times the diameter of the electrode. A2.2.4 Each weld should be carefully cleaned and inspected. When cracks in the parent material or cracks, lack of fusion, and lack of penetration are visually found in the welding part, the operation should be stopped and re-welded after cleaning. A2.2.5 In order to reduce stress and deformation, hammering can be adopted, but hammering is not allowed for the first layer of welds in the penetration part to prevent cracks.
A2.2.6 The height of the last weld seam should exceed the workpiece surface by 0.5~3mm (i.e. the weld reinforcement height is 0.5~3mm). A3 Post-weld heat treatment
The heat treatment specifications for steel castings before and after welding repair should be carried out according to Table A3. A3.1
A3.2 Heating method In principle, the steel casting should be heated in the furnace as a whole. If the workpiece and heating conditions cannot be heated in the furnace, gas flame or other methods can be used for local heating to achieve the purpose of stress relief annealing. A3.3 Temperature control can be measured by instruments, thermocouples, temperature measuring color pens or other methods to keep the temperature within the predetermined range. A4 Welding rod
The drying conditions of the welding rod shall be carried out according to Table A5.
During the welding process, the welding rod can be placed in the insulation tube and returned to the drying box after welding. A4.22
After the welding rod is dried, if it is placed outside for more than 24 hours, it must be dried again according to the provisions of Table A5 before it can be used. A4.3
The chemical composition and mechanical properties of the weld metal are shown in Table A6. A4.4
A5 Post-weld inspection
JB/T6880.2-93
Except for non-destructive inspection of cast steel with special requirements, visual inspection is generally only performed on the weld repaired parts. A6 Records
According to the requirements of the weld repair notice, the castings that need to be weld repaired should have operation records written, and the weld repair notice and operation records should be sent to the quality inspection department for safekeeping.
Material brand
ZG230-450
ZG270-500
ZG310-570
ZG1Cr13
ZG2Cr13
Welding rod brand
E5516-G
E5515-G
E1-13-15
E1-13-16
2G1Cr19Mo2E0-18-12Mo2-15
ZGCr28
E2-26-21-16
E2-26 -21-15
Specifications for preheating before welding and heat treatment after welding
Welding repair after rough machining of castings
600~650℃
2.5min/mm
650℃
150~250℃
>150℃
250--350℃
2.5min/mm
850℃
2.5min/mm
800~850C
2.5min/mm
700~750℃
2.5min n/mm
Welding repair after finishing
150250C
250--350℃
Spray water to cool immediately after welding every 4cm,
Repeat this welding repair
For rough
castings and welding repair after finishing
the repair area is small
less than 4cm,
no||heat treatment
after welding
Welding repair after finishing
If
austenitic stainless steel electrodes are used,
no||preheating is required before welding repair
After processing
Welding repair area
Less than 4cm
No need for heat treatment
Material brand
ZG0Cr18Ni9
ZG1Cr18Ni9
Welding rod brand
E019-10-16
E0-19-10-15
E0-19-10Nb-16
ZG0Cr18Ni9T
ZG1Cr18Ni9T1
E0-19-10Nb-15
ZGoCr10Ni12| |tt||ZG1Cr18Ni12
ZG1Cr18Mn8
E0-18-12Mo2Nb
E0-19-10-16
E0-19-10-15
JB/T6880.2-93
Continued Table A3
Welding repair after rough damage and rough machining of castings
10501100℃
Interlayer temperature does not exceed
Over 170℃Room temperature
2.5min/mm
1000~1050℃
2.5min /mm
11001150℃
2.5min/mm
1050~1100℃
2.5min/mm
Welding repair after finishing
(1) After finishing
, welding repair area
is less than 4cm
, no heat treatment
(2) Casting wall
thickness is less than
8mm, welding repair after finishing
, no heat treatment
(3) Chain parts are welded after solid solution treatment, no heat treatment is required (1) After processing, the welding area is less than 4cm, so it is not necessary to heat it. (2) During the welding process, the temperature between layers does not exceed 170℃. E5516-G E5515-G E1-13-15 E1-13-16 E0-18-12Mo2-15 E2-26-21-16 E2-26-21-15 EG-19-10-16 t||E0-19-10-15
E0-19-10Nb-16
E0-19-10Nb-15
E0-18-12Mo2Nb-16
Horizontal and vertical welding
JB/T6880.2-93
Table A4 welding current
Horizontal and vertical welding
80~120
80~110
70~100
70~110
70~100
Horizontal and vertical welding
Horizontal and vertical welding
Horizontal and vertical welding
Horizontal and vertical welding6
Preheating before welding repair should be carried out according to the material of the workpiece according to Table A3. The preheating method can be heating in the furnace or heating with gas flame A2.1.7
. Due to the size of the workpiece and the conditions of the heating furnace, it is not possible to preheat the whole part. It can be preheated locally, but during the welding repair process, its preheating temperature must be maintained.
A2.2 Essentials of welding repair
A2.2.1 Castings should be welded within the specified preheating temperature range, but the interlayer temperature should be strictly controlled within the specified range (carbon steel should not exceed 350℃, austenitic stainless steel should not exceed 170℃). Thermocouples and temperature measuring pens can be used to measure and control the workpiece temperature. A2.2.2 The selection of welding current should be carried out according to Table A4. A2.2.3 In order to ensure the quality of welding repair, narrow welds and multi-layer welding should be adopted. The width of the weld should be 23 times the diameter of the electrode. A2.2.4 Each weld should be carefully cleaned and inspected. When cracks are found in the base material or in the welded part, such as cracks, lack of fusion, and lack of penetration, the operation should be stopped and the weld should be cleaned and then re-welded. A2.2.5 In order to reduce stress and deformation, hammering can be adopted, but hammering is not allowed for the first layer of welds in the penetration part to prevent cracks.
A2.2.6 The height of the last layer of welds should exceed the surface of the workpiece by 0.5~3mm (that is, the weld reinforcement height is 0.5~3mm). A3 Post-weld heat treatment
The heat treatment specifications before and after welding of steel castings should be carried out according to Table A3. A3.1
A3.2 Heating method In principle, the steel casting should be heated in the furnace as a whole. If the workpiece and heating conditions cannot be heated in the furnace, gas flame or other methods can be used for local heating to achieve the purpose of stress relief annealing. A3.3 Temperature control The temperature can be measured by instruments, thermocouples, temperature measuring color pens or other methods to keep it within the predetermined range. A4 Welding rod
The drying conditions of welding rod shall be in accordance with Table A5.
During welding, welding rod can be placed in the heat preservation tube and returned to the drying box after welding. A4.22
After the welding rod is dried, if it is placed outside for more than 24 hours, it must be dried again in accordance with the provisions of Table A5 before it can be used. A4.3
The chemical composition and mechanical properties of weld metal are shown in Table A6. A4.4
A5 Post-weld inspection
JB/T6880.2-93
Except for non-destructive inspection of cast steel with special requirements, visual inspection is generally only performed on the weld repair parts. A6 Records
According to the requirements of the weld repair notice, the castings that need to be weld repaired should be recorded. The weld repair notice and operation records should be sent to the quality inspection department for safekeeping.
Material brand
ZG230-450
ZG270-500
ZG310-570
ZG1Cr13
ZG2Cr13
Welding rod brand
E5516-G
E5515-G
E1-13-15
E1-13-16
2G1Cr19Mo2E0-18-12Mo2-15
ZGCr28
E2-26-21-16
E2-26 -21-15
Specifications for preheating before welding and heat treatment after welding
Welding repair after rough machining of castings
600~650℃
2.5min/mm
650℃
150~250℃
>150℃
250--350℃
2.5min/mm
850℃
2.5min/mm
800~850C
2.5min/mm
700~750℃
2.5min n/mm
Welding repair after finishing
150250C
250--350℃
Spray water to cool immediately after welding every 4cm,
Repeat this welding repair
For rough
castings and welding repair after finishing
the repair area is small
less than 4cm,
no||heat treatment
after welding
Welding repair after finishing
If
austenitic stainless steel electrodes are used,
no||preheating is required before welding repair
After processing
Welding repair area
Less than 4cm
No need for heat treatment
Material brand
ZG0Cr18Ni9
ZG1Cr18Ni9
Welding rod brand
E019-10-16
E0-19-10-15
E0-19-10Nb-16
ZG0Cr18Ni9T
ZG1Cr18Ni9T1
E0-19-10Nb-15
ZGoCr10Ni12| |tt||ZG1Cr18Ni12
ZG1Cr18Mn8
E0-18-12Mo2Nb
E0-19-10-16
E0-19-10-15
JB/T6880.2-93
Continued Table A3
Welding repair after rough damage and rough machining of castings
10501100℃
Interlayer temperature does not exceed
Over 170℃Room temperature
2.5min/mm
1000~1050℃
2.5min /mm
11001150℃
2.5min/mm
1050~1100℃
2.5min/mm
Welding repair after finishing
(1) After finishing
, welding repair area
is less than 4cm
, no heat treatment
(2) Casting wall
thickness is less than
8mm, welding repair after finishing
, no heat treatment
(3) Chain parts are welded after solid solution treatment, no heat treatment is required (1) After processing, the welding area is less than 4cm, so it is not necessary to heat it. (2) During the welding process, the temperature between layers does not exceed 170℃. E5516-G E5515-G E1-13-15 E1-13-16 E0-18-12Mo2-15 E2-26-21-16 E2-26-21-15 EG-19-10-16 t||E0-19-10-15
E0-19-10Nb-16
E0-19-10Nb-15
E0-18-12Mo2Nb-16
Horizontal and vertical welding
JB/T6880.2-93
Table A4 welding current
Horizontal and vertical welding
80~120
80~110
70~100
70~110
70~100
Horizontal and vertical welding
Horizontal and vertical welding
Horizontal and vertical welding
Horizontal and vertical welding6
Preheating before welding repair should be carried out according to the material of the workpiece according to Table A3. The preheating method can be heating in the furnace or heating with gas flame A2.1.7
. Due to the size of the workpiece and the conditions of the heating furnace, it is not possible to preheat the whole part. It can be preheated locally, but during the welding repair process, its preheating temperature must be maintained.
A2.2 Essentials of welding repair
A2.2.1 Castings should be welded within the specified preheating temperature range, but the interlayer temperature should be strictly controlled within the specified range (carbon steel should not exceed 350℃, austenitic stainless steel should not exceed 170℃). Thermocouples and temperature measuring pens can be used to measure and control the workpiece temperature. A2.2.2 The selection of welding current should be carried out according to Table A4. A2.2.3 In order to ensure the quality of welding repair, narrow welds and multi-layer welding should be adopted. The width of the weld should be 23 times the diameter of the electrode. A2.2.4 Each weld should be carefully cleaned and inspected. When cracks are found in the base material or in the welded part, such as cracks, lack of fusion, and lack of penetration, the operation should be stopped and the weld should be cleaned and then re-welded. A2.2.5 In order to reduce stress and deformation, hammering can be adopted, but hammering is not allowed for the first layer of welds in the penetration part to prevent cracks.
A2.2.6 The height of the last layer of welds should exceed the surface of the workpiece by 0.5~3mm (that is, the weld reinforcement height is 0.5~3mm). A3 Post-weld heat treatment
The heat treatment specifications before and after welding of steel castings should be carried out according to Table A3. A3.1
A3.2 Heating method In principle, the steel casting should be heated in the furnace as a whole. If the workpiece and heating conditions cannot be heated in the furnace, gas flame or other methods can be used for local heating to achieve the purpose of stress relief annealing. A3.3 Temperature control The temperature can be measured by instruments, thermocouples, temperature measuring color pens or other methods to keep it within the predetermined range. A4 Welding rod
The drying conditions of welding rod shall be in accordance with Table A5.
During welding, welding rod can be placed in the heat preservation tube and returned to the drying box after welding. A4.22
After the welding rod is dried, if it is placed outside for more than 24 hours, it must be dried again in accordance with the provisions of Table A5 before it can be used. A4.3
The chemical composition and mechanical properties of weld metal are shown in Table A6. A4.4
A5 Post-weld inspection
JB/T6880.2-93
Except for non-destructive inspection of cast steel with special requirements, visual inspection is generally only performed on the weld repair parts. A6 Records
According to the requirements of the weld repair notice, the castings that need to be weld repaired should be recorded. The weld repair notice and operation records should be sent to the quality inspection department for safekeeping.
Material brand
ZG230-450
ZG270-500
ZG310-570
ZG1Cr13
ZG2Cr13
Welding rod brand
E5516-G
E5515-G
E1-13-15
E1-13-16
2G1Cr19Mo2E0-18-12Mo2-15
ZGCr28
E2-26-21-16
E2-26 -21-15
Specifications for preheating before welding and heat treatment after welding
Welding repair after rough machining of castings
600~650℃
2.5min/mm
650℃
150~250℃
>150℃
250--350℃
2.5min/mm
850℃
2.5min/mm
800~850C
2.5min/mm
700~750℃
2.5min n/mm
Welding repair after finishing
150250C
250--350℃
Spray water to cool immediately after welding every 4cm,
Repeat this welding repair
For rough
castings and welding repair after finishing
The repair area is small
less than 4cm,
no heat treatment is required after welding
Welding repair after finishing
If
austenitic stainless steel electrodes are used,
no preheating is required before welding repair
After processing
Welding area
Less than 4cm
No need for heat treatment
Material brand
ZG0Cr18Ni9
ZG1Cr18Ni9
Welding rod brand
E019-10-16
E0-19-10-15
E0-19-10Nb-16
ZG0Cr18Ni9T
ZG1Cr18Ni9T1
E0-19-10Nb-15
ZGoCr10Ni12| |tt||ZG1Cr18Ni12
ZG1Cr18Mn8
E0-18-12Mo2Nb
E0-19-10-16
E0-19-10-15
JB/T6880.2-93
Continued Table A3
Welding repair after rough damage and rough machining of castings
10501100℃
Interlayer temperature does not exceed
Over 170℃Room temperature
2.5min/mm
1000~1050℃
2.5min /mm
11001150℃
2.5min/mm
1050~1100℃
2.5min/mm
Welding repair after finishing
(1) After finishing
, welding repair area
is less than 4cm
, no heat treatment
(2) Casting wall
thickness is less than
8mm, welding repair after finishing
, no heat treatment
(3) Chain parts are welded after solid solution treatment, no heat treatment is required (1) After processing, the welding area is less than 4cm, so it is not necessary to heat it. (2) During the welding process, the temperature between layers does not exceed 170℃. E5516-G E5515-G E1-13-15 E1-13-16 E0-18-12Mo2-15 E2-26-21-16 E2-26-21-15 EG-19-10-16 t||E0-19-10-15
E0-19-10Nb-16
E0-19-10Nb-15
E0-18-12Mo2Nb-16
Horizontal and vertical welding
JB/T6880.2-93
Table A4 welding current
Horizontal and vertical welding
80~120
80~110
70~100
70~110
70~100
Horizontal and vertical welding
Horizontal and vertical welding
Horizontal and vertical welding
Horizontal and vertical welding6 The height of the last weld seam should exceed the workpiece surface by 0.5~3mm (i.e. the weld reinforcement height is 0.5~3mm). A3 Post-weld heat treatment
The heat treatment specifications for steel castings before and after welding repair should be carried out according to Table A3. A3.1
A3.2 Heating method In principle, the steel casting should be heated in the furnace as a whole. If the workpiece and heating conditions cannot be heated in the furnace, gas flame or other methods can be used for local heating to achieve the purpose of stress relief annealing. A3.3 Temperature control can be measured by instruments, thermocouples, temperature measuring color pens or other methods to keep it within the predetermined range. A4 Welding rod
The drying conditions of the welding rod shall be carried out according to Table A5.
During the welding process, the welding rod can be placed in the insulation tube and returned to the drying box after welding. A4.22
After the welding rod is dried, if it is placed outside for more than 24 hours, it must be dried again according to the provisions of Table A5 before it can be used. A4.3
The chemical composition and mechanical properties of the weld metal are shown in Table A6. A4.4
A5 Post-weld inspection
JB/T6880.2-93
Except for non-destructive inspection of cast steel with special requirements, visual inspection is generally only performed on the weld repaired parts. A6 Records
According to the requirements of the weld repair notice, the castings that need to be weld repaired should have operation records written, and the weld repair notice and operation records should be sent to the quality inspection department for safekeeping.
Material brand
ZG230-450
ZG270-500
ZG310-570
ZG1Cr13
ZG2Cr13
Welding rod brand
E5516-G
E5515-G
E1-13-15
E1-13-16
2G1Cr19Mo2E0-18-12Mo2-15
ZGCr28
E2-26-21-16
E2-26 -21-15
Specifications for preheating before welding and heat treatment after welding
Welding repair after rough machining of castings
600~650℃
2.5min/mm
650℃
150~250℃
>150℃
250--350℃
2.5min/mm
850℃
2.5min/mm
800~850C
2.5min/mm
700~750℃
2.5min n/mm
Welding repair after finishing
150250C
250--350℃
Spray water to cool immediately after welding every 4cm,
Repeat this welding repair
For rough
castings and welding repair after finishing
the repair area is small
less than 4cm,
no||heat treatment
after welding
Welding repair after finishing
If
austenitic stainless steel electrodes are used,
no||preheating is required before welding repair
After processing
Welding repair area
Less than 4cm
No need for heat treatment
Material brand
ZG0Cr18Ni9
ZG1Cr18Ni9
Welding rod brand
E019-10-16
E0-19-10-15
E0-19-10Nb-16
ZG0Cr18Ni9T
ZG1Cr18Ni9T1
E0-19-10Nb-15
ZGoCr10Ni12| |tt||ZG1Cr18Ni12
ZG1Cr18Mn8
E0-18-12Mo2Nb
E0-19-10-16
E0-19-10-15
JB/T6880.2-93
Continued Table A3
Welding repair after rough damage and rough machining of castings
10501100℃
Interlayer temperature does not exceed
Over 170℃Room temperature
2.5min/mm
1000~1050℃
2.5min /mm
11001150℃
2.5min/mm
1050~1100℃
2.5min/mm
Welding repair after finishing
(1) After finishing
, welding repair area
is less than 4cm
, no heat treatment
(2) Casting wall
thickness is less than
8mm, welding repair after finishing
, no heat treatment
(3) Chain parts are welded after solid solution treatment, no heat treatment is required (1) After processing, the welding area is less than 4cm, so it is not necessary to heat it. (2) During the welding process, the temperature between layers does not exceed 170℃. E5516-G E5515-G E1-13-15 E1-13-16 E0-18-12Mo2-15 E2-26-21-16 E2-26-21-15 EG-19-10-16 t||E0-19-10-15
E0-19-10Nb-16
E0-19-10Nb-15
E0-18-12Mo2Nb-16
Horizontal and vertical welding
JB/T6880.2-93
Table A4 welding current
Horizontal and vertical welding
80~120
80~110
70~100
70~110
70~100
Horizontal and vertical welding
Horizontal and vertical welding
Horizontal and vertical welding
Horizontal and vertical welding6 The height of the last weld seam should exceed the workpiece surface by 0.5~3mm (i.e. the weld reinforcement height is 0.5~3mm). A3 Post-weld heat treatment
The heat treatment specifications for steel castings before and after welding repair should be carried out according to Table A3. A3.1
A3.2 Heating method In principle, the steel casting should be heated in the furnace as a whole. If the workpiece and heating conditions cannot be heated in the furnace, gas flame or other methods can be used for local heating to achieve the purpose of stress relief annealing. A3.3 Temperature control can be measured by instruments, thermocouples, temperature measuring color pens or other methods to keep the temperature within the predetermined range. A4 Welding rod
The drying conditions of the welding rod shall be carried out according to Table A5.
During the welding process, the welding rod can be placed in the insulation tube and returned to the drying box after welding. A4.22
After the welding rod is dried, if it is placed outside for more than 24 hours, it must be dried again according to the provisions of Table A5 before it can be used. A4.3
The chemical composition and mechanical properties of the weld metal are shown in Table A6. A4.4
A5 Post-weld inspection
JB/T6880.2-93
Except for non-destructive inspection of cast steel with special requirements, visual inspection is generally only performed on the weld repaired parts. A6 Records
According to the requirements of the weld repair notice, the castings that need to be weld repaired should have operation records written, and the weld repair notice and operation records should be sent to the quality inspection department for safekeeping.
Material brand
ZG230-450
ZG270-500
ZG310-570
ZG1Cr13
ZG2Cr13
Welding rod brand
E5516-G
E5515-G
E1-13-15
E1-13-16
2G1Cr19Mo2E0-18-12Mo2-15
ZGCr28
E2-26-21-16
E2-26 -21-15
Specifications for preheating before welding and heat treatment after welding
Welding repair after rough machining of castings
600~650℃
2.5min/mm
650℃
150~250℃
>150℃
250--350℃
2.5min/mm
850℃
2.5min/mm
800~850C
2.5min/mm
700~750℃
2.5min n/mm
Welding repair after finishing
150250C
250--350℃
Spray water to cool immediately after welding every 4cm,
Repeat this welding repair
For rough
castings and welding repair after finishing
The repair area is small
less than 4cm,
no heat treatment is required after welding
Welding repair after finishing
If
austenitic stainless steel electrodes are used,
no preheating is required before welding repair
After processing
Welding area
Less than 4cm
No need for heat treatment
Material brand
ZG0Cr18Ni9
ZG1Cr18Ni9
Welding rod brand
E019-10-16
E0-19-10-15
E0-19-10Nb-16
ZG0Cr18Ni9T
ZG1Cr18Ni9T1
E0-19-10Nb-15
ZGoCr10Ni12| |tt||ZG1Cr18Ni12
ZG1Cr18Mn8
E0-18-12Mo2Nb
E0-19-10-16
E0-19-10-15
JB/T6880.2-93
Continued Table A3
Welding repair after rough damage and rough machining of castings
10501100℃
Interlayer temperature does not exceed
Over 170℃Room temperature
2.5min/mm
1000~1050℃
2.5min /mm
11001150℃
2.5min/mm
1050~1100℃
2.5min/mm
Welding repair after finishing
(1) After finishing
, welding repair area
is less than 4cm
, no heat treatment
(2) Casting wall
thickness is less than
8mm, welding repair after finishing
, no heat treatment
(3) Chain parts are welded after solid solution treatment, no heat treatment is required (1) After processing, the welding area is less than 4cm, so it is not necessary to heat it. (2) During the welding process, the temperature between layers does not exceed 170℃. E5516-G E5515-G E1-13-15 E1-13-16 E0-18-12Mo2-15 E2-26-21-16 E2-26-21-15 EG-19-10-16 t||E0-19-10-15
E0-19-10Nb-16
E0-19-10Nb-15
E0-18-12Mo2Nb-16
Horizontal and vertical welding
JB/T6880.2-93
Table A4 welding current
Horizontal and vertical welding
80~120
80~110
70~100
70~110
70~100
Horizontal and vertical welding
Horizontal and vertical welding
Horizontal and vertical welding
Horizontal and vertical welding5min/mm
650℃
150~250℃
>150℃
250--350℃
2.5min/mm||tt| |850℃
2.5min/mm
800~850C
2.5min/mm
700~750℃
2.5min/mm||tt ||Welding repair after finishing
150250 C
250--350℃
After welding every 4cm, spray water to cool immediately.
Repeat this method to repair
damage and fineness of castings. The welding area after processing is less than 4 cm, so heat treatment and finishing are not required after welding. |tt||After welding
If
austenitic stainless steel electrodes are used,
before welding
t||No preheating
After processing
Welding area
Less than 4cm
No need to heat
Material grade
ZG0Cr18Ni9| |tt||ZG1Cr18Ni9
Welding rod brand
E019-10-16
E0-19-10-15
E0-19-10Nb-16||tt| |ZG0Cr18Ni9T
ZG1Cr18 Ni9T1
E0-19-10Nb-15
ZGoCr10Ni12
ZG1Cr18Ni12
ZG1Cr18Mn8
E0-18-12Mo2Nb
E0-19- 10-16
E0-19-10-15
JB/T6880.2-93
Continued Table A3
Welding repair of rough castings and rough machining
1 0501100℃
Interlayer temperature does not exceed
170℃Room temperature
2.5min/mm
1000~1050℃
2.5min/mm|| tt||11001150℃
2.5min/mm
1050~1100℃
2.5min/mm
Welding repair after finishing
(1 )After processing
Welding area||tt| When the thickness of the casting wall is less than 4cm, it can be repaired by welding after machining. No heat treatment
(3) After the chain is solid
soldered
, it is possible
not to perform further
(1)After processing| When the welding area is less than 4 cm, it is not necessary to heat it. (2) Between layers during welding ||Temperature does not exceed
170℃
E5516-G
E5515-G
E1-13-15
E1-13-16| |tt||E0-18-12Mo2-15
E2-26-21-16
E2-26-21-15
EG-19-10-16||tt ||E0-19-10-15
E0-19-10Nb-16|| tt||E0-19-10Nb-15
E0-18-12Mo2Nb-16
Horizontal and vertical welding
JB/T6880.2-93
Table A4 Welding current
Horizontal, vertical welding
80~120
80~110
70~100
70~110
70~ 100
Horizontal and vertical welding
Horizontal and vertical welding
Horizontal and vertical welding5min/mm
650℃
150~250℃
>150℃
250--350℃
2.5min/mm||tt| |850℃
2.5min/mm
800~850C
2.5min/mm
700~750℃
2.5min/mm||tt ||Welding repair after finishing
150250 C
250--350℃
After welding every 4cm, spray water to cool immediately.
Repeat this method to repair
damage and fineness of castings. The welding area after processing is less than 4 cm, so heat treatment and finishing are not required after welding. |tt||After welding repair
If
austenitic stainless steel electrodes are used,
before welding repair
t||No preheating
After processing
Welding area
Less than 4cm
No need to heat
Material grade
ZG0Cr18Ni9| |tt||ZG1Cr18Ni9
Welding rod brand
E019-10-16
E0-19-10-15
E0-19-10Nb-16||tt| |ZG0Cr18Ni9T
ZG1Cr18 Ni9T1
E0-19-10Nb-15
ZGoCr10Ni12
ZG1Cr18Ni12
ZG1Cr18Mn8
E0-18-12Mo2Nb
E0-19- 10-16
E0-19-10-15
JB/T6880.2-93
Continued Table A3
Welding repair of rough castings and rough machining
1 0501100℃
Interlayer temperature does not exceed
170℃Room temperature
2.5min/mm
1000~1050℃
2.5min/mm|| tt||11001150℃
2.5min/mm
1050~1100℃
2.5min/mm
Welding repair after finishing
(1 )After processing
Welding area||tt| When the thickness of the casting wall is less than 4cm, it can be repaired by welding after machining. No heat treatment
(3) After the chain is solid
soldered
, it is possible
not to perform further
(1)After proce
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