1 General Provisions
1.0.1 This Code was formulated with a view to improving the construction level of welding engineering for equipments in construction site of engineering construction and the industrial metallic pipeline, strengthening the quality control in construction process of welding engineering, and guaranteeing the engineering quality and engineering safety.
1.0.2 This Code is applicable to the welding engineering construction of the materials made of carbon steel, aluminium and aluminium alloy, copper and copper alloy, titanium and titanium alloy (low alloy titanium), nickel and nickel alloy as well as zirconium and zirconium alloy.
1.0.3 The welding methods applicable to this Code include gas welding, shielded metal arc welding, submerged arc welding, tungsten inert gas arc welding, metal inert gas arc welding, self-shielded flux cored arc welding, electroslag welding and stud welding.
1.0.4 The welding engineering construction shall be carried out according to the requirements of the design document and this Code.
1.0.5 Where the design document needs be modified or the material needs be substituted, it shall be approved by the original design organization and issued with written document.
1.0.6 This Code shall apply in conjunction with the current national standard "Code for Construction and Acceptance of Field Equipment, Industrial Pipe Welding Engineering" (GB 50683).
1.0.7 The welding engineering construction shall meet the relevant requirements of the relevant current national standards on energy conservation and emission reduction, environmental protection, safety technology as well as labour protection, etc.
1.0.8 The construction of field equipment, industrial pipe welding engineering shall not only in accordance with this Code, but also comply with the requirements specified in the current relevant standards of the nation.
2 Terms
2.0.1 Field equipment
It refers to the equipment manufactured or installed in construction site of engineering construction.
2.0.2 Welding responsible personnel
The personnel obtaining the required professional knowledge of welding by training, education or practice, being qualified with his capacity and designated to take responsibility of welding and relevant manufacture activities.
2.0.3 Welding procedure specification
It refers to the document of technicals formulated, according to welding procedure qualification report, in combination with practical experience for directly instructing the welding engineering, it specifies in detail of the contents such as welded joint, base metal, welding material, welding position, preheating, electrical characteristic and operating technique, so as to guarantee the reproducibility of welding quality.
2.0.4 Welding procedure pre-specification
The welding procedure specification in need of qualification.
2.0.5 Welding procedure qualification
The process of preparing test piece and test specimen, conducting the test and assessing the result according to welding procedure pre-specification.
2.0.6 Welding procedure qualification report
The document recording the relevant test data and test result during the process of welding procedure qualification.
2.0.7 Welding skill qualification
The process to assess and examine the operating skill of welding operation personnel.
2.0.8 Interpass temperature
The transient temperature of multi-pass weld and adjacent base metal before welding the next weld pass.
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3 Basic Requirements
3.0.1 The requirements of welding technical specification shall be specified in design document.
3.0.2 The qualifications and responsibilities of welding responsible personnel and welding operation personnel shall meet the following requirements:
1 Welding technical personnel shall have a professional educational background of technical secondary school or above, with more than one year’s welding operation practice. Welding technical personnel shall be responsible for the welding procedure qualification, develop welding procedure specification and welding technical measures, carry out welding technology and safety disclosure, instruct on the welding operation, participate in the welding quality management, handle welding technical problems and arrange welding technical data.
2 Welding inspection personnel shall have an theoretical knowledge level equivalent to that for technical secondary school or above, with certain welding experience. Welding inspection personnel shall conduct overall inspection on field welding operation and control it, be responsible for determining the weld locations for inspection, qualify the welding quality, issue inspection documents and participate in the examination and approval of welding technical measures.
3 The management personnel for welding materials shall have elementary knowledge of relevant welding materials and shall be responsible of the welding materials for warehouse entry acceptance, preservation, stoving, distributing and recycling, etc.
4 Non-destructive testing personnel shall be those who have been tested and qualified by professional testing institutions with the state's authorization, and shall take the responsibility of inspection, examination and verification according to the qualified examination item and authority item. Non-destructive testing personnel shall carry out the inspection according to the locations to be inspected determined by welding quality inspection personnel, qualify the weld quality, sign and issue inspection reports, and refuse to inspect the weld which visually do not conform to the inspection requirements.
5 The welder shall have the quality certificate of welding skill qualification in accordance with the requirements specified in Chapter 6 of this Code and corresponding capability. The welder shall conduct the welding according to the specified welding procedure specification and welding technical measures, where the operation condition do not conform to the requirements of welding procedure specification and welding technical measures, the welder shall refuse to carry out welding.
1 General Provisions
2 Terms
3 Basic Requirements
4 Materials
5 Welding Procedure Qualification
6 Welding Skill Qualification
7 Welding of Carbon Steel and Alloy Steel
7.1 General Requirements
7.2 Preparation before Welding
7.3 Requirements of Welding Procedure
7.4 Weld Preheating and Post-weld Heat Treatment
8 Welding of Aluminium and Aluminium Alloy
8.1 General Requirements
8.2 Preparation before Welding
8.3 Requirements of Welding Procedure
9 Welding of Copper and Copper Alloy
9.1 General Requirements
9.2 Preparation before Welding
9.3 Requirements of Welding Procedure
10 Welding of Titanium and Titanium Alloy
10.1 General Requirements
10.2 Preparation before Welding
10.3 Requirements of Welding Procedure
11 Welding of Nickel and Nickel Alloy
11.1 General Requirements
11.2 Preparation before Welding
11.3 Requirements of Welding Procedure
12 Welding of Zirconium and Zirconium Alloy
12.1 General Requirements
12.2 Preparation before Welding
12.3 Requirements of Welding Procedure
13.1 Inspection before Welding
13.2 Inspection in the Mid of Welding
13.3 Inspection after Welding
13.4 Hand over of Welding Engineering
Appendix A Welding Procedure Specification Form
Appendix B Welding Performance Qualification Record, Welding Performance Qualification Result Form and Welding Performance Certification Form
Appendix C Type and Size of Welding Groove for Common Use
Appendix D Selection of Welding Materials
Explanation of Wording in This Code
List of Quoted Standards
