Some standard content:
Mechanical Industry Standard of the People's Republic of China
Gray Iron Castings for Pumps
1 Subject Content and Scope of Application
JB/T6880.1-93
This standard specifies the grades, technical requirements, test methods, inspection rules and markings, packaging, transportation and storage of gray iron 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
GB6414
GB9439
GB/T11350
GB/T11351
JB/T5413
JB/T6879
3 Brand
Surface roughness comparison sample casting surface
Casting dimension tolerance
Gray cast iron
Casting machining allowance
Casting weight tolerance
Technical conditions for acceptance of open blades of mixed flow pumps and axial flow pumps Dimension tolerance of flow-through parts of centrifugal pump castings
The cast iron brand shall comply with the provisions of Chapter 3 of GB9439. 4 Technical requirements
4.1 Production method and chemical composition
The production method and chemical composition shall comply with the provisions of Article 4.1 of GB9439. 4.2 Mechanical properties
The mechanical properties shall comply with the provisions of Article 4.2 of GB9439. 4.3 Metallographic structure and heat treatment
The metallographic structure and heat treatment shall comply with the provisions of Article 4.3 of GB9439. 4.4 Geometric shape and size
The geometric shape and size of the casting shall comply with the requirements of the drawing. 4.5 Dimensional tolerance
4.5.1 The dimensional tolerance of general parts shall not be less than that specified in Table 1, and the tolerance zone setting shall be symmetrical to the basic size of the casting. 4.5.2
When the dimensional tolerance specified in Table 1 cannot meet the requirements or the casting is a small batch or a single piece, the tolerance grade that can be achieved by the process method specified in Table A1 or Table A2 in Appendix A of GB6414 shall be separately specified in the drawing or in the agreement agreed upon by both parties.
4.5.3 The dimensional tolerance of the flow-through parts shall comply with the following provisions: a.
The dimensional tolerance of the flow-through parts of centrifugal pump castings shall comply with the provisions of JB/T6879; the open blades of mixed flow pumps and axial flow pumps shall comply with the provisions of JB/T5413; b.
Approved by the Ministry of Machinery Industry on July 13, 1993
Implementation on July 1, 1994
c. Special requirements shall be indicated in the drawings.
Note: 1) The outer edge of the connection
Outer edge).
4.6 Dislocation value
JB/T6880.1-93
1. Outer edge of the connection
2. Wall thickness less than or equal to 16mm
1. Other parts except the outer edge of the connection
2. Wall thickness greater than 16mm for bearing fluid pressure 3. Wall thickness between 16 and 25mm for not bearing fluid pressure Wall thickness greater than 25mm for not bearing fluid pressure refers to the wall thickness of the pump during assembly In the casting, the misalignment value of the parts that need to be aligned with each other (including the connection flange between the pump and the accessories) should be within the dimensional tolerance specified in Table 1. When the misalignment value is further restricted, it should be indicated on the drawing. 4.7 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 CT12 grade specified in Table 1 and the provisions of Article 3.4 of GB/T11350. When special requirements are required, It should be indicated in the drawings or technical documents (including agreements). 4.8 Weight and weight tolerance
The weight of the casting shall be calculated according to the density specified in Article 4.7 of GB9439. 4.8.1
The weight tolerance of the casting shall comply with the relevant provisions of GB/T11351. The weight tolerance grade of the casting shall not be lower than MT13. When the upper and lower deviation requirements of the casting weight are different or there are special requirements, it should be indicated in the drawings or agreements. When the weight tolerance of the casting is used as When the acceptance basis is given, it shall be indicated in the drawing or technical documents (including the agreement). 4.9
Surface quality
The surface roughness of the casting, if not marked on the drawing, shall not be less than the requirements in Table 2. Table 2
Maximum size of casting
Roughness R,
>250~1000
The surface roughness of the open blades of mixed flow pumps and axial flow pumps shall comply with the requirements in JB/T5413 Appearance table Surface
Molding sand, core sand, core bone, sticky sand and internal inclusions on any size
castings shall be cleaned up. Excess flesh, scars and pouring mouths on the casting surface shall be removed and trimmed to make a smooth transition with the matrix. 4.10 Defects
Castings are not allowed to have defects such as cracks, cold shuts, shrinkage, etc. that affect the performance. The casting defects on the non-machined surface and the machined surface of the casting shall not exceed the requirements in Table 3. 4.10.2
Note: To obtain good appearance quality, it is best to fill the casting defects specified in Table 3 with fillers of similar color. 2
Surface where the defects are located
Static sealing surface
Centering, positioning,
matching surface
Parts that transmit torque (without affecting
appearance)
and parts that are washed
Do not affect the use
strength and appearance
Other machined surfaces
Surfaces subjected to fluid pressure and fluid
flowing surfaces
Do not affect the use
strength and appearance
Other non-machined surfaces
Defect size
Maximum size
3mm. and does not exceed
The minimum size of the surface
Maximum size
5mm. and does not exceed The minimum size of the surface where
does not exceed 2mm at most
does not exceed
6mm at most. And does not exceed
the minimum size of the surface where
does not exceed
6mm at most, and does not exceed
the minimum size of the surface where
does not exceed
8mm at most, and does not exceed
the minimum size of the surface where
JB/T 6880.1-93
Number of casting defects allowed on the same surface where the defect is located
Defect depth
The maximum depth shall not exceed
5mm and shall not exceed
1/S of the wall thickness
Defect spacing
1. The edge of the defect shall not be
less than 2
of the defect size from the edge of the surface where the defect is located. 2. The distance from the edge of the defect to the edge
shall not be less than
2 of larger defect size
JB/T6880.1-93
4.10.3 After finishing of castings, the following types of pump parts are not allowed to have residual casting defects, and welding repair is not allowed before or after finishing:
dynamic friction parts, such as sleeves at packing places, reciprocating cylinder body inner holes and other friction surfaces; a.
dynamic sealing parts, such as dynamic sealing surfaces such as sealing rings and balancing discs; b.
parts with high safety requirements, such as high-pressure pump cylinders of reciprocating pumps. c.
4.10.4 Determination and calculation of defect size; for circular shapes, it is determined according to the maximum radial size; a.
for non-circular shapes, it is calculated according to the following formula: D=VLB
where; D-defect size, mm
L maximum size of defect length direction, mm;
B maximum size of defect width direction, mm.
4.10.5 Determination of the size of the surface where the defect is located: a.
For a plane with a circular shape, it is calculated according to the outer diameter; b. For a plane with a non-circular shape, it is determined by the maximum size in the width direction; for a surface with a curved shape, such as an outer circular surface, an inner circular surface, a shell flow channel, etc., a circular surface is calculated according to the diameter, and a non-circular surface is calculated according to the minimum size in the diameter c.
4.11 Special requirements
When the purchaser has requirements for water pressure testing, air pressure testing, non-destructive testing, etc., it should be indicated in the drawing or agreed upon in the order agreement. 4.12 Repair of defects
4.12.1 When the defects of the casting exceed the provisions in Table 3, welding repair is allowed if the strength and function of use can be ensured and the final accuracy of the pump parts will not be affected by the welding repair of the casting. Welding repair should comply with the provisions of Appendix A (Supplementary Parts. 4.12.2. If local cracks or cold shuts occur in castings, welding is generally not allowed. When the casting has a large welding value and must be welded, it should be welded only when the strength, service life, safety and reliability can be guaranteed. 4.12.3 Parts or parts that are not allowed to be welded in the drawings should not be welded. 5
Test method
The preparation of test bars (blocks) and test specimens shall comply with the provisions of Article 5.1 of GB9439. 5.2 Mechanical property tests shall comply with the provisions of Article 5.2 of GB9439. 5.3 Chemical analysis shall comply with the provisions of Article 5.3 of GB9439. 5.4 Metallographic inspection shall comply with the provisions of Article 5.4 of GB9439. 5.5 Inspection of the geometric shape and size of castings shall select inspection gauges of corresponding accuracy. For parts or related dimensions that cannot be directly inspected by gauges, templates or line inspections can be used. The method for determining the nominal weight of castings shall comply with the provisions of Article 3.2 of GB11351. 5.6
The surface roughness test of castings shall be carried out according to the comparison sample selected in GB6060.1. The test of surface defects of castings shall comply with the provisions of Article 6.11 of GB9439. 5.8
The test of special requirements shall be carried out according to the provisions of Article 4.11 of this standard, the agreement agreed upon by the supplier and the buyer or the relevant regulations. The test of welding repair of casting defects shall comply with the provisions in Appendix A. Inspection rules
Inspection of castings shall comply with the following provisions in GB9439:6.1
Inspection rights shall comply with the provisions of Article 6.1;
Inspection location shall comply with the provisions of Article 6.2;
Batch delimitation shall comply with the provisions of Article 6.3;
Tensile test shall comply with the provisions of Article 6.4;
Hardness test shall comply with the provisions of Article 6.5;
JB/T6880.1-93
Metallographic structure inspection shall comply with the provisions of Article 6.6. f.
6.2 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 drawing. General castings and castings produced by methods to ensure dimensional stability can be sampled, and the sampling method shall be agreed upon by the supply and demand parties. 6.3 The dimensional tolerance of the casting shall be inspected according to the requirements of Article 4.5. Inspection rules shall be in accordance with the provisions of Article 6.2. The misalignment value shall be inspected piece by piece in accordance with the requirements of Article 4.6. 6.4
The machining allowance shall be inspected in accordance with the requirements of Article 4.7. The inspection rules shall be in accordance with the provisions of Article 6.2. 6.5
The weight and weight tolerance of castings shall be sampled in accordance with the requirements of Article 4.8. 6.6
The surface quality shall be inspected piece by piece in accordance with the requirements of Article 4.9. The method for evaluating the surface roughness of castings shall comply with the provisions of relevant standards. 6.7
The inspection of casting defects shall be inspected piece by piece in accordance with the requirements of Article 4.10. 6.8
The inspection of special requirements shall be inspected piece by piece in accordance with the requirements of Article 4.11. The inspection of casting weld repair shall be inspected piece by piece in accordance with the requirements of Article 4.12 and the provisions in Appendix A. Acceptance items, generally only the following items are accepted: a.
Geometric dimensions;
Surface quality;
Casting defects:
Mechanical properties:
Items required in the drawings;
Other items agreed upon in the agreement between the supply and demand parties. Marking, packaging, transportation, storage
The marking, packaging, transportation and storage of castings shall comply with the provisions of Chapter 7 of GB9439. 5
JB/T6880.193
Appendix A
Welding repair of gray cast iron parts for pumps
(Supplement)
This appendix specifies the welding repair method, welding repair process and welding repair inspection of gray cast iron parts (hereinafter referred to as castings). This appendix is applicable to gray cast iron parts for pumps that have no special provisions or special requirements for welding repair in drawings or other technical documents. Welding repair of ductile iron parts for pumps can also be adopted as a reference.
A1 Welding repair permission conditions
A1.1 When a casting needs to be repaired by welding, the consent of the relevant functional departments shall be obtained. A1.2 The permission conditions for castings that need to be repaired by welding shall comply with the provisions of Article 4.12 of this standard. According to their performance, for important parts or important parts and parts or parts that must be considered for safety factors, the welding repair notice procedures approved by the technical person in charge shall be carried out when repairing by welding. The welding repair notice shall include the following contents: a.
Defect situation:
Welding repair method;
Inspection method;
Whether to perform stress relief treatment or annealing treatment after welding (as needed); whether welding repair records are required (as needed). A2 Welding repair methods and scope of application
A2.1 Gas welding method
Gas welding method is a welding repair method that uses oxygen and acetylene as heat sources to melt the electrode and the matrix. When welding with this method, the casting absorbs more heat and is prone to deformation. After welding, annealing treatment should be carried out to eliminate stress. The characteristic of gas welding is that the color tone after welding is close to that of the parent body. A2.2 Arc welding method
Arc welding is an electric welding method using cast iron electrodes. This method can be divided into cold welding and hot welding. This standard only uses arc cold welding, which is mainly used for castings that are inconvenient to preheat and heat treat after welding. A2.3 Other methods
For other welding repair methods, as long as the welding is firm and reliable, the welding repair quality of the casting can be guaranteed, and the product function can be met, it is also allowed to be used.
A2.4 Scope of application
The scope of application of the welding repair method is specified in Table A1. Table A1
Welding repair methods
Arc cold welding
Gas welding wire for cast iron
Pure nickel electrode
Iron-nickel electrode
When casting defects occur in castings, effective measures can be taken before or after welding repair, and stress-relieving heat treatment or annealing treatment can be carried out to prevent deformation and not affect the final machining accuracy of the castings. Gas welding can be used.
When casting defects are found in castings during machining or after finishing, and effective post-welding heat treatment measures cannot be taken, arc cold welding can be used if the strength requirements are not high, it is determined that the use function can be ensured, and the deformation or stress deformation caused by local heat will not affect the final accuracy requirements.
The non-machining parts of the castings that are subjected to pressure or When casting defects are found in areas where strength requirements are not high, effective post-welding heat treatment measures cannot be taken. Under the condition of ensuring the service strength and not affecting the quality requirements by local deformation or stress deformation caused by heat, electric double cold welding can be used. However, since it is easy to harden after welding, it is not suitable for surfaces that are reprocessed after welding. A3 Welding repair process
A3.1 Gas welding
A3.1.1 Preparation before welding
JB/T6880.1-93
Use a flat shovel, chisel, grinding wheel or other methods to completely remove the inclusions in the casting defects. For cracks and cold shuts that meet the requirements of Article 4.12.2a.
of this standard, a V-shaped or X-shaped groove should be opened, and a cut-off hole should be drilled at the end of the ductile crack: b. In order to improve the fusion of the weld repair part and prevent the welding boundary from being quenched and the thermal deformation after welding, the weld repair should be preheated before the weld repair. The preheating temperature is 200-700℃. Small parts can be preheated as a whole and large parts can be preheated locally. When preheating locally, the preheating pattern is generally about 20 times the area of the weld repair part
Select welding wire that is basically consistent with the chemical composition of the parent body; welding wire, welding torch and oxygen pressure can be selected according to Table A2. Table A2
Welding wire diameter mm
Neutral flame is preferred;
Weld repair after sufficient preheating;
Welding torch aperture
Oxygen pressure MPa
When welding repair, the welding rod should be dipped in 201 flux while welding repair, and the molten part should be gently stirred with the welding rod to make the slag float completely. The welding repair should be carried out in the process of continuously removing the slag. A3.1.3 Post-weld treatment
After welding, the welded area should be heated to 600-700℃ with coke or charcoal, covered with straw ash or diatomaceous earth for insulation, and slow cooling. When the heating range after welding is more than 15 times the area of the welded area and the temperature exceeds 600℃, it is not necessary to heat it, and it can be directly insulated and slowly cooled.
After the welded area is cooled to room temperature, it should be repaired, leveled and polished according to the parent body with a grinding wheel or other methods, and carefully observed to confirm whether there are defects such as c.
cracks. Whether to perform non-destructive testing is determined according to design requirements or strength properties. d. When it is necessary to eliminate residual stress, it can be kept at 550-600℃ for 4h to eliminate stress. A3.2 Arc Cold Welding
A3.2.1 Preparation before Welding
The removal of casting defects shall be carried out in accordance with A3.1.1a (the groove after the removal of ductile cracks shall be carried out in accordance with A3.2.1b); a.
After the defective part is removed, a V-shaped or X-shaped groove with a 60° to 80° angle is opened. When the strength of the weld repair must be considered, it is better to open the groove into two sections according to Figure A1:
Use organic solvents or combustion to remove the oil and dirt in the defective part and the vicinity; arc cold welding is generally not preheated. If preheating is required according to the structure and defect of the casting, it should be noted on the welding repair notice. d.
A3.2.2 Welding repair
The electrode diameter and welding current can be selected according to Table A3. 7
Electrode diameter
JB/T6880.1-93
The selection of welding rods can refer to the applicable range and be selected according to Table A4. Table A4
Welding core composition
Nickel-iron alloy
Copper alloy
Copper core iron sheet or
Copper clad iron core
Coating type
Oxidized type
Low oxygen type
(vanadium alloyed)
Graphite type
Graphite type
Graphite type
Graphite type
Graphite type
Low ammonia type|| tt||Titanium calcium typewww.bzxz.net
Weld metal
High vanadium steel
Gray cast iron
Ductile iron
Nickel-iron alloy
Nickel-copper alloy
Power supply type
AC, DC
Reverse connection)
AC, DC
AC, DC
AC, DC
(Forward connection)
AC, DC
(Forward connection)
AC and DC
(Forward connection)
(Reverse connection)
AC and DC
Welding current A
70~100
100~140
Scope of application
General gray cast iron parts (preheating to 400℃; cannot be cut after welding) Gray cast iron parts with higher strength do not need to be preheated and can be processed after welding - General gray cast iron parts (preheating to 40 0℃)
Spheroidal graphite castings (500℃ hot welding, normalizing or annealing after welding)Gray cast iron parts, can be processed
Important, high-strength gray cast iron parts, ductile iron parts, can be processed, but slightly hard
For gray cast iron parts with low strength requirements, can be processed, poor crack resistance
Gray cast iron parts, good crack resistance, poor processability, low strengthWhen welding, the length of each single-layer welding is within 30mm, and hammering should be done after welding. When the welding part cools to about 100℃, the next welding can be carried out. When the welding is multi-layer welding, it is still repeated in the single-layer welding method; welding of thin-walled cast iron parts is prone to cracks when hammering, and a small hammer should be used to knock frequently; d.
When cracks occur after welding, the cracked part should be completely removed, and the welding preparation should be carried out according to A3.1.1b, and then the welding should be carried out again.
A3.2.3 Post-weld treatment
After welding, the entire welded area should be carefully and evenly hammered when it cools to an appropriate temperature to prevent cracks from occurring during the cooling process; after cooling to room temperature, the welded area should be repaired and leveled according to the parent body using a grinding wheel or other methods to confirm whether there are welded defects. b.
Whether non-destructive testing is required can be determined based on design requirements and strength properties. A4 Welding inspection
A4.1 Preparation before welding
A4.1.1 Check the size and nature of the defects. A4.1.2 Check whether the defects are completely removed. If arc welding is used for welding, the groove shape should also be checked to see if it meets the requirements of A3.2.1b.
A4.1.3 Check whether the defect-removed area and its vicinity are clean, and there should be no oil or dirt that affects the quality of the welding repair. A4.2 Post-weld inspection
A4.2.1 For weld repairs that require stress relief after welding, post-weld inspection should be carried out after stress relief heat treatment. 8
JB/T6880.193
A4.2.2. Whether the grinding and finishing of the weld repaired parts meet the requirements to confirm whether there are weld repair defects. A4.2.3 If the weld repaired parts are on the non-machined surface, check whether the weld repaired parts are repaired and leveled according to the parent body. A4.2.4 Whether the weld repair meets the quality requirements and whether there are weld repair defects after welding. In addition to the non-destructive testing that must be carried out, generally only visual appearance inspection is carried out.
A4.2.5 For castings that bear liquid pressure or gas pressure, a water pressure test or gas pressure test for air tightness should be carried out after weld repair. A4.3 Records
A4.3.1 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 submitted to the quality inspection department for safekeeping.
The items, content and format of the welding repair notice and welding repair record are provided as follows for reference: A4.3.2
Welding repair notice and welding repair record
Date:
Arc welding
Welding repair notice
Part code
Part name
Part material
Defect name
Defect removal method
Slope Mouth shape and size
After defect removal
Inspection method
Welding repair method
Battery welding
Welding rod brand (or chemical composition)
Stress elimination
Hydraulic pressure test
Air pressure test
Whether to record
Responsible person for welding repair plan
Plan maker
Opinions or comments Note:
Heat treatment
Approval:
Gas welding record
Electrode specification
Welding torque aperture
No.:
Arc welding record:
Electrode diameter:
Welding current:
Actual execution and operation record
Qualified or not
Operator
Actual welding repair situation and welding repair quality record or other instructions: Welding repair person in charge:
Note, the "actual welding repair situation or other instructions" in the table include: welding repair quality, actual stress relief situation, existing problems, etc. Inspector
Additional instructions:
JB/T6880.1-93
This standard is proposed and managed by Shenyang Pump Research Institute. This standard is drafted by Shenyang Pump Research Institute. The main drafter of this standard is Zhang Wenda.3 Post-weld treatment
After welding, the entire welded area should be carefully and evenly hammered when it cools to an appropriate temperature to prevent cracks from occurring during the cooling process; after cooling to room temperature, the welded area should be repaired and leveled according to the parent body with a grinding wheel or other methods to confirm whether there are welded defects. b.
Whether non-destructive testing is required can be determined based on design requirements and strength properties. A4 Welding inspection
A4.1 Preparation before welding
A4.1.1 Check the size and nature of defects. A4.1.2 Check whether the defects are completely removed. If arc welding is used for welding, the groove shape should also be checked to see if it meets the requirements of A3.2.1b.
A4.1.3 Check whether the defect-removed area and its vicinity are clean, and there should be no oil or dirt that affects the quality of the welding repair. A4.2 Post-weld inspection
A4.2.1 For weld repairs that require stress relief after welding, post-weld inspection should be carried out after stress relief heat treatment. 8
JB/T6880.193
A4.2.2. Whether the grinding and finishing of the weld repaired parts meet the requirements to confirm whether there are weld repair defects. A4.2.3 If the weld repaired parts are on the non-machined surface, check whether the weld repaired parts are repaired and leveled according to the parent body. A4.2.4 Whether the weld repair meets the quality requirements and whether there are weld repair defects after welding. In addition to the non-destructive testing that must be carried out, generally only visual appearance inspection is carried out.
A4.2.5 For castings that bear liquid pressure or gas pressure, a water pressure test or gas pressure test for air tightness should be carried out after weld repair. A4.3 Records
A4.3.1 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 submitted to the quality inspection department for safekeeping.
The items, content and format of the welding repair notice and welding repair record are provided as follows for reference: A4.3.2
Welding repair notice and welding repair record
Date:
Arc welding
Welding repair notice
Part code
Part name
Part material
Defect name
Defect removal method
Slope Mouth shape and size
After defect removal
Inspection method
Welding repair method
Battery welding
Welding rod brand (or chemical composition)
Stress elimination
Hydraulic pressure test
Air pressure test
Whether to record
Responsible person for welding repair plan
Plan maker
Opinions or comments Note:
Heat treatment
Approval:
Gas welding record
Electrode specification
Welding torque aperture
No.:
Arc welding record:
Electrode diameter:
Welding current:
Actual execution and operation record
Qualified or not
Operator
Actual welding repair situation and welding repair quality record or other instructions: Welding repair person in charge:
Note, the "actual welding repair situation or other instructions" in the table include: welding repair quality, actual stress relief situation, existing problems, etc. Inspector
Additional instructions:
JB/T6880.1-93
This standard is proposed and managed by Shenyang Pump Research Institute. This standard is drafted by Shenyang Pump Research Institute. The main drafter of this standard is Zhang Wenda.3 Post-weld treatment
After welding, the entire welded area should be carefully and evenly hammered when it cools to an appropriate temperature to prevent cracks from occurring during the cooling process; after cooling to room temperature, the welded area should be repaired and leveled according to the parent body with a grinding wheel or other methods to confirm whether there are welded defects. b.
Whether non-destructive testing is required can be determined based on design requirements and strength properties. A4 Welding inspection
A4.1 Preparation before welding
A4.1.1 Check the size and nature of defects. A4.1.2 Check whether the defects are completely removed. If arc welding is used for welding, the groove shape should also be checked to see if it meets the requirements of A3.2.1b.
A4.1.3 Check whether the defect-removed area and its vicinity are clean, and there should be no oil or dirt that affects the quality of the welding repair. A4.2 Post-weld inspection
A4.2.1 For weld repairs that require stress relief after welding, post-weld inspection should be carried out after stress relief heat treatment. 8
JB/T6880.193
A4.2.2. Whether the grinding and finishing of the weld repaired parts meet the requirements to confirm whether there are weld repair defects. A4.2.3 If the weld repaired parts are on the non-machined surface, check whether the weld repaired parts are repaired and leveled according to the parent body. A4.2.4 Whether the weld repair meets the quality requirements and whether there are weld repair defects after welding. In addition to the non-destructive testing that must be carried out, generally only visual appearance inspection is carried out.
A4.2.5 For castings that bear liquid pressure or gas pressure, a water pressure test or gas pressure test for air tightness should be carried out after weld repair. A4.3 Records
A4.3.1 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 submitted to the quality inspection department for safekeeping.
The items, content and format of the welding repair notice and welding repair record are provided as follows for reference: A4.3.2
Welding repair notice and welding repair record
Date:
Arc welding
Welding repair notice
Part code
Part name
Part material
Defect name
Defect removal method
Slope Mouth shape and size
After defect removal
Inspection method
Welding repair method
Battery welding
Welding rod brand (or chemical composition)
Stress elimination
Hydraulic pressure test
Air pressure test
Whether to record
Responsible person for welding repair plan
Plan maker
Opinions or comments Note:
Heat treatment
Approval:
Gas welding record
Electrode specification
Welding torque aperture
No.:
Arc welding record:
Electrode diameter:
Welding current:
Actual execution and operation record
Qualified or not
Operator
Actual welding repair situation and welding repair quality record or other instructions: Welding repair person in charge:
Note, the "actual welding repair situation or other instructions" in the table include: welding repair quality, actual stress relief situation, existing problems, etc. Inspector
Additional instructions:
JB/T6880.1-93
This standard is proposed and managed by Shenyang Pump Research Institute. This standard is drafted by Shenyang Pump Research Institute. The main drafter of this standard is Zhang Wenda.
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