JB/T 7167-1993 Standard for welding parts of rock drilling machinery and pneumatic tools
Some standard content:
Mechanical Industry Standard of the People's Republic of China
JB/T7167-93
Rock Drilling Machinery and Pneumatic Tools
General Technical Conditions for Welded Parts
Published on November 21, 1993
Ministry of Machinery Industry of the People's Republic of China
Implementation on March 1, 1994
Mechanical Industry Standard of the People's Republic of China
Rock Drilling Machinery and Pneumatic Tools
General Technical Conditions for Welded Parts
1 Subject Content and Scope of Application
JB/T7167-93
This standard specifies the use conditions of welding materials and raw materials, the requirements before and after raw materials are cut, and the positioning welding, welding, post-welding requirements, inspection and acceptance methods of structural parts.
This standard applies to manual arc welding, semi-automatic welding, automatic welding and gas shielded welding of welded parts of rock drilling machinery and pneumatic tools. 2 Reference standards
GB1300
GB2650
GB2651
GB2652
GB2653
GB2654
GB2655
GB2656
GB3323
GB5117
GB5118
GB8110
Stainless steel welding rod
Steel wire for welding
Impact test method for welded joints
Tensile test method for welded joints
Weld seams and deposits Metal tensile test method
Bending and flattening test method for welded joints
Hardness test method for welded joints and cladding metalsTest method for strain aging sensitivity of welded jointsFatigue test method for weld metal and welded jointsRadiography and quality grading of steel fusion welded butt jointsCarbon steel welding rods
Low alloy steel welding rodsWww.bzxZ.net
Steel welding wire for carbon dioxide gas shielded welding
ZBJ59002.3Quality and dimensional deviation of thermal cutting gas3 Materials
3.1The steel grade, specification, surface quality, etc. of raw materials (plates, types, etc.) used for welding structural parts shall comply with the requirements of drawings and relevant standards.
3.2 Carbon steel and low alloy steel welding rods shall comply with the provisions of GB5117 and GB5118. 3.3Welding steel wires shall comply with the provisions of GB1300 and GB8110. 3.4 When raw materials (plates, steel sections) and welding materials (welding rods, welding wires, flux, etc.) used for welding structural parts enter the factory, they must be accepted by the quality inspection department before they can be put into storage.
3.5 The substitution of raw materials and welding materials must be approved by the technical competent department. 4 Cutting
4.1 Surface treatment of cut parts
4.1.1 The surface pretreatment of materials can be carried out by pickling, shot blasting, sand blasting or other methods. The treated metal materials shall not have scale and other dirt.
4.1.2 When there is a requirement for pretreatment of the material surface, the parts should be coated with rust inhibitor or weldable primer (such as weldable zinc chromate primer) after rust removal. Approved by the Ministry of Machinery Industry on November 21, 1993
Implemented on March 1, 1994
JB/T7167-93
4.1.3 Structural parts that require tempering after welding and parts that have been surface treated may not be painted or rust-proofed temporarily. 4. 1.4
For parts that are coated with weldable materials, welding can be done only after the paint film is normal. Parts that have been stored for more than 6 months after rust prevention or parts whose rust prevention layer has failed should be rust-proofed and rust-proofed again before use. 4.2 Material cutting specification requirements
4.2.1 For steel with a carbon content greater than 0.27%, the gas-processed surface should be removed by mechanical processing methods by at least 2mm after gas cutting. 4. 2. 2
For metal plates with a thickness greater than or equal to 16mm, gas cutting should be used first. For metal plates with a thickness greater than or equal to 10mm and an aspect ratio greater than or equal to 16, gas cutting should be preferred. For metal plates with a thickness greater than 5mm and a curved shape, automatic or semi-automatic gas cutting equipment such as CNC, photoelectric, and profiling should be used, otherwise the shape should be ground with a grinding wheel. For metal plates with a thickness less than or equal to 5mm and a mostly curved shape, plasma cutting or punching and shearing machines and other 4.2.5
equipment should be used for cutting, and flame cutting shall not be used. 4.2.6 For metal materials cut by gas cutting, if there is no special requirement for the quality of the cutting surface, the flatness u of the cutting surface shall be inspected and accepted according to the provisions of Grade 1 in ZBJ59002.3, and the cutting surface flatness u shall be inspected according to Grade 3, and the cutting depth shall be inspected according to Grade 3. 4.2.7 The vertical slope of the edge and surface of the metal material cut by mechanical shearing shall not be greater than 1:10.4.2.8 The shearing surface of the cutting piece shall not have defects such as cracks, flash, and burrs. 4.3 Dimensions and geometric tolerances of blanking parts
4.3.1 The dimensional deviation values of blanking by mechanical shearing shall comply with the provisions of Table 1. Table 1
Basic dimensions
>80~120
>120~180
>180~260
>260~320
>320~640
>640～1000
>1000~1500
>1500～2000
>2000~3000
>3000~4000
4.3.2 The dimensional deviation values of blanking by gas production shall comply with the provisions of Table 2. Board
Basic size
>200~300
>300~480
≤100
>100~~200
>10~14
>16~32
>200~300
>14~18
>32~ 45
>300~450
Basic size
>480~640
>640~800
>800~1200
>1200~1800
>1800~2500
>2500~3500
>3500~4500
>4500~6000
≤100
JB/T7167-93
Continued Table 2
>100~200
Degree and type
>16~32
>200~300
>32~45
>300~450
4.3.3 The verticality and parallelism between the edges of the plate and other parts after gas cutting shall not be greater than half of the tolerance of the corresponding size. mm
After gas cutting, the verticality and parallelism of the cut section of the profile parts to its surface shall not be greater than half of the tolerance of the corresponding size. 4.3. 4
4.4 Bending of blanks
4.4.1 Carbon steel with a carbon content greater than or equal to 0.35%, low-alloy strength steel with a manganese content greater than or equal to 1.2% and less than or equal to 2.0%, and its plate with a bending radius R≤3 should be annealed. 4.4.2 When bending steel, the direction of the bending line should be perpendicular to the rolling direction of the steel. 4.4.3 The hot bending temperature of steel is generally 900-1100℃, and the temperature when bending is completed is not less than 700℃. For some ordinary low-alloy steels, slow cooling should be paid attention to. For some low-alloy coppers containing molybdenum and vanadium, the tempering embrittlement zone of about 600C should be opened to prevent fracture damage. 4.4.4 The quality requirements of steel and plates after bending and forming shall comply with the provisions of Articles 4.4.4.1 and 4.4.4.2. Regardless of whether the steel and plates are cold or hot bent, the bent parts shall not have cracks, serious thinning, obvious hammering and stamping marks, and shall not have obvious scratches such as pulling, scratching, rubbing, and bumping. When hot bending steel and plates, the bent parts shall not have serious decarburization. 4.4. 4. 2
The flatness tolerance of the plate after blanking shall comply with the provisions of Table 3. Table 3
Plate thickness
L=1000
≤1000~500
L-maximum range t-maximum distance height
The straightness tolerance of various steels after blanking shall comply with the provisions of Table 4. mm
True linearity!
L≤100≤1.0
L>1000≤
JB/T 716793
The maximum straightness of various steel sections shall not exceed 5.0. The bending radius, degree and corrugation depth tolerances of the front pipe shall be in accordance with the provisions of Table 5. 4.4.7
Deviation value of odd
radius R
Roundness at the
radius
R>75~125
R>125~300
R>300~460
R>400~1000
R>1000
R>75~100
R>100~125
R >125~160
R>160~200
R>200~300
R>300~400
R>400~500
R>500~600
The corrugation depth at the bend
303865160670
1.01.51.512.0
4.4.8 The deviation of the simplified body after bending before welding shall be in accordance with the provisions of Table 6. Diameter
Schematic diagram
Outer diameter D
>400~500
> 500~630
>630~800
> 800~1000
>1000~1250
>1250~1600
>1600~2000
> 2000~2500
>25003150
5 Positioning welding
Diameter deviation
ADu(±)
JB/T.7167-93
Surface convexity
5.1 The welded parts to be butt-welded should be qualified parts after inspection. Figure
Poultry body wall
>16~30
5.2 During tack welding, the welding rod and welding wire used should be the same model and brand as those used in formal welding. 5.3 During tack welding, it is prohibited to use strong force, hammer deformation and other means, and the weak stress connection between the welded parts should be ensured. 5.4 During tack welding, the welding interval and the mutual position deviation of the two welded parts should comply with the provisions of Articles 5.4.1 to 5.4.6 mm
5.4.1 The tack welding interval Ari, △r and lap length deviation △L between the welded parts before tack welding (see Figure 1, Figure 2, Figure 3) should comply with the provisions of Table 7.
Steel plate thickness
Lap length deviation 4
Positioning coal interval 4
Positioning interval
JB/T 7167--93
>16~24
When positioning steel (angle steel, I-beam, channel steel, etc.), its deviation (see Figure 4, Figure 5, Figure 6, Figure 7) shall comply with the requirements of Table 8. 5.4.2
Black steel high thickness stone
>100~240
Bs1000
≤0.015A
≤0.010piece
≤0.008A
B>1000
≤0.020h
≤0.015h
≤0.010yuan
When steel plates of equal thickness are butt-jointed, the misalignment e (see Figure 8) shall comply with the provisions of Table 9, but the maximum shall not exceed 2mm. Steel plate thickness 8
> 6~12
JB/T7167-93
Misalignment of the joint
5.4.4 When butt-jointing a load-bearing joint of a non-thick steel plate: If the difference in thickness between the two plates (3-8,) does not exceed the requirements of Table 10, the basic type and size of the welded joint shall be made according to the thicker size data: Otherwise, single-sided (as shown in Figure 9) or double-sided (as shown in Figure 10) thinning shall be performed on the thicker plate, and the thinning length L≥3(5-,).
Spring plate thickness 3,
Difference in thickness between the two plates (5-8)
When butt-jointing steel, the misalignment of the joint e (see Figure 11) shall comply with the requirements of Table 11. Figure 11
> 9~12
Height of steel section h
>180~360
JB/T 7167-93
Misalignment of joints
5.4.6 Structural parts after positioning welding shall be welded only after being accepted by the inspectors and marked with obvious weldable marks. 6 Welding
6.1 Sealing welding shall be carried out when there are no special requirements for welding structural parts, such as the ends of vertical plates, ribs, partitions, etc. and the gaps at the exposed ends. For welded parts of super-long or open structures, except for the needs of the solidification process, the welded parts shall be framed and leveled. 6.2
6.3 It is prohibited to strike an arc in non-welding areas or at the ends of welds. mm
6.4 There shall be no oxides, water marks, oil stains, dust and other contaminants on the welds of important structural parts and low-alloy high-strength steel and within 15mm on both sides.
6.5 Alkaline low-hydrogen type welding rods must be dried at 350-450℃ for 1-2 hours before use. After drying, they should be stored in a 100-150℃ insulation cylinder and taken out as needed. The welding rods should be dried quantitatively and used, and the number of repeated dryings should not exceed 2 times. 6.6 New steel grades, new welding rods or welding wires, and new welding processes used for the first time must undergo reliability tests before formal adoption, and can only be formally adopted after being evaluated as feasible.
6.7 When welding general structural parts in the open air, the ambient temperature is lower than -5℃, or there is heavy fog, strong winds above level 5, rain, snow, etc., welding is not allowed. If welding is necessary, corresponding measures should be taken. 6.8 For medium carbon steel, high carbon steel, alloy structural steel and low carbon steel large structural parts with plate thickness greater than 30mm, preheating, slow cooling after welding, tempering treatment and other measures should be considered before welding. For welded parts that cannot be preheated and tempered, 23-13 series titanium calcium type or low hydrogen type stainless steel welding rods can also be used, such as E1-23-13-16 (A302) and E1-23-13-15 (A307). 6.9 In case of broken line welds, arc closing or joints should be avoided at the welding corners to prevent stress concentration defects. 7 Requirements after welding
7.1 General requirements
7.1.1 Important welds must be marked with welder marks after welding 7.1.2 When welds require heat treatment, they should be immediately transferred to the heat treatment process after passing the post-weld inspection. 7.1.3 For welds that require slow cooling after welding, the interlayer temperature after welding shall not be less than the preheating temperature. 7.1.4 In addition to necessary corrections, the inspectors should also make a final inspection for welds after tempering and slow cooling, and transfer to the next process after passing the inspection.
7.2 Dimensional deviations and welding defects of welded parts 7.2.1 The shape deviations and weld defects of welds shall comply with the provisions of Table 12. 7.2.2 The limit deviations of the length dimensions of welded structural parts 41, t are shown in Figure 12, and their values shall comply with the provisions of Table 13. 7.2.3 The straightness, parallelism and flatness tolerances of welded structural parts shall comply with the relevant provisions of Articles 7.2.3.1 to 7.2.3.3. 7.2.3.1 The straightness tolerance of welded parts shall not exceed 1.5mm within a length of 1000mm, and shall not exceed 1.5% over the entire length. The maximum shall not exceed 8mm (the straightness tolerance of thin plate welded parts less than 3mm can be increased by 1/3 of the original tolerance value). 7.2.3.2 The parallelism tolerance between the surfaces of welded parts shall not exceed half of the corresponding size tolerance. 7.2.3.3 The flatness tolerance of the welding plane shall comply with the provisions of Table 14. 88 The deviation of the cylinder formed by bending before welding shall be in accordance with the provisions of Table 6. Diameter
Schematic diagram
Outer diameter D
>400~500
> 500~630
>630~800
> 800~1000
>1000~1250
>1250~1600
>1600~2000
> 2000~2500
>25003150
5 Positioning welding
Diameter deviation
ADu(±)
JB/T.7167-93
Surface convexity
5.1 The welded parts to be butt-welded should be qualified parts after inspection. Figure
Poultry body wall
>16~30
5.2 During tack welding, the welding rod and welding wire used should be the same model and brand as those used in formal welding. 5.3 During tack welding, it is prohibited to use strong force, hammer deformation and other means, and the weak stress connection between the welded parts should be guaranteed. 5.4 During tack welding, the welding interval and the mutual position deviation of the two welded parts should comply with the provisions of Articles 5.4.1 to 5.4.6 mm
5.4.1 The tack welding interval Ari, △r and lap length deviation △L between the welded parts before tack welding (see Figure 1, Figure 2, Figure 3) should comply with the provisions of Table 7.
Steel plate thickness
Lap length deviation 4
Positioning coal interval 4
Positioning interval
JB/T 7167--93
>16~24
When positioning steel (angle steel, I-beam, channel steel, etc.), its deviation (see Figure 4, Figure 5, Figure 6, Figure 7) shall comply with the requirements of Table 8. 5.4.2
Black steel high thickness stone
>100~240
Bs1000
≤0.015A
≤0.010piece
≤0.008A
B>1000
≤0.020h
≤0.015h
≤0.010yuan
When steel plates of equal thickness are butt-jointed, the misalignment e (see Figure 8) shall comply with the provisions of Table 9, but the maximum shall not exceed 2mm. Steel plate thickness 8
> 6~12
JB/T7167-93
Misalignment of the joint
5.4.4 When butt-jointing a load-bearing joint of a non-thick steel plate: If the difference in thickness between the two plates (3-8,) does not exceed the requirements of Table 10, the basic type and size of the welded joint shall be made according to the thicker size data: Otherwise, the thicker plate shall be single-sided (as shown in Figure 9) or double-sided (as shown in Figure 10) thinning, and the thinning length L≥3(5-,).
Spring plate thickness 3,
Difference in thickness between the two plates (5-8)
When butt-jointing steel, the misalignment of the joint e (see Figure 11) shall comply with the requirements of Table 11. Figure 11
> 9~12
Height of steel section h
>180~360
JB/T 7167-93
Misalignment of joints
5.4.6 Structural parts after positioning welding shall be welded only after being accepted by the inspectors and marked with obvious weldable marks. 6 Welding
6.1 Sealing welding shall be carried out when there are no special requirements for welding structural parts, such as the ends of vertical plates, ribs, partitions, etc. and the gaps at the exposed ends. For welded parts of super-long or open structures, except for the needs of the solidification process, the welded parts shall be framed and leveled. 6.2
6.3 It is prohibited to strike an arc in non-welding areas or at the ends of welds. mm
6.4 There shall be no oxides, water marks, oil stains, dust and other contaminants on the welds of important structural parts and low-alloy high-strength steel and within 15mm on both sides.
6.5 Alkaline low-hydrogen type welding rods must be dried at 350-450℃ for 1-2 hours before use. After drying, they should be stored in a 100-150℃ insulation cylinder and taken out as needed. The welding rods should be dried quantitatively and used, and the number of repeated dryings should not exceed 2 times. 6.6 New steel grades, new welding rods or welding wires, and new welding processes used for the first time must undergo reliability tests before formal adoption, and can only be formally adopted after being evaluated as feasible.
6.7 When welding general structural parts in the open air, the ambient temperature is lower than -5℃, or there is heavy fog, strong winds above level 5, rain, snow, etc., welding is not allowed. If welding is necessary, corresponding measures should be taken. 6.8 For medium carbon steel, high carbon steel, alloy structural steel and low carbon steel large structural parts with plate thickness greater than 30mm, preheating, slow cooling after welding, tempering treatment and other measures should be considered before welding. For welded parts that cannot be preheated and tempered, 23-13 series titanium calcium type or low hydrogen type stainless steel welding rods can also be used, such as E1-23-13-16 (A302) and E1-23-13-15 (A307). 6.9 In case of broken line welds, arc closing or joints should be avoided at the welding corners to prevent stress concentration defects. 7 Requirements after welding
7.1 General requirements
7.1.1 Important welds must be marked with welder marks after welding 7.1.2 When welds require heat treatment, they should be immediately transferred to the heat treatment process after passing the post-weld inspection. 7.1.3 For welds that require slow cooling after welding, the interlayer temperature after welding shall not be less than the preheating temperature. 7.1.4 In addition to necessary corrections, the inspectors should also make a final inspection for welds after tempering and slow cooling, and transfer to the next process after passing the inspection.
7.2 Dimensional deviations and welding defects of welded parts 7.2.1 The shape deviations and weld defects of welds shall comply with the provisions of Table 12. 7.2.2 The limit deviations of the length dimensions of welded structural parts 41, t are shown in Figure 12, and their values shall comply with the provisions of Table 13. 7.2.3 The straightness, parallelism and flatness tolerances of welded structural parts shall comply with the relevant provisions of Articles 7.2.3.1 to 7.2.3.3. 7.2.3.1 The straightness tolerance of welded parts shall not exceed 1.5mm within a length of 1000mm, and shall not exceed 1.5% over the entire length. The maximum shall not exceed 8mm (the straightness tolerance of thin plate welded parts less than 3mm can be increased by 1/3 of the original tolerance value). 7.2.3.2 The parallelism tolerance between the surfaces of welded parts shall not exceed half of the corresponding size tolerance. 7.2.3.3 The flatness tolerance of the welding plane shall comply with the provisions of Table 14. 88 The deviation of the cylinder formed by bending before welding shall be in accordance with the provisions of Table 6. Diameter
Schematic diagram
Outer diameter D
>400~500
> 500~630
>630~800
> 800~1000
>1000~1250
>1250~1600
>1600~2000
> 2000~2500
>25003150
5 Positioning welding
Diameter deviation
ADu(±)
JB/T.7167-93
Surface convexity
5.1 The welded parts to be butt-welded should be qualified parts after inspection. Figure
Poultry body wall
>16~30
5.2 During tack welding, the welding rod and welding wire used should be the same model and brand as those used in formal welding. 5.3 During tack welding, it is prohibited to use strong force, hammer deformation and other means, and the weak stress connection between the welded parts should be ensured. 5.4 During tack welding, the welding interval and the mutual position deviation of the two welded parts should comply with the provisions of Articles 5.4.1 to 5.4.6 mm
5.4.1 The tack welding interval Ari, △r and lap length deviation △L between the welded parts before tack welding (see Figure 1, Figure 2, Figure 3) should comply with the provisions of Table 7.
Steel plate thickness
Lap length deviation 4
Positioning coal interval 4
Positioning interval
JB/T 7167--93
>16~24
When positioning steel (angle steel, I-beam, channel steel, etc.), its deviation (see Figure 4, Figure 5, Figure 6, Figure 7) shall comply with the requirements of Table 8. 5.4.2
Black steel high thickness stone
>100~240
Bs1000
≤0.015A
≤0.010piece
≤0.008A
B>1000
≤0.020h
≤0.015h
≤0.010yuan
When steel plates of equal thickness are butt-jointed, the misalignment e (see Figure 8) shall comply with the provisions of Table 9, but the maximum shall not exceed 2mm. Steel plate thickness 8
> 6~12
JB/T7167-93
Misalignment of the joint
5.4.4 When butt-jointing a load-bearing joint of a non-thick steel plate: If the difference in thickness between the two plates (3-8,) does not exceed the requirements of Table 10, the basic type and size of the welded joint shall be made according to the thicker size data: Otherwise, single-sided (as shown in Figure 9) or double-sided (as shown in Figure 10) thinning shall be performed on the thicker plate, and the thinning length L≥3(5-,).
Spring plate thickness 3,
Difference in thickness between the two plates (5-8)
When butt-jointing steel, the misalignment of the joint e (see Figure 11) shall comply with the requirements of Table 11. Figure 11
> 9~12
Height of steel section h
>180~360
JB/T 7167-93
Misalignment of joints
5.4.6 Structural parts after positioning welding shall be welded only after being inspected and accepted by the inspection personnel and marked with obvious weldable marks. 6 Welding
6.1 Sealing welding shall be carried out when there are no special requirements for welding of structural parts, such as the ends of vertical plates, ribs, partitions, etc. and the gaps at the exposed ends. For welded parts of super-long or open structures, except for the needs of the solidification process, the welded parts shall be framed and leveled. 6.2
6.3 It is prohibited to strike an arc in non-welding areas or at the ends of welds. mm
6.4 There shall be no oxides, water marks, oil stains, dust and other contaminants on the welds of important structural parts and low-alloy high-strength steel and within 15mm on both sides.
6.5 Alkaline low-hydrogen type welding rods must be dried at 350-450℃ for 1-2 hours before use. After drying, they should be stored in a 100-150℃ insulation cylinder and taken out as needed. The welding rods should be dried quantitatively and used, and the number of repeated dryings should not exceed 2 times. 6.6 New steel grades, new welding rods or welding wires, and new welding processes used for the first time must be subjected to reliability tests before formal adoption, and can only be formally adopted after being evaluated as feasible.
6.7 When welding general structural parts in the open air, the ambient temperature is lower than -5℃, or there is heavy fog, strong winds above level 5, rain, snow, etc., welding is not allowed. If welding is necessary, corresponding measures should be taken. 6.8 For medium carbon steel, high carbon steel, alloy structural steel and low carbon steel larger structural parts with plate thickness greater than 30mm, preheating, slow cooling after welding, tempering treatment and other measures should be considered before welding. For welded parts that cannot be preheated and tempered, 23-13 series titanium calcium type or low hydrogen type stainless steel welding rods can also be used, such as E1-23-13-16 (A302) and E1-23-13-15 (A307). 6.9 In case of broken line welds, arc closing or joints should be avoided at the welding corners to prevent stress concentration defects. 7 Requirements after welding
7.1 General requirements
7.1.1 Important welds must be marked with welder marks after welding 7.1.2 When welds require heat treatment, they should be immediately transferred to the heat treatment process after passing the post-weld inspection. 7.1.3 For welds that require slow cooling after welding, the interlayer temperature after welding shall not be less than the preheating temperature. 7.1.4 In addition to necessary corrections, the inspectors should also make a final inspection for welds after tempering and slow cooling, and transfer to the next process after passing the inspection.
7.2 Dimensional deviations and welding defects of welded parts 7.2.1 Weld shape deviations and weld defects shall comply with the provisions of Table 12. 7.2.2 The limit deviations of the length dimensions of welded structural parts 41, t are shown in Figure 12, and their values shall comply with the provisions of Table 13. 7.2.3 The straightness, parallelism and flatness tolerances of welded structural parts shall comply with the relevant provisions of Articles 7.2.3.1 to 7.2.3.3. 7.2.3.1 The straightness tolerance of welded parts shall not exceed 1.5mm within a length of 1000mm, and shall not exceed 1.5% over the entire length. The maximum shall not exceed 8mm (the straightness tolerance of thin plate welded parts less than 3mm can be increased by 1/3 of the original tolerance value). 7.2.3.2 The parallelism tolerance between the surfaces of welded parts shall not exceed half of the corresponding size tolerance. 7.2.3.3 The flatness tolerance of the welding plane shall comply with the provisions of Table 14. 8) does not exceed the requirements of Table 10, the basic type and size of the welded joint shall be made according to the thicker size data: otherwise, the thicker plate shall be thinned on one side (as shown in Figure 9) or both sides (as shown in Figure 10), and the thinning length L≥3 (5-,).
Thickness of the spring plate 3,
Difference in thickness of the two plates (5-8)
When the steel is butt-jointed, the misalignment e (see Figure 11) shall comply with the requirements of Table 11. Figure 11
> 9~12
Height of steel h
>180~360
JB/T 7167-93
Misalignment
5.4.6 Structural parts after positioning welding shall be welded only after they have been accepted by the inspection personnel and marked with obvious weldable marks. 6 Welding
6.1 Sealing welding is required when there is no special requirement for welding of structural parts, such as the ends of vertical plates, ribs, partitions, etc. and the gaps at the exposed ends. For welded parts with extra-long or open structures, except for the needs of the solidification process, the welded parts should be framed and leveled. 6.2
6.3 It is prohibited to strike an arc in non-welding areas, nor at the ends of welds. mm
6.4 There should be no oxides, water marks, oil stains, dust and other dirt at the welds of important structural parts and low-alloy high-strength steel and within 15mm on both sides.
6.5 Alkaline low-hydrogen type welding rods must be dried at 350~450℃ for 1~2h before use. After drying, store them in a 100~150℃ insulation cylinder and take them out as needed. The welding rods should be dried quantitatively and the number of repeated dryings should not exceed 2 times. 6.6 New steel grades, new welding rods or welding wires, and new welding processes used for the first time must be tested for reliability before being formally adopted, and can only be formally adopted after being evaluated as feasible.
6.7 When welding general structural parts in the open air, welding is not allowed when the ambient temperature is lower than -5°C, or when there is heavy fog, strong winds above level 5, rain, snow, etc., and corresponding measures should be taken when welding is necessary. 6.8 For medium carbon steel, high carbon steel, alloy structural steel, and low carbon steel larger structural parts with a plate thickness greater than 30mm, preheating, slow cooling after welding, and tempering treatment should be considered before welding. For welded parts that cannot be preheated and tempered, 23-13 series titanium calcium type or low hydrogen type stainless steel welding rods, such as E1-23-13-16 (A302) and E1-23-13-15 (A307), etc. can also be used. 6.9 In case of broken line welds, arc closing or joints should be avoided at the welding corners to prevent stress concentration defects. 7 Requirements after welding
7.1 General requirements
7.1.1 Important welds must be marked with welder marks after welding 7.1.2 When welds require heat treatment, they should be immediately transferred to the heat treatment process after passing the post-weld inspection. 7.1.3 For welds that require slow cooling after welding, the interlayer temperature after welding shall not be less than the preheating temperature. 7.1.4 In addition to necessary corrections, the inspectors should also make a final inspection for welds after tempering and slow cooling, and transfer to the next process after passing the inspection.
7.2 Dimensional deviations and welding defects of welded parts 7.2.1 Weld shape deviations and weld defects shall comply with the provisions of Table 12. 7.2.2 The limit deviations of the length dimensions of welded structural parts 41, t are shown in Figure 12, and their values shall comply with the provisions of Table 13. 7.2.3 The straightness, parallelism and flatness tolerances of welded structural parts shall comply with the relevant provisions of Articles 7.2.3.1 to 7.2.3.3. 7.2.3.1 The straightness tolerance of welded parts shall not exceed 1.5mm within a length of 1000mm, and shall not exceed 1.5% over the entire length. The maximum shall not exceed 8mm (the straightness tolerance of thin plate welded parts less than 3mm can be increased by 1/3 of the original tolerance value). 7.2.3.2 The parallelism tolerance between the surfaces of welded parts shall not exceed half of the corresponding size tolerance. 7.2.3.3 The flatness tolerance of the welding plane shall comply with the provisions of Table 14. 8) does not exceed the requirements of Table 10, the basic type and size of the welded joint shall be made according to the thicker size data: otherwise, the thicker plate shall be thinned on one side (as shown in Figure 9) or both sides (as shown in Figure 10), and the thinning length L≥3 (5-,).
Thickness of the spring plate 3,
Difference in thickness of the two plates (5-8)
When the steel is butt-jointed, the misalignment e (see Figure 11) shall comply with the requirements of Table 11. Figure 11
> 9~12
Height of steel h
>180~360
JB/T 7167-93
Misalignment
5.4.6 Structural parts after positioning welding shall be welded only after they have been accepted by the inspection personnel and marked with obvious weldable marks. 6 Welding
6.1 Sealing welding is required when there is no special requirement for welding of structural parts, such as the ends of vertical plates, ribs, partitions, etc. and the gaps at the exposed ends. For welded parts with extra-long or open structures, except for the needs of the solidification process, the welded parts should be framed and leveled. 6.2
6.3 It is prohibited to strike an arc in non-welding areas, nor at the ends of welds. mm
6.4 There should be no oxides, water marks, oil stains, dust and other dirt at the welds of important structural parts and low-alloy high-strength steel and within 15mm on both sides.
6.5 Alkaline low-hydrogen type welding rods must be dried at 350~450℃ for 1~2h before use. After drying, store them in a 100~150℃ insulation cylinder and take them out as needed. The welding rods should be dried quantitatively and the number of repeated dryings should not exceed 2 times. 6.6 New steel grades, new welding rods or welding wires, and new welding processes used for the first time must be tested for reliability before being formally adopted, and can only be formally adopted after being evaluated as feasible.
6.7 When welding general structural parts in the open air, welding is not allowed when the ambient temperature is lower than -5°C, or when there is heavy fog, strong winds above level 5, rain, snow, etc., and corresponding measures should be taken when welding is necessary. 6.8 For medium carbon steel, high carbon steel, alloy structural steel, and low carbon steel larger structural parts with a plate thickness greater than 30mm, preheating, slow cooling after welding, and tempering treatment should be considered before welding. For welded parts that cannot be preheated and tempered, 23-13 series titanium calcium type or low hydrogen type stainless steel welding rods, such as E1-23-13-16 (A302) and E1-23-13-15 (A307), etc. can also be used. 6.9 In case of broken line welds, arc closing or joints should be avoided at the welding corners to prevent stress concentration defects. 7 Requirements after welding
7.1 General requirements
7.1.1 Important welds must be marked with welder marks after welding 7.1.2 When welds require heat treatment, they should be immediately transferred to the heat treatment process after passing the post-weld inspection. 7.1.3 For welds that require slow cooling after welding, the interlayer temperature after welding shall not be less than the preheating temperature. 7.1.4 In addition to necessary corrections, the inspectors should also make a final inspection for welds after tempering and slow cooling, and transfer to the next process after passing the inspection.
7.2 Dimensional deviations and welding defects of welded parts 7.2.1 Weld shape deviations and weld defects shall comply with the provisions of Table 12. 7.2.2 The limit deviations of the length dimensions of welded structural parts 41, t are shown in Figure 12, and their values shall comply with the provisions of Table 13. 7.2.3 The straightness, parallelism and flatness tolerances of welded structural parts shall comply with the relevant provisions of Articles 7.2.3.1 to 7.2.3.3. 7.2.3.1 The straightness tolerance of welded parts shall not exceed 1.5mm within a length of 1000mm, and shall not exceed 1.5% over the entire length. The maximum shall not exceed 8mm (the straightness tolerance of thin plate welded parts less than 3mm can be increased by 1/3 of the original tolerance value). 7.2.3.2 The parallelism tolerance between the surfaces of welded parts shall not exceed half of the corresponding size tolerance. 7.2.3.3 The flatness tolerance of the welding plane shall comply with the provisions of Table 14. 8
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