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GB 50661-2011 English PDF (GB50661-2011)

GB 50661-2011 English PDF (GB50661-2011)

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GB 50661-2011: Code for welding of steel structures

This Code is formulated with view to implementing national technical and economic policies in the steel structure welding, to achieving technical advancement, economic rationality, safety and usability, and to ensuring quality and energy conservation and environmental protection.
GB 50661-2011
GB
NATIONAL STANDARD OF THE
PEOPLE REPUBLIC OF CHINA
UDC
P GB 50661-2011
Code for Welding of Steel Structures
ISSUED ON. DECEMBER 5, 2011
IMPLEMENTED ON. AUGUST 1, 2012
Issued by. Ministry of Housing and Urban-Rural Development;
General Administration of Quality Supervision, Inspection
and Quarantine (AQSIQ) and the Standardization
Administration (SAC) of the People's Republic of China.
Table of Contents
Foreword ... 6
1 General Provisions ... 8
2 Terms and Symbols ... 9
2.1 Terms ... 9
2.2 Symbols ... 9
3 Basic Requirement ... 11
4 Materials ... 13
5 Design of Welding Connections ... 15
5.1 General Requirements ... 15
5.2 Form and Size of Weld Groove ... 16
5.3 Theoretical Throat of Weld ... 18
5.4 Welding Nodal Points of Combined Welding Member ... 27
5.5 Technics for Avoiding the Nodal Point of Lamellar Tearing ... 30
5.6 Welding Connection Design of Member Production and Field Installation ... 32 5.7 Design of Welding Connections Bearing Dynamic Load and Anti-earthquake ... 38 6 Welding Procedure Qualification ... 41
6.1 General Requirement ... 41
6.2 Substitute Principles of Welding Procedure Qualification ... 43
6.3 Requalification ... 46
6.4 Preparation of Test Pieces and Samples ... 48
6.5 Testing ... 56
6.6 Prequalification of WPS ... 60
7 Welding Procedures ... 64
7.1 Preparation of Base Metal ... 64
7.2 Requirement of Welding Consumables ... 65
7.3 Assemble Requirement of Welding Joint ... 67
7.4 Tack Weld ... 68
7.5 Welding Environment ... 68
7.6 Preheat and Interpass Temperature Control ... 68
7.7 Post-weld Hydrogen Relief Heat Treatment ... 70
7.8 Post-weld Stress Relief Treatment ... 70
7.9 Weld Tab and Backing ... 70
7.10 Technic Requirement of Welding Procedure ... 71
7.11 Control of Welding Deformation ... 72
7.12 Repairs ... 73
7.13 Correction ... 74
7.14 Back Gouging ... 74
7.15 Temporary Welds ... 74
7.16 Striking and Extinguish of Arc ... 75
7.17 ESW and EGW ... 75
8 Inspection ... 76
8.1 General Requirement ... 76
8.2 Weld Inspection of Structure Bearing Static Load ... 79
8.3 Weld Inspection of Structure Requiring Fatigue Assessment ... 82
9 Weld Strengthening and Reinforcement ... 86
Appendix A Form, Size and Marking Method for Welding Joint Groove of Steel Structure ... 89
Appendix B Format of WPQR ... 100
Appendix C Testing of ESW Weld of Box Members ... 119
Explanation of Wording in This Code ... 120
List of Quoted Standards ... 121
Foreword
This code was jointly prepared by the Central Research Institute of Building and Construction of MCC Group Co., Ltd. and organizations concerned according to the requirements of the Ministry of Construction "Notice on Printing and Publishing 'Development and Revision Plan of National Engineering Construction Standards and Codes (second batch) in 2005' " (Jianbiao [2007] No.126).
This code provides the technical requirements on design of welding connections, manufacture, materials, procedure and quality control of steel structures as well as staffing. Meanwhile, in order to implement technical and economic policies of the nation and reflect the sustainable development concept in the steel structure construction field, this code not only controls the welding quality of steel structures, but also strengthen the requirements on energy conservation, material saving and environmental protection, etc.
During the preparation process this code, we summarized the practical
experience and research achievements on steel structure welding in China in recent years, the drafting group conducted multiple monographic studies, sufficiently adopted the new technology, new procedure and new materials practically used in works, and used the international and foreign advanced standards for reference, solicited opinions from all sides, discussed and modified the specific contents repeatedly and finalizes it upon review.
The main contents of this code are. General Provisions, Terms and Symbols, Basic Requirement, Materials, Design of Welding Connections, Welding Procedure Qualification, Welding Procedures, Inspection, Weld Strengthening and
Reinforcement, etc.
Provisions printed in bold type in this code are compulsory ones, and must be enforced strictly.
The Ministry of Housing and Urban-Rural Development is in charge of the administration of this standard and the explanation of the compulsory provisions of this code, and Central Research Institute of Building and Construction of MCC Group Co., Ltd. is in charge of the explanation of specific technical contents. All relevant organizations are kindly requested to sum up and accumulate your experiences in actual practice during the process of implementing this code. The relevant opinions and advice, whenever necessary, can be fed back to "Code for Construction of Concrete Structures" Administrative Group of Central Research Institute of Building and Construction of MCC Group Co., Ltd. (Address. No.33, Xitucheng Road, Haidian District, Beijing, 100088; E-mail. jyz3408@263.net) for future reference. Chief development organizations of this code. Central Research Institute of Building and Construction of MCC Group Co., Ltd. and China Second Metallurgy Group Corporation Limited
Participating development organizations. National Engineering Research Center for Steel Structures, China Jingye Engineering Corporation Limited, China 1 General Provisions
1.0.1 This code is formulated with view to implementing national technical and economic policies in the steel structure welding, to achieving technical advancement, economic ...

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