JGJ81-2002 PDF English
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Technical specification for welding of steel structure of building
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Technical Specification for Welding of Steel Structure of Building
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JGJ81-2002: Technical specification for welding of steel structure of building---This is an excerpt. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.), auto-downloaded/delivered in 9 seconds, can be purchased online: https://www.ChineseStandard.net/PDF.aspx/JGJ81-2002
OF THE PEOPLE'S REPUBLIC OF CHINA
Technical specification for Welding of steel
structure of building
2002 Beijing
Announcement of Ministry of Construction of
the People· s Republic of China
JB No. 62
Announcement "Technical specification for Welding of steel
structure of building" for the Professional standard
published the Ministry construction
Approving"Technical specification for Welding of steel structure of building"to be
used for the Professional standard, the serial number is JGJ 81-2002, which is carried
out from January 1, 2003. It is forcing articles for the 3. 0. 1, 4. 4. 2, 5. 1. 1, 7. 1. 5,
7. 3. 3 (1) (2), which must be carried out strictly; at the same time, abolish primitive
Professional standard (Technical specification for Welding of steel structure of building)
(JGJ 81-91).
This specification is issued by China Architecture &. Building Press which organized
by the standard and quota institute of Ministry construction.
Ministry of Construction of the People· s Republic of China
September 27, 2002
Forward
Based on the demand of Building standard [1999] 309 for the Ministry construc-
tion, the team of establishing the specification, revised (Technical specification for
Welding of steel structure of building) CJGJ 81-91) overall and work out this specifica-
tion, undergo widely investigate and research, sum up seriously practical experience,
refer to related international standard and abroad advanced standard, and based on wide-
ly ask for the suggestion.
It is main technical content that 1 general ; 2 basic rule; 3 materials; 4 the struc-
ture of welding node; 5 welding procedure qualification; 6 welding process; 7 inspection
of welding quality; 8 weld reinforcement and consolidation; 9 welder examination.
It is revised that the main technical content.
The first chapter general, expand applicable range, confirm the plate thickness
lower limit, type and applicable welding method for the steel structure of building.
The second chapter basic rule is new addition. It definitely stipulate the principle to
differentiate difficult and easy of welding work for steel structure of building, qualifica-
tion of manufacture and assemble unit, duty and qualification of relative persons and
quality assurance system.
The third chapter materials, cancel the selective assemble table of general steel and
welding electrode, welding wire, welding flux and the limit of carbon equivalent of the
steel; add to reexamination of steel and welding material, national standard of welding
material and gases, performance request of the thickness of steel plate.
The fourth chapter structure of welding node, add to the shape and size of welding
groove for different welding process, various joint type and groove requirement of tubu-
lar structure, the node form against lamellar tearing of steel plate, the welding node
form of component making and installing on building site, the welding node form for
bearing dynamic load and against earthquake, general definition for welding node of as-
sembly welding, and revise the calculation thickness of welded seam.
The fifth chapter welding procedure qualification, which is overall expanded for.the
qualification rule of welding procedure, manufacture of test piece arid sample, test and
examination, and added to general definition of welding procedure qualifcation and defi-
nition of renewing welding procedure qualication.
The sixth chapter welding process, cancel parameter referencing table for various
welding methods, add to general definition of welding process, matching sample of vari-
ous welding methods and welding material, and the requirement for preheating, posthe-
• 1 •
at and stress relief after welding, and process step against lamellar tear and controlling
welding deformation.
The se'venth chapter inspection of welding quality, it is revised that the visual qual-
ified standard of welded seam, the permissible deviation of outline dimension for various
shape welded seam, and the requirement of non-destructive testing, added ·to dividing
definition of welding inspection group, ultrasonic testing method and criterion of defect
classification for welded seam of circular tube T, K, Y node, and ultrasonic testing
method of penetration width of electroslag welding seam for baffle of box-form compo-
nents.
The eighth chapter weld reinforcement and consolidation, is revised and added to
the method of weld reinforcement and consolidation for steel structure, added to calcula-
tion method of steel strength when steel structure corrupted for gas phase, the defini-
tion of reinforcement and consolidation for welded seam under load, the definition of ra-
tio ~ for nominal stress of component bear dynamic load and design value of steel
strength, the local property decrease of component and corresponding security meas'ures
as well as reduction coefficient of welded seam strength. considering welding instantane-
ous heating.
The ninth chapter welder examination, is revised for content and classify of exami-
nation, for hand operating ability, add to addition examination and locating weld exami-
nation. about hand operating ability.
This specification is managed and is explained to forcing articles for Ministry con-
struction, and is explained to specific technical content for chief edition unit.
The chief edition unit is. Building research institute of group for metallurgical in
China ( address. west TuCheng road 33, HaiDian district, Beijing; postal code.
100088)
Chief Development Organization.
• 2 •
China construction first office steel structure engineering Ltd.
Bao steel Co. ,Ltd.
Chongqing steel design and research institute
Beijing steel design and research institute
Wuhan steel group metal structure Co. , Ltd.
Jiangnan heavy industry group Co. , Ltd.
Dalian heavy industry group Co. ,Ltd.
Shengzheng Jiansheng and steel structure building and installing engineering
Co., Ltd.
Shanghai Bao steel metallurgical construction company
China twentieth metallurgical construction company steel· structure manufac-
Table of Contents
1 General ... ( 1 )
2 Basic rule ...• ... ( 2
3 Materials ... ( 5
4 The structure of welding node ... , ... ( 7 )
4. 1 General ... ( 7 )
4. 2 The form and size of welding groove ... ( 7 )
4. 3 Welding seam calculation thickness ... ( 2 4)
4. 4 Combined welding component welding point ... ( 3 3)
4. 5 Nodal form against plate to generate lamellar tear ... ( 3 6)
4. 6 Component manufacture and field installing welded nodal point form ... ( 3 8)
4. 7 Bear dynamic load and anti-earthquake welding joint form ... ( 4 5)
5 Welding Procedure Qualification ... ( 4 9)
5. 1 General ... ( 4 9)
5. 2 The evaluation rule of the welding procedure qualification ... ( 5 2)
5. 3 Specification of re-assesses the welding procedure ... ( 5 4)
5. 4 Preparation of test piece and sample ... ( 5 7)
5. 5 Test and examination for test piece and test specimen ... ( 6 4)
6 Welding Process ... ( 6 8)
6. 1 General ... ( 6 8)
6. 2 Welding Preheating and Post-Heating ... ( 7 5)
6. 3 The technology measure preventing lamellar tearing ... ( 7 7)
6. 4 Process Measures for Welding Distortion Control ... ( 7 8)
6. 5 Post-Weld Stress Relief Treatment ... ( 7 8)
6. 6 Repaired of Fusion Weld Seam Defects ... ( 7 9)
7 Welding Quality Inspection ... ( 8 1 )
7. 1 General ... C 8 1 )
7, 2 Visual Inspection ... ( 8 2.)
7. 3 Nondestructive Test ... C 8 4)
8 Welding Reinforcement and Consolidation ... ( B 7)
9 Welder Examinations ... C 9 2)
9. 1 General prescriptions ... '... C 9 2 )
9. 2...
......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
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