JGJ 81-1991 Welding Code for Building Steel Structures JGJ81-91 JGJ81-1991 Standard download decompression password: www.bzxz.net

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National Standard of the People's Republic of China
Code for Welding of Building Steel Structures
JGJ81-91
1992 Beijing
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Industry Standard of the People's Republic of China
Code for Welding of Building Steel Structures
JGJ81-91
Editor: Hubei Provincial Construction Engineering Corporation Approval Department: Construction Industry of the People's Republic of China Implementation Date: September 1, 1992
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Notice on the Release of the Industry Standard "Code for Welding of Building Steel Structures"
Construction Standards [1992] No. 78
According to the requirements of the former State Construction Engineering Bureau (82) Construction Engineering Science No. 14 document, the "Code for Welding of Building Steel Structures" edited by Hubei Provincial Construction Engineering Corporation has been reviewed and approved as an industry standard, with the number JGJ81-91, and will be implemented on September 1, 1992
This standard is managed by the China Academy of Building Research, the technical unit responsible for construction engineering standards of the Ministry of Construction, and is interpreted by Hubei Provincial Construction Engineering Corporation. It is organized and published by the Standard and Quota Research Institute of the Ministry of Construction.
Ministry of Construction of the People's Republic of China
February 20, 1992
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Chapter 1 General
Steel and Welding Materials
Chapter 3 Welding Structure and Joint Design
Welding Process
Chapter 4
Section 1
Section 2
Section 3
Section 4
Section 5
Section 5
Section 6
Chapter 5| |tt||Chapter 6
General requirements
Manual arc welding
Submerged arc welding
Carbon dioxide gas shielded arc welding
Flux-cored wire welding
Tubular electrode wire electrode electroslag welding
Plug welding and slot welding
Welding procedure test
Welding inspection
Section 1
General provisions
Appearance inspection
Section 2
Section 3
Non-destructive testing
(34)
Chapter 7. Welding reinforcement or reinforcement of steel structure... Section 8
Welder Examination
Section 2 General Provisions for Welder Examination
Section 3 Contents and Methods of Welder Operation Skills Examination Section 3
Evaluation Standards for Test Piece Welds
Section 4 Examination Results Record
Appendix 1 Basic Types and Dimensions of Manual Arc Welding Joints Basic Types and Dimensions of Submerged Arc Welding Joints Appendix 2
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Appendix 3 Oxygen and acetylene cutting process parameters
Appendix 4 Oxygen and propane cutting process parameters
Appendix 5
Reference values ​​for welding anti-deformation·
Appendix 6 Welding shrinkage allowance
Appendix 7 Automatic protection flux-cored welding wire models, specifications and welding parameters.
Appendix 8
Ultrasonic detection of fillet welds and T-welds
Operation method
Appendix 9
Appendix 10
Appendix 10
Magnetic particle testing technology
Penetrant testing test method
Welder examination registration form
Appendix 12
Appendix 14
Appendix 1
Appendix 17
Additional instructions
Welder examination record form·
Welder qualification certificate
Term comparison
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·(71)
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Conversion between illegal measurement units and legal measurement units (88) Explanation of terms used in this code
2 Standard full text information system
（89）
（90）
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Chapter 1 General
Article 1.0.1 This code is formulated to implement the national technical and economic reform policy in the welding of building steel structures, to achieve advanced technology, economic rationality, safety and applicability, and to ensure quality.
Article 1.0.2 This code applies to the welding of ordinary carbon structural steel and low-alloy structural steel in industrial and civil building steel structures. Article 1.0.3 The welding of steel structures can adopt the following welding methods: manual arc welding; automatic and semi-automatic submerged arc welding; gas shielded welding, punching and electroslag welding. Article 1.0.4 The welding of steel structures must be carried out according to the requirements of the construction drawings and shall comply with the provisions of the current "Code for Construction and Acceptance of Steel Structure Engineering" (GBJ205). Article 1.0.5 The welding of steel structures must comply with the current national safety technology and labor protection regulations. Article 1.0.6 In addition to implementing this code, the welding of steel structures shall also comply with the current national standards.
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Chapter 2 Steel and Welding Materials
Article 2.0.1 Steel and welding materials shall be selected according to the requirements of the construction drawings. Their performance and quality must comply with the provisions of national standards and industry standards, and they shall have quality certificates or inspection reports. If other steel and welding materials are used as replacements, they must be approved by the design unit, and reliable test data and corresponding process documents shall be available before welding.
Article 2.0.2 The selection and strength grade of welding rods, welding wires and fluxes required for welding of commonly used steels should be selected according to the provisions of Table 2.0.2-1 and Table 2.0.22. Selection of welding rods for commonly used steels
Technical conditions of steel
Tensile strengthYield strength
f(MPa)f(MPa)
16MnCu
14MnNb
15MnTi
370~460
370~460
470510
470~490
Electrode model
Electrode metal requirements
Table 2.0.2—1||t t||Yield strength elongation
Tensile strength
f(MPa)
85（%)
Structural
Structural
Note: The tensile and yield strength of steel materials are converted from kgf/mm2 to MPa as 1kgt/mm2=9.8MPa Engineering Construction Standard Full Text Information System
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Selection of welding wire and flux
16MnCu||tt| |Flux and welding wire for submerged arc welding
HJ401—H08
HJ401—H08A
HJ402-—H08A
HJ402—H08MnA
14MnNbHJ402-H10Mn2
15MnTi
HJ402-—H08MnA
HJ402—H10Mn2
HJ402—H08MnMoA
CO2 gas protection Welding wire for protective welding
H08Mn2Si
H08Mn2Si
H10MnSiMo
H08Mn2Si
H10Mn2
H10MnSiMo
Table 2.0.2-2
H08A is only used for structural welds
or to meet the force requirements
Article 2.0.3 Other steel grades with carbon equivalent Ceu less than or equal to 0.45% can be welded according to the provisions of this specification. Carbon equivalent Ceu is calculated according to formula (2.0.3). C+Mn+1
(Cr+Mn+V)+
Carbon content (%);
Manganese content (%):
Nickel content (%);
Molybdenum content (%);
Cu-Copper content (%);
Chromium content (%)
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(Ni+C)
.3
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Chapter 3 Welding Structure and Joint Design
Section 3.0.1. The design of steel structure welding structure shall meet the following requirements: 1. Reduce the amount of work on parts and components; 2. Facilitate welding operation, and it is advisable to use flat welding or horizontal welding positions; 3. The arrangement of welds should be symmetrical to the neutral axis of the component cross section. Contact spot welding should be used in thin-walled structures, and slot welding or plug welding should be added between side welds to reduce welding deformation; 4. Use joints with lower rigidity to avoid dense welds and intersection of three-way welds to reduce welding stress and stress concentration; 5. For thicker plates (greater than 25mm), measures to prevent lamellar tearing should be taken in T-joints, corner joints and cross joints: 1. Minimize the number and size of welds as much as possible. The weld length and weld leg size should be determined by calculation and shall not be increased at will.
Article 3.0.2 The following types of welded joints should be used: 1. Butt joints, 2. Lap joints, 3. T-joints, 4. Corner joints, 5. Slot welds and plug welds, 6. Contact spot welds.
Article 3.0.3 The basic types and sizes of manual welded joints should be selected according to Appendix 1. The basic types and sizes of submerged arc welded joints should be selected according to Appendix 2. Article 3.0.4 The allowable thickness difference (ti-t2) for butt joints of steel plates of different thicknesses is shown in Table 3.0.4. When the thickness exceeds the requirements of Table 3.0.4, one or both sides of the thicker plate should be processed into a slope, and the slope should be less than or equal to 1:4, see Figure 3.0.4. Engineering Construction Standards Full Text Information System
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Allowable thickness difference of butt joint of steels of different thicknessThickness of thinner steel plate t2 (mm)
Allowable thickness difference
(t1—t2)(mm)
≤1:4
≤1:4
(α)Figure 3.0.4 Schematic diagram of butt joint structure of steel plates of different thicknessArticle 3.0.5 Butt weld.
Butt welds requiring full penetration shall be welded with back-end root cleaning or single-sided welding with pads.
Butt welds with incomplete penetration (Figure 3.0.5a, d) shall be calculated as fillet welds with effective thickness h. For:
V-type groove (Figure 3.0.5a, b, c):
When α>600, h, —8
When a<60°, h. =0.75s.
U-type groove (Figure 3.0.5d, e):
h. =8
The shortest distance from the root of the groove to the surface of the weld (ignoring the excess height); a V-type groove angle.
Main, weld excess height c, generally within the range of 0 to 3mm, for welds subjected to dynamic loads, the excess height should be close to zero
Article 3.0.6 Determination of effective weld thickness:, for fully penetrated butt welds, when the strength is required to be equal to that of the parent material, h. =s, the excess height is not calculated; for butt welds that are not fully penetrated, the effective thickness shall be taken in accordance with the provisions of Article 3.0.5
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(a>V-shaped groove
(d>U-shaped joint groove
(b)V-shaped groove
(e>V-shaped groove
(e)U-shaped joint groove
Figure 3.0.5 Schematic diagram of cross-section of welds that are not fully penetrated
, bevel fillet weld (Figure 3.0.6).
When>90° (Figure 3.0.6a):
h.=hy · cos number
When 90° (Figure 3.0.6b):
The angle between the two weld legs;
The size of the weld leg.
Article 3.0.7 The effective thickness (h2) of the weld between round steel and flat plate, and between round steel and round steel shall be calculated as follows: Round steel and flat plate connection (Figure 3.0.7α): h2 = 0.7hf
Round steel and round steel connection (Figure 3.0.76)
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h2 = 0.1(d1+2d2)
Where d is the diameter of a large round steel bar (mm);
d2 is the diameter of a small round steel bar (mm);
The distance from the surface of a weld to the common tangent line of two round steel bars. (a)
Figure 3.0.6 Schematic diagram of the cross section of a fillet weld
Article 3.0.8 For butt joints that bear dynamic loads and require the weld to be as strong as the parent material, the butt welds in the longitudinal and transverse directions may adopt a cross or T-shaped cross. When it is a T-shaped cross, the distance between the intersection points shall not be less than 200mm, and the length and width of the splicing material shall not be less than 300mm (Figure 3.0.8). If there are special requirements, the position of the head weld should be indicated.
Article 3.0.9 The connection structure between the rods and the node plates of the trusses and supports should adopt the type shown in Figure 3.0.9.
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.bzsoso.Com7α): h. = 0.7hf
Round steel and round steel connection (Figure 3. 0.76)
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h. = 0. 1(d1+2d2)
Where d—diameter of a large round steel (mm);
d2—diameter of a small round steel (mm);
The distance from the surface of a weld to the common tangent line of two round steels. (a)
Figure 3.0.6 Schematic diagram of the cross section of a fillet weld
Article 3.0.8 For butt joints subjected to dynamic loads and requiring the weld to be as strong as the parent material, the butt welds in the longitudinal and transverse directions may adopt a cross or T-shaped cross. When it is a T-shaped fork, the distance between the intersections shall not be less than 200mm, and the length and width of the splicing material shall not be less than 300mm (Figure 3.0.8). If there are special requirements, the position of the head weld should be indicated.
Article 3.0.9 The connection structure between the truss and supporting rods and the node plate should adopt the type of Figure 3.0.9.
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.bzsoso.Com7α): h. = 0.7hf
Round steel and round steel connection (Figure 3. 0.76)
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h. = 0. 1(d1+2d2)
Where d—diameter of a large round steel (mm);
d2—diameter of a small round steel (mm);
The distance from the surface of a weld to the common tangent line of two round steels. (a)
Figure 3.0.6 Schematic diagram of the cross section of a fillet weld
Article 3.0.8 For butt joints subjected to dynamic loads and requiring the weld to be as strong as the parent material, the butt welds in the longitudinal and transverse directions may adopt a cross or T-shaped cross. When it is a T-shaped fork, the distance between the intersections shall not be less than 200mm, and the length and width of the splicing material shall not be less than 300mm (Figure 3.0.8). If there are special requirements, the position of the head weld should be indicated.
Article 3.0.9 The connection structure between the truss and supporting rods and the node plate should adopt the type of Figure 3.0.9.
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