GB 50236-2011 Code for construction of field equipment,industrial pipe welding engineering
1 General provisions
1.0.1 This code is formulated with a view to improving the construction level of welding engineering for equipment in construction site of engineering construction and the industrial metallic pipeline, strengthening the quality control in construction process of welding engineering, and ensuring 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, aluminum and aluminum 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 must be approved by the original design organization and issued with written document.
1.0.6 This code shall be used 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 labor protection, etc.
1.0.8 The construction of field equipment, industrial pipe welding engineering shall not only be in accordance with this code, but also comply with the requirements of the current relevant standards of the nation.
2 Terms
2.0.1 field equipment
equipment manufactured or installed in engineering construction site
2.0.2 welding responsible personnel
personnel obtaining the required professional knowledge of welding by training, education or practice, with his capability approved and designated to take responsibility of welding and relevant manufacture activities
2.0.3 welding procedure specification
technical document formulated according to welding procedure qualification report in combination with practical experience for directly instructing the welding engineering, it details the contents such as welded joint, base metal, welding material, welding position, preheating, electrical characteristic and operating technique, so as to ensure the reproducibility of welding quality
2.0.4 welding procedure pre-specification
welding procedure specification to be qualifed
2.0.5 welding procedure qualification
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
document recording the relevant test data and test result during welding procedure qualification
2.0.7 welding skill qualification
process to assess and examine the operating skill of welding operation personnel
2.0.8 interpass temperature
transient temperature of multi-pass weld and adjacent base metal before welding the next weld pass
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, developing welding procedure specification and welding technical measures, carrying out welding technology and safety disclosure, instructing on the welding operation, participating in the welding quality management, handling welding technical problems and arranging welding technical data.
2 Welding inspection personnel shall have a 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 pass the test and qualification 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 fails to conform to the inspection requirements.
5 The welder shall have the quality certificate of welding skill qualification in accordance with the requirements specified in Clause 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.
6 The welding heat treatment personnel shall be subjected to a professional training and shall conduct the heat treatment on welds in accordance with standard specifications, operation instructions for heat treatment and design documents.
3.0.3 The supervision organization and general contracting organization shall be equipped with welding responsible personnel.
3.0.4 The construction organization shall meet the following conditions:
1 The construction organization shall establish the management system for welding quality and control the welding activities. The relevant personnel specified in 3.0.2 in this code shall be equipped in construction organization.
2 The welding fixtures, welding heat treatment facilities as well as testing and inspection measures shall meet the technical requirements of the corresponding welding engineering items.
3 Before welding skill qualification and welding in engineering, the construction organization shall be provided with welding procedure qualification with corresponding items.
3.0.5 Welding environment shall meet the following requirements:
1 The welding ambient temperature shall meet the temperature required by weldment welding without influencing the operating skill of welder.
2 The wind velocity while welding shall meet the following requirements:
1) The wind velocity for shielded metal arc welding, self-shielded flux cored arc welding and gas welding shall not be greater than 8m/s.
2) The wind velocity for tungsten inert gas arc welding and metal inert gas arc welding shall not be greater than 2m/s.
3 The relative humidity within 1m away from the welding arc shall meet the following requirements:
1) The relative humidity for aluminum and aluminum alloy welding shall not be greater than 80%.
2) The relative humidity for welding of other materials shall not be greater than 90%.
4 The protective measures shall be taken for welding in rain and snow weather.
3.0.6 Repair of unqualified weld shall meet the following requirements:
1 For weld in need of welding repair, the defect cause shall be analyzed, and the procedure document for welding repair shall be prepared.
2 The defects shall be cleared up before repairing, and the non-destructive testing may be adopted to confirm it if necessary.
3 The shape and dimension of groove at repaired part of welding shall avoid welding defect and be convenient for welding operation.
4 If it is required to preheat, the preheating temperature shall be properly raised comparing with the original weld.
5 Repairing on the same part of the weld should not be conducted for more than twice.
3.0.7 Before engineering welding, the fixtures for welding and heat treatment shall be inspected and calibrated, their operating performance shall be confirmed to be stable and secure. The measuring instruments and equipment for inspection and test shall be in validity period for verification or calibration.
3.0.8 The welding for stainless steel and non-ferrous metal shall be arranged in special site and be equipped with special assembly welding fixture, it shall not be messed up with other products such as ferrous metal. The workplace of welding for stainless steel and non-ferrous metal shall be clean, dry and free of pollution.
4 Materials
4.0.1 The base metal adopted in welding engineering shall be provided with quality assurance documents of manufactory and shall meet the requirements of the current national standard and design document.
4.0.2 Prior to use the base metal, it shall be subjected to inspection and acceptance in accordance with the requirements of the current relevant standard of the nation and design document, its mark shall be clear and complete and shall be able to trace back to the product quality assurance document.
4.0.3 The welding materials shall meet the requirements of design document and those specified as follows:
1 The welding materials shall be provided with quality assurance document issued by manufactory.
2 The carbon steel and alloy steel electrode, welding wire as well as welding flux shall respectively meet the requirements of the current standards of the Nation "Carbon steel covered electrodes" (GB/T 5117), "Low alloy steel covered electrodes" (GB/T 5118), "Stainless steel covered electrodes" (GB/T 983), "Wire rods for welding" (GB/T 3429), "Stainless steel wire rods for welding" (GB/T 4241), "Steel wires for melt welding" (GB/T 14957), "Welding electrodes and rods for gas shielding arc welding of carbon and low alloy steel" (GB/T 8110), "Stainless steel rods and wires for inert-gas shield welding" (YB/T 5091), "Carbon steel electrodes and fluxs for submerged arc welding" (GB/T 5293), "Low alloy steel electrodes and fluxs for submerged arc welding" (GB/T 12470), "Stainless steel electrodes and fluxs for submerged arc welding" (GB/T 17854), "Carbon steel flux cored electrodes for arc welding" (GB/T 10045), "Low alloy steel flux cored electrodes for arc welding" (GB/T 17493) and "Stainless steel flux cored wires" (GB/T 17853).
3 The aluminum and aluminum alloy welding wires shall meet the requirements of the current national standard "Aluminum and aluminum alloy wires and rods" (GB/T 10858).
4 The copper and copper alloy welding wires shall meet the requirements of the current national standard "Copper and copper alloy wires and rods" (GB/T 9460).
5 The titanium and titanium alloy welding wire shall meet the requirements of the current national standards "Titanium and titanium alloy wire" (GB/T 3623) and "Technical permission of welding materials for pressure equipment - Section 7: Titanium and titanium-alloy welding electrodes and rods" (NB/T 47018.7).
6 The nickel and nickel alloy welding rods and wires shall respectively meet the requirements of the current national standards "Nickel and nickel alloy covered welding electrodes" (GB/T 13814) and "Nickel and nickel alloy wires and rods" (GB/T 15620).
7 The male pin and ceramic ring shall meet the requirements of the current national standard "Cheese head studs for arc stud welding" (GB/T 10433).
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
GB 50236-2011 Code for construction of field equipment,industrial pipe welding engineering
1 General provisions
1.0.1 This code is formulated with a view to improving the construction level of welding engineering for equipment in construction site of engineering construction and the industrial metallic pipeline, strengthening the quality control in construction process of welding engineering, and ensuring 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, aluminum and aluminum 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 must be approved by the original design organization and issued with written document.
1.0.6 This code shall be used 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 labor protection, etc.
1.0.8 The construction of field equipment, industrial pipe welding engineering shall not only be in accordance with this code, but also comply with the requirements of the current relevant standards of the nation.
2 Terms
2.0.1 field equipment
equipment manufactured or installed in engineering construction site
2.0.2 welding responsible personnel
personnel obtaining the required professional knowledge of welding by training, education or practice, with his capability approved and designated to take responsibility of welding and relevant manufacture activities
2.0.3 welding procedure specification
technical document formulated according to welding procedure qualification report in combination with practical experience for directly instructing the welding engineering, it details the contents such as welded joint, base metal, welding material, welding position, preheating, electrical characteristic and operating technique, so as to ensure the reproducibility of welding quality
2.0.4 welding procedure pre-specification
welding procedure specification to be qualifed
2.0.5 welding procedure qualification
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
document recording the relevant test data and test result during welding procedure qualification
2.0.7 welding skill qualification
process to assess and examine the operating skill of welding operation personnel
2.0.8 interpass temperature
transient temperature of multi-pass weld and adjacent base metal before welding the next weld pass
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, developing welding procedure specification and welding technical measures, carrying out welding technology and safety disclosure, instructing on the welding operation, participating in the welding quality management, handling welding technical problems and arranging welding technical data.
2 Welding inspection personnel shall have a 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 pass the test and qualification 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 fails to conform to the inspection requirements.
5 The welder shall have the quality certificate of welding skill qualification in accordance with the requirements specified in Clause 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.
6 The welding heat treatment personnel shall be subjected to a professional training and shall conduct the heat treatment on welds in accordance with standard specifications, operation instructions for heat treatment and design documents.
3.0.3 The supervision organization and general contracting organization shall be equipped with welding responsible personnel.
3.0.4 The construction organization shall meet the following conditions:
1 The construction organization shall establish the management system for welding quality and control the welding activities. The relevant personnel specified in 3.0.2 in this code shall be equipped in construction organization.
2 The welding fixtures, welding heat treatment facilities as well as testing and inspection measures shall meet the technical requirements of the corresponding welding engineering items.
3 Before welding skill qualification and welding in engineering, the construction organization shall be provided with welding procedure qualification with corresponding items.
3.0.5 Welding environment shall meet the following requirements:
1 The welding ambient temperature shall meet the temperature required by weldment welding without influencing the operating skill of welder.
2 The wind velocity while welding shall meet the following requirements:
1) The wind velocity for shielded metal arc welding, self-shielded flux cored arc welding and gas welding shall not be greater than 8m/s.
2) The wind velocity for tungsten inert gas arc welding and metal inert gas arc welding shall not be greater than 2m/s.
3 The relative humidity within 1m away from the welding arc shall meet the following requirements:
1) The relative humidity for aluminum and aluminum alloy welding shall not be greater than 80%.
2) The relative humidity for welding of other materials shall not be greater than 90%.
4 The protective measures shall be taken for welding in rain and snow weather.
3.0.6 Repair of unqualified weld shall meet the following requirements:
1 For weld in need of welding repair, the defect cause shall be analyzed, and the procedure document for welding repair shall be prepared.
2 The defects shall be cleared up before repairing, and the non-destructive testing may be adopted to confirm it if necessary.
3 The shape and dimension of groove at repaired part of welding shall avoid welding defect and be convenient for welding operation.
4 If it is required to preheat, the preheating temperature shall be properly raised comparing with the original weld.
5 Repairing on the same part of the weld should not be conducted for more than twice.
3.0.7 Before engineering welding, the fixtures for welding and heat treatment shall be inspected and calibrated, their operating performance shall be confirmed to be stable and secure. The measuring instruments and equipment for inspection and test shall be in validity period for verification or calibration.
3.0.8 The welding for stainless steel and non-ferrous metal shall be arranged in special site and be equipped with special assembly welding fixture, it shall not be messed up with other products such as ferrous metal. The workplace of welding for stainless steel and non-ferrous metal shall be clean, dry and free of pollution.
4 Materials
4.0.1 The base metal adopted in welding engineering shall be provided with quality assurance documents of manufactory and shall meet the requirements of the current national standard and design document.
4.0.2 Prior to use the base metal, it shall be subjected to inspection and acceptance in accordance with the requirements of the current relevant standard of the nation and design document, its mark shall be clear and complete and shall be able to trace back to the product quality assurance document.
4.0.3 The welding materials shall meet the requirements of design document and those specified as follows:
1 The welding materials shall be provided with quality assurance document issued by manufactory.
2 The carbon steel and alloy steel electrode, welding wire as well as welding flux shall respectively meet the requirements of the current standards of the Nation "Carbon steel covered electrodes" (GB/T 5117), "Low alloy steel covered electrodes" (GB/T 5118), "Stainless steel covered electrodes" (GB/T 983), "Wire rods for welding" (GB/T 3429), "Stainless steel wire rods for welding" (GB/T 4241), "Steel wires for melt welding" (GB/T 14957), "Welding electrodes and rods for gas shielding arc welding of carbon and low alloy steel" (GB/T 8110), "Stainless steel rods and wires for inert-gas shield welding" (YB/T 5091), "Carbon steel electrodes and fluxs for submerged arc welding" (GB/T 5293), "Low alloy steel electrodes and fluxs for submerged arc welding" (GB/T 12470), "Stainless steel electrodes and fluxs for submerged arc welding" (GB/T 17854), "Carbon steel flux cored electrodes for arc welding" (GB/T 10045), "Low alloy steel flux cored electrodes for arc welding" (GB/T 17493) and "Stainless steel flux cored wires" (GB/T 17853).
3 The aluminum and aluminum alloy welding wires shall meet the requirements of the current national standard "Aluminum and aluminum alloy wires and rods" (GB/T 10858).
4 The copper and copper alloy welding wires shall meet the requirements of the current national standard "Copper and copper alloy wires and rods" (GB/T 9460).
5 The titanium and titanium alloy welding wire shall meet the requirements of the current national standards "Titanium and titanium alloy wire" (GB/T 3623) and "Technical permission of welding materials for pressure equipment - Section 7: Titanium and titanium-alloy welding electrodes and rods" (NB/T 47018.7).
6 The nickel and nickel alloy welding rods and wires shall respectively meet the requirements of the current national standards "Nickel and nickel alloy covered welding electrodes" (GB/T 13814) and "Nickel and nickel alloy wires and rods" (GB/T 15620).
7 The male pin and ceramic ring shall meet the requirements of the current national standard "Cheese head studs for arc stud welding" (GB/T 10433).
Contents of GB 50236-2011
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
