This specification applies to the construction and acceptance of welding projects for manual arc welding, argon arc welding, carbon dioxide gas shielded welding, submerged arc welding and oxyacetylene welding of carbon steel, alloy steel, aluminum and aluminum alloys, copper and copper alloys, industrial pure titanium, nickel and nickel alloys. GB 50236-1998 Construction and Acceptance Specification for Field Equipment and Industrial Pipeline Welding Projects GB50236-1998 Standard Download Decompression Password: www.bzxz.net

Engineering Construction Standard Full-text Information System
National Standard of the People's Republic of China
GB50236—98
Code for construction and acceptance of fieldequipment, industrial pipe welding engineeringConstruction Standard
1998-12-11Release
1999-06-01
State Administration of Quality and Technical Supervision
Ministry of Construction of the People's Republic of China
Engineering Construction Standard Full-text Information System
Jointly Released
Engineering Construction Standard Full-text Information System
National Standard of the People's Republic of China
Field Equipment, Industrial Pipe Welding
Engineering Construction and Acceptance Code
Code for construction and acceptance of fieldequipment, industrial pipe welding engineeringGB50236-98
Editor department: Former Ministry of Chemical Industry of the People's Republic of ChinaApproval department: Ministry of Construction of the People's Republic of ChinaEffective date: June 1, 1999
1998Beijing
Engineering Construction Standard Full Text Information System
Engineering Construction Standard Full Text Information System
Notice on the release of the national standard "Construction and Acceptance Specifications for Field Equipment and Industrial Pipeline Welding Engineering" Jianbiao [1998] No. 253
According to the requirements of the State Planning Commission's Document No. 290 [1991], the "Construction and Acceptance Specifications for Field Equipment and Industrial Pipeline Welding Engineering" jointly revised by the former Ministry of Chemical Industry and relevant departments has been reviewed by relevant departments. The "Construction and Acceptance Specifications for Field Equipment and Industrial Pipeline Welding Engineering" GB50236-98 is now approved as a mandatory national standard and will be implemented from June 1, 1999. The original "Construction and Acceptance Specifications for Field Equipment and Industrial Pipeline Welding Engineering" (GBJ236-82) is abolished at the same time. This specification is managed by the State Petroleum and Chemical Industry Bureau, and its specific interpretation and other work is the responsibility of the National Chemical Construction Standardization Management Center. The publication and distribution is organized by the Standard and Quota Research Institute of the Ministry of Construction.
Ministry of Construction of the People's Republic of China
December 11, 1998
Engineering Construction Standards Full Text Information System
Engineering Construction Standards Full Text Information System
2 General Provisions...
Welding Procedure Qualification
......
General Provisions
4.2 Evaluation Rules
Test and Evaluation
Welder Examination
General Provisions
.2. Contents and methods of operation skills examination·5.3 Evaluation of test pieces
Welding of carbon steel and alloy steel
General provisions
Pre-welding preparation
Welding process requirements
Pre-welding preheating and post-welding heat treatment
Welding of aluminum and aluminum alloys
General provisions
Pre-welding preparation
Welding process requirements
000000000000
（6）
…(22)
. (24)
Welding of copper and copper alloys
General provisions
8.2 Preparation before welding
100000000o
0000988aaaaaaa00a000000000905000+++++0..0000++0000000+++++++++.8.3
Welding process requirements
..--..--.-----....
Welding of industrial pure titanium…
Engineering Construction Standard Full-text Information System
(43)
(48)
.00..00
......
......
Engineering Construction Standard Full-text Information System
General Provisions
9.2 Preparation before welding
9.3 Welding process requirements
10 Welding of nickel and nickel alloys
General Provisions
10.2 Preparation before welding
10.3 Welding process requirements
·． Welding inspection
Inspection before welding
Inspection during welding·
Appendix A
Appendix B
Appendix C
Appendix D
Appendix E
Appendix F
Appendix G
Inspection after welding·
Acceptance of welding project
·(58)
Format of welding procedure assessment report and welding operation instruction......(67)
Format of welder examination record, welder examination result registration form and welder qualification certificate
Groove form and Dimensions
Selection of welding materials
Radiographic inspection of aluminum and aluminum alloy welds
Radiographic inspection of industrial pure titanium welds
Terms used in this specification
Additional explanation
Engineering Construction Standard Full Text Information System
...000.0.
(88)
(97)
(102)
Engineering Construction Standard Full Text Information System
This specification is formulated to ensure the quality of equipment and industrial metal pipeline welding projects at construction sites.
2This specification applies to the construction and acceptance of manual arc welding, argon arc welding, carbon dioxide gas shielded welding, submerged arc welding and oxyacetylene welding of carbon steel, alloy steel, aluminum and aluminum alloys, copper and copper alloys, industrial pure titanium, nickel and nickel alloys. 3 This code does not apply to welders of boilers and pressure vessels welded at the construction site. 1.0.3
The safety technology and labor protection of welding projects shall comply with the relevant provisions of the current national guidelines, policies, laws and regulations. 1.0.5 In addition to the provisions of this code, the construction of welding projects shall also comply with the provisions of the current national standards and specifications.
Engineering Construction Standard Full Text Information System
Engineering Construction Standard Full Text Information System
2 General Provisions
2.0.1 The design documents shall indicate the parent material, welding materials, weld coefficient and the form of weld groove, and put forward requirements for welding methods, preheating before welding, heat treatment after welding and welding inspection.
Welding personnel and their responsibilities shall comply with the following provisions: 2.0.2.1 Welding technicians shall be personnel with secondary technical school degree or above and more than 1 year of welding production practice.
Welding technicians shall be responsible for welding process assessment, preparation of welding operation instructions and welding technical measures, guidance of welding operations, participation in welding quality management, handling of welding technical issues, and organization of welding technical data.
2.0.2.2 Welding quality inspectors shall be personnel with a cultural level equivalent to or above secondary technical school, with certain welding experience and technical level. Welding quality inspectors shall conduct comprehensive inspection and control of on-site welding operations, be responsible for determining weld inspection locations, assessing welding quality, issuing inspection documents, and participating in the review of welding technical measures.
2.0.2.3 Nondestructive testing personnel shall be personnel who have passed the assessment of a professional assessment organization authorized by the state, and shall engage in welding inspection and review work according to the qualified assessment items and authority.
Nondestructive testing personnel shall conduct inspections based on the inspected locations determined by the welding quality inspectors, assess weld quality, issue inspection reports, and refuse to inspect welds whose appearance does not meet the inspection requirements.
Welders must take the examination in accordance with the provisions of Chapter 5 of this specification, and can only start welding after passing the examination.
Welders shall perform welding in accordance with the prescribed welding operation instructions and welding technical measures. When the working conditions and the requirements of the welding operation instructions and welding technical measures do not meet the engineering construction standard full-text information systemwww.bzxz.net
Engineering construction standard full-text information system
, welding shall be refused.
2.0.2.5 Welding heat treatment personnel shall receive professional training. Welding heat treatment personnel shall perform weld heat treatment work in accordance with the relevant provisions of the specifications, welding operation instructions and design documents. 2.0.3 The construction unit shall meet the following conditions: 2.0.3.1 The construction unit shall establish a welding quality management system and shall have welding technicians, welding quality inspection personnel, non-destructive testing personnel, welders and welding heat treatment personnel that meet the requirements of Article 2.0.2.
2.0.3.2 The welding equipment and inspection and testing methods of the construction unit shall meet the technical requirements of the corresponding welding engineering project.
2.0.3.3 Before the welder examination and engineering welding, the construction unit shall have the welding process assessment of the corresponding project.
2.0.4 The welding environment shall comply with the following provisions: 2.0.4.1 The welding environment temperature shall ensure that the welding temperature is sufficient for the weldment and the welder's skills are not affected.
2.0.4.2 The wind speed during welding shall not exceed the following provisions. When it exceeds the provisions, there shall be wind protection facilities.
(1) Manual arc welding, submerged arc welding, oxyacetylene welding: 8m/s. (2) Argon arc welding, carbon dioxide gas shielded welding: 2m/s. 2.0.4.3 The relative humidity within 1m of the welding arc shall comply with the following provisions: (1) Aluminum and aluminum alloy welding: not more than 80%. (2) Welding of other materials: not more than 90%. 2.0.4.4 Welding should not be performed when the weld surface is wet, covered with ice and snow, or when it is raining, snowing or windy, and the welder and weld are not protected. 2.0.5 For the repair of unqualified welds, quality analysis should be conducted before repair. When the number of repairs on the same part exceeds two times, repair measures should be formulated and the repair can be carried out only after approval by the welding technical person in charge. The repair welding process should be the same as the welding process of the original weld and should comply with the provisions of Article 4.2.10 of this specification.
Engineering Construction Standard Full Text Information System
Engineering Construction Standard Full Text Information System
3 Materials
3.0.1 The materials used in the welding project shall comply with the provisions of the design documents. 3.0.2 The materials must have a quality certificate from the manufacturer, and their quality shall not be lower than that of the current national standards.
3.0.3 Before using the materials, they should be inspected and accepted in accordance with the provisions of the relevant current national standards. For new materials selected in the design, the design unit shall provide the weldability data of the material.
3.0.4 Welding rods shall comply with the current national standards "Carbon Steel Welding Rods" GB5117, "Low Alloy Steel Welding Rods" GB5118, "Low Temperature Steel Welding Rods" JB2385, "Stainless Steel Welding Rods" GB983, "Overlay Welding Rods" GB984, "Aluminum and Aluminum Alloy Welding Rods" GB3669, "Copper and Copper Alloy Welding Rods" GB3670, "Nickel and Nickel Alloy Welding Rods" GB/T13814. 3.0.5 The welding wire shall comply with the current national standards GB1300 for steel wire for welding, GB4242 for stainless steel wire for welding, GB10858 for aluminum and aluminum alloy welding wire, GB9460 for copper and copper alloy welding wire, GB3623 for titanium and titanium alloy welding wire, GBn8110 for cold-drawn high-temperature alloy for welding, and GB8110 for welding wire for carbon dioxide gas shielded welding.
The storage place and drying and decontamination facilities of welding materials at the construction site shall comply with the current national standard JB3223 for quality management regulations of welding rods, and a system for storage, drying, cleaning and distribution shall be established.
3.0.7 The flux used for submerged arc welding shall comply with the current national standards GB5293 for arc welding flux for carbon steel and GB1270 for submerged arc welding flux for low alloy steel. 3.0.8 The argon gas used in argon arc welding shall comply with the provisions of the current national standard "Argon" GB4842, and the purity shall not be less than 99.96%. 3.0.9 For manual tungsten electrode fluorine arc welding, cerium tungsten electrode or needle tungsten electrode should be used. The purity of carbon dioxide gas used in carbon dioxide gas shielded welding shall not be less than 99.5%, and the water content shall not exceed 0.005%. It should be preheated and dried before use. When the gas pressure in the bottle is lower than 0.98MPa, it should be stopped. 3.0.11 The purity of oxygen used in oxyacetylene welding shall not be less than 98.5%, and the purity of acetylene gas and the residual pressure in the gas cylinder shall comply with the provisions of the current national standard "Dissolved Acetylene" GB6819. When calcium carbide is used to prepare acetylene gas, the quality of calcium carbide can be determined by checking the sulfur and phosphorus content in the weld, and its sulfur and phosphorus content should not exceed the standard value of the parent material.
Engineering Construction Standard Full Text Information System
Engineering Construction Standard Full Text Information System
4 Welding Procedure Qualification
4.1 General Provisions
4.1.1 After confirming the weldability of the material, the welding procedure qualification should be carried out on the welded material before engineering welding.
4.1.2 The materials used for welding procedure qualification should comply with the provisions of Chapter 3 of this specification. 4.1.3 The process measures such as groove processing, assembly and cleaning of welding procedure qualification test pieces (hereinafter referred to as qualification test pieces) should comply with the relevant provisions of this specification. 4.1.4 The qualification test pieces should be welded by skilled welders. 4.1.5 Records should be kept during the welding procedure qualification process, and a welding procedure qualification report should be submitted after the qualification is completed. The welding procedure qualification report should be reviewed and signed by the welding technology person in charge. The format of the welding procedure qualification report should comply with the provisions of Section A.0.1 of Appendix A of this Code. 4.1.6 Before welding, a welding operation instruction should be prepared based on the welding procedure qualification report. One welding operation instruction can be prepared based on one or more welding procedure qualification reports, and one welding procedure qualification report can be used to prepare multiple welding operation instructions. The format of the welding operation instruction should comply with the provisions of Section A.0.2 of Appendix A of this Code.
Different construction units within a quality management system do not need to repeat the qualification of the same welding procedure when the provisions of Section 2.0.3 of this Code are met. 4.2 Qualification Rules
4.2.1 The welding procedure qualification should be conducted on grooved butt weld test pieces. The welding procedure qualified by grooved butt weld test pieces can also be used for fillet welds. 4.2.2 The qualification test pieces should be tubular test pieces or plate test pieces. The welding procedure qualified by plate test pieces can be used for tubular weldments, and the welding procedure qualified by tubular test pieces can also be used for plate weldments.
Engineering Construction Standard Full-text Information System
Engineering Construction Standard Full-text Information System
3 Parent materials shall be classified and grouped according to their chemical composition, mechanical properties and welding properties in accordance with the provisions of Table 4.2.34.2.3
. For parent materials that cannot be classified and grouped according to the provisions of Table 4.2.3, welding procedure assessment shall be carried out separately.
Classification and grouping table of parent materials
Category number Group number
2A—1
2A—2
2A—3
2B—1
2B—2
2B—3
5A—1
Parent material type
Carbon steel, whose carbon content is less than or equal to
Low alloy structural steel, whose lower tensile strength
limit is less than 480MPa
Low alloy structural steel, whose tensile strength The lower limit of strength is 480~550MPa. The lower limit of tensile strength is 550~620MPa. The lower limit of low-temperature alloy steel is -40℃. The lower limit of low-temperature alloy steel is -70℃. The lower limit of low-temperature alloy steel is -90℃. Heat-resistant steel 0.5Cr—0.5Mo. Heat-resistant steel 1Cr—0.5Mo. 1.25Cr—0. 5Mo
1Cr—0.5Mo—V
Heat-resistant steel
2.25Cr—1Mo
2Cr—0.5Mo
Engineering Construction Standard Full-text Information System
No. Example
Q235—A·F.Q235—AB,C
20R, 20G, 20HP, 10, 20, 25
16Mn,||tt ||16MnR,
16MnRC,
15MnV, 15MnVR.15MnVRC
15MnVNR,18MnMoNbR
1 6MnDR
09Mn2VD, 09Mn2VDR
12CrMo
15CrMo
12Cr1Mov
12C2Mo2 The wind speed during welding shall not exceed the following provisions. When it exceeds the provisions, wind protection facilities shall be provided.
(1) Manual arc welding, submerged arc welding, oxyacetylene welding: 8m/s. (2) Argon arc welding, carbon dioxide gas shielded welding: 2m/s. 2.0.4.3 The relative humidity within 1m of the welding arc shall meet the following requirements: (1) Aluminum and aluminum alloy welding: not more than 80%. (2) Welding of other materials: not more than 90%. 2.0.4.4 Welding shall not be carried out when the weld surface is wet, covered with ice and snow, or when it is raining, snowing or windy, and the welder and weld are not protected. 2.0.5 For the repair of unqualified welds, quality analysis shall be carried out before repair. When the number of repairs on the same part exceeds two times, repair measures shall be formulated and approved by the welding technical person in charge before repair. The repair welding process shall be the same as the welding process of the original weld and shall comply with the provisions of Article 4.2.10 of this Code.
Engineering Construction Standard Full Text Information System
Engineering Construction Standard Full Text Information System
3 Materials
3.0.1 The materials used in welding projects shall comply with the provisions of the design documents. 3.0.2 The materials must have a quality certificate from the manufacturer, and their quality shall not be lower than that of the current national standards.
3.0.3 Before using the materials, they shall be inspected and accepted in accordance with the provisions of the current national standards. For new materials selected for design, the design unit shall provide the weldability data of the materials.
3.0.4 The welding rod shall comply with the provisions of the current national standards "Carbon Steel Welding Rod" GB5117, "Low Alloy Steel Welding Rod" GB5118, "Low Temperature Steel Welding Rod" JB2385, "Stainless Steel Welding Rod" GB983, "Overlay Welding Rod" GB984, "Aluminum and Aluminum Alloy Welding Rod" GB3669, "Copper and Copper Alloy Welding Rod" GB3670, "Nickel and Nickel Alloy Welding Rod" GB/T13814. 3.0.5 The welding wire shall comply with the provisions of the current national standards "Steel Wire for Welding" GB1300, "Stainless Steel Wire for Welding" GB4242, "Aluminum and Aluminum Alloy Welding Wire" GB10858, "Copper and Copper Alloy Welding Wire" GB9460, "Titanium and Titanium Alloy Welding Wire" GB3623, "High Temperature Alloy Cold Drawn Wire for Welding" GBn8110, "Welding Wire for Carbon Dioxide Gas Shielded Welding" GB8110.
The storage place and drying and decontamination facilities of welding materials at the construction site shall comply with the provisions of the current national standard "Quality Management Regulations for Welding Rods" JB3223, and a storage, drying, cleaning and distribution system shall be established.
3.0.7 The flux used for submerged arc welding shall comply with the provisions of the current national standards "Carbon Steel Arc Welding Flux" GB5293 and "Low Alloy Steel Submerged Arc Welding Flux" GB1270. 3.0.8 The argon gas used for argon arc welding shall comply with the provisions of the current national standard "Argon Gas" GB4842, and the purity shall not be less than 99.96%. 3.0.9 For manual tungsten electrode fluorine arc welding, cerium tungsten electrode or needle tungsten electrode should be used. The purity of carbon dioxide gas used in carbon dioxide gas shielded welding should not be lower than 99.5%, and the water content should not exceed 0.005%. It should be preheated and dried before use. When the gas pressure in the bottle is lower than 0.98MPa, it should be stopped. 3.0.11 The purity of oxygen used in oxyacetylene welding should not be lower than 98.5%, and the purity of acetylene gas and the residual pressure in the gas cylinder should comply with the provisions of the current national standard "Dissolved Acetylene" GB6819. When calcium carbide is used to prepare acetylene gas, the quality of calcium carbide can be determined by checking the sulfur and phosphorus content in the weld, and its sulfur and phosphorus content should not exceed the standard value of the parent material.
Engineering Construction Standard Full Text Information System
Engineering Construction Standard Full Text Information System
4 Welding Procedure Qualification
4.1 General Provisions
4.1.1 After confirming the weldability of the material, the welding procedure qualification shall be carried out on the material to be welded before the engineering welding.
4.1.2 The materials used for welding procedure qualification shall comply with the provisions of Chapter 3 of this Code. 4.1.3 The process measures such as groove processing, assembly and cleaning of welding procedure qualification test pieces (hereinafter referred to as qualification test pieces) shall comply with the relevant provisions of this Code. 4.1.4 The qualification test pieces shall be welded by skilled welders. 4.1.5 Records shall be kept during the welding procedure qualification process, and a welding procedure qualification report shall be submitted after the qualification is completed. The welding procedure qualification report shall be reviewed and signed by the welding technical person in charge. The format of the welding procedure qualification report should comply with the provisions of Article A.0.1 of Appendix A of this Code. 4.1.6 Before welding, a welding operation instruction shall be prepared based on the welding procedure qualification report. One welding operation instruction can be prepared based on one or more welding procedure qualification reports, and one welding procedure qualification report can be used to prepare multiple welding operation instructions. The format of the welding operation instruction should comply with the provisions of Section A.0.2 of Appendix A of this specification.
Different construction units within a quality management system do not need to repeat the qualification of the same welding procedure when the provisions of Section 2.0.3 of this specification are met. 4.2 Qualification rules
4.2.1 The welding procedure qualification shall be conducted on grooved butt weld specimens. The welding procedure qualified by grooved butt weld specimens can also be used for fillet welds. 4.2.2 The qualification specimens shall be tubular specimens or plate specimens. The welding procedure qualified by plate specimens can be used for tubular weldments, and the welding procedure qualified by tubular specimens can also be used for plate weldments.
Engineering Construction Standard Full-text Information System
Engineering Construction Standard Full-text Information System
3 Parent materials shall be classified and grouped according to their chemical composition, mechanical properties and welding properties in accordance with the provisions of Table 4.2.34.2.3
. For parent materials that cannot be classified and grouped according to the provisions of Table 4.2.3, welding procedure assessment shall be carried out separately.
Classification and grouping table of parent materials
Category number Group number
2A—1
2A—2
2A—3
2B—1
2B—2
2B—3
5A—1
Parent material type
Carbon steel, whose carbon content is less than or equal to
Low alloy structural steel, whose lower tensile strength
limit is less than 480MPa
Low alloy structural steel, whose tensile strength The lower limit of strength is 480~550MPa. The lower limit of tensile strength is 550~620MPa. The lower limit of low-temperature alloy steel is -40℃. The lower limit of low-temperature alloy steel is -70℃. The lower limit of low-temperature alloy steel is -90℃. Heat-resistant steel 0.5Cr—0.5Mo. Heat-resistant steel 1Cr—0.5Mo. 1.25Cr—0. 5Mo
1Cr—0.5Mo—V
Heat-resistant steel
2.25Cr—1Mo
2Cr—0.5Mo
Engineering Construction Standard Full-text Information System
No. Example
Q235—A·F.Q235—AB,C
20R, 20G, 20HP, 10, 20, 25
16Mn,||tt ||16MnR,
16MnRC,
15MnV, 15MnVR.15MnVRC
15MnVNR,18MnMoNbR
1 6MnDR
09Mn2VD, 09Mn2VDR
12CrMo
15CrMo
12Cr1Mov
12C2Mo2 The wind speed during welding shall not exceed the following provisions. When it exceeds the provisions, wind protection facilities shall be provided.
(1) Manual arc welding, submerged arc welding, oxyacetylene welding: 8m/s. (2) Argon arc welding, carbon dioxide gas shielded welding: 2m/s. 2.0.4.3 The relative humidity within 1m of the welding arc shall meet the following requirements: (1) Aluminum and aluminum alloy welding: not more than 80%. (2) Welding of other materials: not more than 90%. 2.0.4.4 Welding shall not be carried out when the weld surface is wet, covered with ice and snow, or when it is raining, snowing or windy, and the welder and weld are not protected. 2.0.5 For the repair of unqualified welds, quality analysis shall be carried out before repair. When the number of repairs on the same part exceeds two times, repair measures shall be formulated and approved by the welding technical person in charge before repair. The repair welding process shall be the same as the welding process of the original weld and shall comply with the provisions of Article 4.2.10 of this Code.
Engineering Construction Standard Full Text Information System
Engineering Construction Standard Full Text Information System
3 Materials
3.0.1 The materials used in welding projects shall comply with the provisions of the design documents. 3.0.2 The materials must have a quality certificate from the manufacturer, and their quality shall not be lower than that of the current national standards.
3.0.3 Before using the materials, they shall be inspected and accepted in accordance with the provisions of the current national standards. For new materials selected for design, the design unit shall provide the weldability data of the materials.
3.0.4 The welding rod shall comply with the provisions of the current national standards "Carbon Steel Welding Rod" GB5117, "Low Alloy Steel Welding Rod" GB5118, "Low Temperature Steel Welding Rod" JB2385, "Stainless Steel Welding Rod" GB983, "Overlay Welding Rod" GB984, "Aluminum and Aluminum Alloy Welding Rod" GB3669, "Copper and Copper Alloy Welding Rod" GB3670, "Nickel and Nickel Alloy Welding Rod" GB/T13814. 3.0.5 The welding wire shall comply with the provisions of the current national standards "Steel Wire for Welding" GB1300, "Stainless Steel Wire for Welding" GB4242, "Aluminum and Aluminum Alloy Welding Wire" GB10858, "Copper and Copper Alloy Welding Wire" GB9460, "Titanium and Titanium Alloy Welding Wire" GB3623, "High Temperature Alloy Cold Drawn Wire for Welding" GBn8110, "Welding Wire for Carbon Dioxide Gas Shielded Welding" GB8110.
The storage place and drying and decontamination facilities of welding materials at the construction site shall comply with the provisions of the current national standard "Quality Management Regulations for Welding Rods" JB3223, and a storage, drying, cleaning and distribution system shall be established.
3.0.7 The flux used for submerged arc welding shall comply with the provisions of the current national standards "Carbon Steel Arc Welding Flux" GB5293 and "Low Alloy Steel Submerged Arc Welding Flux" GB1270. 3.0.8 The argon gas used for argon arc welding shall comply with the provisions of the current national standard "Argon Gas" GB4842, and the purity shall not be less than 99.96%. 3.0.9 For manual tungsten electrode fluorine arc welding, cerium tungsten electrode or needle tungsten electrode should be used. The purity of carbon dioxide gas used in carbon dioxide gas shielded welding should not be lower than 99.5%, and the water content should not exceed 0.005%. It should be preheated and dried before use. When the gas pressure in the bottle is lower than 0.98MPa, it should be stopped. 3.0.11 The purity of oxygen used in oxyacetylene welding should not be lower than 98.5%, and the purity of acetylene gas and the residual pressure in the gas cylinder should comply with the provisions of the current national standard "Dissolved Acetylene" GB6819. When calcium carbide is used to prepare acetylene gas, the quality of calcium carbide can be determined by checking the sulfur and phosphorus content in the weld, and its sulfur and phosphorus content should not exceed the standard value of the parent material.
Engineering Construction Standard Full Text Information System
Engineering Construction Standard Full Text Information System
4 Welding Procedure Qualification
4.1 General Provisions
4.1.1 After confirming the weldability of the material, the welding procedure qualification shall be carried out on the material to be welded before the engineering welding.
4.1.2 The materials used for welding procedure qualification shall comply with the provisions of Chapter 3 of this Code. 4.1.3 The process measures such as groove processing, assembly and cleaning of welding procedure qualification test pieces (hereinafter referred to as qualification test pieces) shall comply with the relevant provisions of this Code. 4.1.4 The qualification test pieces shall be welded by skilled welders. 4.1.5 Records shall be kept during the welding procedure qualification process, and a welding procedure qualification report shall be submitted after the qualification is completed. The welding procedure qualification report shall be reviewed and signed by the welding technical person in charge. The format of the welding procedure qualification report should comply with the provisions of Article A.0.1 of Appendix A of this Code. 4.1.6 Before welding, a welding operation instruction shall be prepared based on the welding procedure qualification report. One welding operation instruction can be prepared based on one or more welding procedure qualification reports, and one welding procedure qualification report can be used to prepare multiple welding operation instructions. The format of the welding operation instruction should comply with the provisions of Section A.0.2 of Appendix A of this specification.
Different construction units within a quality management system do not need to repeat the qualification of the same welding procedure when the provisions of Section 2.0.3 of this specification are met. 4.2 Qualification rules
4.2.1 The welding procedure qualification shall be conducted on grooved butt weld specimens. The welding procedure qualified by grooved butt weld specimens can also be used for fillet welds. 4.2.2 The qualification specimens shall be tubular specimens or plate specimens. The welding procedure qualified by plate specimens can be used for tubular weldments, and the welding procedure qualified by tubular specimens can also be used for plate weldments.
Engineering Construction Standard Full-text Information System
Engineering Construction Standard Full-text Information System
3 Parent materials shall be classified and grouped according to their chemical composition, mechanical properties and welding properties in accordance with the provisions of Table 4.2.34.2.3
. For parent materials that cannot be classified and grouped according to the provisions of Table 4.2.3, welding procedure assessment shall be carried out separately.
Classification and grouping table of parent materials
Category number Group number
2A—1
2A—2
2A—3
2B—1
2B—2
2B—3
5A—1
Parent material type
Carbon steel, whose carbon content is less than or equal to
Low alloy structural steel, whose lower tensile strength
limit is less than 480MPa
Low alloy structural steel, whose tensile strength The lower limit of strength is 480~550MPa. The lower limit of tensile strength is 550~620MPa. The lower limit of low-temperature alloy steel is -40℃. The lower limit of low-temperature alloy steel is -70℃. The lower limit of low-temperature alloy steel is -90℃. Heat-resistant steel 0.5Cr—0.5Mo. Heat-resistant steel 1Cr—0.5Mo. 1.25Cr—0. 5Mo
1Cr—0.5Mo—V
Heat-resistant steel
2.25Cr—1Mo
2Cr—0.5Mo
Engineering Construction Standard Full-text Information System
No. Example
Q235—A·F.Q235—AB,C
20R, 20G, 20HP, 10, 20, 25
16Mn,||tt ||16MnR,
16MnRC,
15MnV, 15MnVR.15MnVRC
15MnVNR,18MnMoNbR
1 6MnDR
09Mn2VD, 09Mn2VDR
12CrMo
15CrMo
12Cr1Mov
12C2Mo2 The material must have a quality certificate from the manufacturer, and its quality must not be lower than the requirements of the current national standards.
3.0.3 Before using the material, it should be inspected and accepted in accordance with the requirements of the relevant national standards. For new materials selected for design, the design unit should provide the weldability data of the material.
3.0.4 The welding rod should comply with the requirements of the current national standards "Carbon Steel Welding Rod" GB5117, "Low Alloy Steel Welding Rod" GB5118, "Low Temperature Steel Welding Rod" JB2385, "Stainless Steel Welding Rod" GB983, "Overlay Welding Rod" GB984, "Aluminum and Aluminum Alloy Welding Rod" GB3669, "Copper and Copper Alloy Welding Rod" GB3670, "Nickel and Nickel Alloy Welding Rod" GB/T13814. 3.0.5 The welding wire shall comply with the current national standards GB1300 for steel wire for welding, GB4242 for stainless steel wire for welding, GB10858 for aluminum and aluminum alloy welding wire, GB9460 for copper and copper alloy welding wire, GB3623 for titanium and titanium alloy welding wire, GBn8110 for cold-drawn high-temperature alloy for welding, and GB8110 for welding wire for carbon dioxide gas shielded welding.
The storage place and drying and decontamination facilities of welding materials at the construction site shall comply with the current national standard JB3223 for quality management regulations of welding rods, and a system for storage, drying, cleaning and distribution shall be established.
3.0.7 The flux used for submerged arc welding shall comply with the current national standards GB5293 for arc welding flux for carbon steel and GB1270 for submerged arc welding flux for low alloy steel. 3.0.8 The argon gas used in argon arc welding shall comply with the provisions of the current national standard "Argon" GB4842, and the purity shall not be less than 99.96%. 3.0.9 For manual tungsten electrode fluorine arc welding, cerium tungsten electrode or needle tungsten electrode should be used. The purity of carbon dioxide gas used in carbon dioxide gas shielded welding shall not be less than 99.5%, and the water content shall not exceed 0.005%. It should be preheated and dried before use. When the gas pressure in the bottle is lower than 0.98MPa, it should be stopped. 3.0.11 The purity of oxygen used in oxyacetylene welding shall not be less than 98.5%, and the purity of acetylene gas and the residual pressure in the gas cylinder shall comply with the provisions of the current national standard "Dissolved Acetylene" GB6819. When calcium carbide is used to prepare acetylene gas, the quality of calcium carbide can be determined by checking the sulfur and phosphorus content in the weld, and its sulfur and phosphorus content should not exceed the standard value of the parent material.
Engineering Construction Standard Full Text Information System
Engineering Construction Standard Full Text Information System
4 Welding Procedure Qualification
4.1 General Provisions
4.1.1 After confirming the weldability of the material, the welding procedure qualification should be carried out on the welded material before engineering welding.
4.1.2 The materials used for welding procedure qualification should comply with the provisions of Chapter 3 of this specification. 4.1.3 The process measures such as groove processing, assembly and cleaning of welding procedure qualification test pieces (hereinafter referred to as qualification test pieces) should comply with the relevant provisions of this specification. 4.1.4 The qualification test pieces should be welded by skilled welders. 4.1.5 Records should be kept during the welding procedure qualification process, and a welding procedure qualification report should be submitted after the qualification is completed. The welding procedure qualification report should be reviewed and signed by the welding technology person in charge. The format of the welding procedure qualification report should comply with the provisions of Section A.0.1 of Appendix A of this Code. 4.1.6 Before welding, a welding operation instruction should be prepared based on the welding procedure qualification report. One welding operation instruction can be prepared based on one or more welding procedure qualification reports, and one welding procedure qualification report can be used to prepare multiple welding operation instructions. The format of the welding operation instruction should comply with the provisions of Section A.0.2 of Appendix A of this Code.
Different construction units within a quality management system do not need to repeat the qualification of the same welding procedure when the provisions of Section 2.0.3 of this Code are met. 4.2 Qualification Rules
4.2.1 The welding procedure qualification should be conducted on grooved butt weld test pieces. The welding procedure qualified by grooved butt weld test pieces can also be used for fillet welds. 4.2.2 The qualification test pieces should be tubular test pieces or plate test pieces. The welding procedure qualified by plate test pieces can be used for tubular weldments, and the welding procedure qualified by tubular test pieces can also be used for plate weldments.
Engineering Construction Standard Full-text Information System
Engineering Construction Standard Full-text Information System
3 Parent materials shall be classified and grouped according to their chemical composition, mechanical properties and welding properties in accordance with the provisions of Table 4.2.34.2.3
. For parent materials that cannot be classified and grouped according to the provisions of Table 4.2.3, welding procedure assessment shall be carried out separately.
Classification and grouping table of parent materials
Category number Group number
2A—1
2A—2
2A—3
2B—1
2B—2
2B—3
5A—1
Parent material type
Carbon steel, whose carbon content is less than or equal to
Low alloy structural steel, whose lower tensile strength
limit is less than 480MPa
Low alloy structural steel, whose tensile strength The lower limit of strength is 480~550MPa. The lower limit of tensile strength is 550~620MPa. The lower limit of low-temperature alloy steel is -40℃. The lower limit of low-temperature alloy steel is -70℃. The lower limit of low-temperature alloy steel is -90℃. Heat-resistant steel 0.5Cr—0.5Mo. Heat-resistant steel 1Cr—0.5Mo. 1.25Cr—0. 5Mo
1Cr—0.5Mo—V
Heat-resistant steel
2.25Cr—1Mo
2Cr—0.5Mo
Engineering Construction Standard Full-text Information System
No. Example
Q235—A·F.Q235—AB,C
20R, 20G, 20HP, 10, 20, 25
16Mn,||tt ||16MnR,
16MnRC,
15MnV, 15MnVR.15MnVRC
15MnVNR,18MnMoNbR
1 6MnDR
09Mn2VD, 09Mn2VDR
12CrMo
15CrMo
12Cr1Mov
12C2Mo2 The material must have a quality certificate from the manufacturer, and its quality must not be lower than the requirements of the current national standards.
3.0.3 Before using the material, it should be inspected and accepted in accordance with the requirements of the relevant national standards. For new materials selected for design, the design unit should provide the weldability data of the material.
3.0.4 The welding rod should comply with the requirements of the current national standards "Carbon Steel Welding Rod" GB5117, "Low Alloy Steel Welding Rod" GB5118, "Low Temperature Steel Welding Rod" JB2385, "Stainless Steel Welding Rod" GB983, "Overlay Welding Rod" GB984, "Aluminum and Aluminum Alloy Welding Rod" GB3669, "Copper and Copper Alloy Welding Rod" GB3670, "Nickel and Nickel Alloy Welding Rod" GB/T13814. 3.0.5 The welding wire shall comply with the current national standards GB1300 for steel wire for welding, GB4242 for stainless steel wire for welding, GB10858 for aluminum and aluminum alloy welding wire, GB9460 for copper and copper alloy welding wire, GB3623 for titanium and titanium alloy welding wire, GBn8110 for cold-drawn high-temperature alloy for welding, and GB8110 for welding wire for carbon dioxide gas shielded welding.
The storage place and drying and decontamination facilities of welding materials at the construction site shall comply with the current national standard JB3223 for quality management regulations of welding rods, and a system for storage, drying, cleaning and distribution shall be established.
3.0.7 The flux used for submerged arc welding shall comply with the current national standards GB5293 for arc welding flux for carbon steel and GB1270 for submerged arc welding flux for low alloy steel. 3.0.8 The argon gas used in argon arc welding shall comply with the provisions of the current national standard "Argon" GB4842, and the purity shall not be less than 99.96%. 3.0.9 For manual tungsten electrode fluorine arc welding, cerium tungsten electrode or needle tungsten electrode should be used. The purity of carbon dioxide gas used in carbon dioxide gas shielded welding shall not be less than 99.5%, and the water content shall not exceed 0.005%. It should be preheated and dried before use. When the gas pressure in the bottle is lower than 0.98MPa, it should be stopped. 3.0.11 The purity of oxygen used in oxyacetylene welding shall not be less than 98.5%, and the purity of acetylene gas and the residual pressure in the gas cylinder shall comply with the provisions of the current national standard "Dissolved Acetylene" GB6819. When calcium carbide is used to prepare acetylene gas, the quality of calcium carbide can be determined by checking the sulfur and phosphorus content in the weld, and its sulfur and phosphorus content should not exceed the standard value of the parent material.
Engineering Construction Standard Full Text Information System
Engineering Construction Standard Full Text Information System
4 Welding Procedure Qualification
4.1 General Provisions
4.1.1 After confirming the weldability of the material, the welding procedure qualification should be carried out on the welded material before engineering welding.
4.1.2 The materials used for welding procedure qualification should comply with the provisions of Chapter 3 of this specification. 4.1.3 The process measures such as groove processing, assembly and cleaning of welding procedure qualification test pieces (hereinafter referred to as qualification test pieces) should comply with the relevant provisions of this specification. 4.1.4 The qualification test pieces should be welded by skilled welders. 4.1.5 Records should be kept during the welding procedure qualification process, and a welding procedure qualification report should be submitted after the qualification is completed. The welding procedure qualification report should be reviewed and signed by the welding technology person in charge. The format of the welding procedure qualification report should comply with the provisions of Section A.0.1 of Appendix A of this Code. 4.1.6 Before welding, a welding operation instruction should be prepared based on the welding procedure qualification report. One welding operation instruction can be prepared based on one or more welding procedure qualification reports, and one welding procedure qualification report can be used to prepare multiple welding operation instructions. The format of the welding operation instruction should comply with the provisions of Section A.0.2 of Appendix A of this Code.
Different construction units within a quality management system do not need to repeat the qualification of the same welding procedure when the provisions of Section 2.0.3 of this Code are met. 4.2 Qualification Rules
4.2.1 The welding procedure qualification should be conducted on grooved butt weld test pieces. The welding procedure qualified by grooved butt weld test pieces can also be used for fillet welds. 4.2.2 The qualification test pieces should be tubular test pieces or plate test pieces. The welding procedure qualified by plate test pieces can be used for tubular weldments, and the welding procedure qualified by tubular test pieces can also be used for plate weldments.
Engineering Construction Standard Full-text Information System
Engineering Construction Standard Full-text Information System
3 Parent materials shall be classified and grouped according to their chemical composition, mechanical properties and welding properties in accordance with the provisions of Table 4.2.34.2.3
. For parent materials that cannot be classified and grouped according to the provisions of Table 4.2.3, welding procedure assessment shall be carried out separately.
Classification and grouping table of parent materials
Category number Group number
2A—1
2A—2
2A—3
2B—1
2B—2
2B—3
5A—1
Parent material type
Carbon steel, whose carbon content is less than or equal to
Low alloy structural steel, whose lower tensile strength
limit is less than 480MPa
Low alloy structural steel, whose tensile strength The lower limit of strength is 480~550MPa. The lower limit of tensile strength is 550~620MPa. The lower limit of low-temperature alloy steel is -40℃. The lower limit of low-temperature alloy steel is -70℃. The lower limit of low-temperature alloy steel is -90℃. Heat-resistant steel 0.5Cr—0.5Mo. Heat-resistant steel 1Cr—0.5Mo. 1.25Cr—0. 5Mo
1Cr—0.5Mo—V
Heat-resistant steel
2.25Cr—1Mo
2Cr—0.5Mo
Engineering Construction Standard Full-text Information System
No. Example
Q235—A·F.Q235—AB,C
20R, 20G, 20HP, 10, 20, 25
16Mn,||tt ||16MnR,
16MnRC,
15MnV, 15MnVR.15MnVRC
15MnVNR,18MnMoNbR
1 6MnDR
09Mn2VD, 09Mn2VDR
12CrMo
15CrMo
12Cr1Mov
12C2Mo11 The purity of oxygen used in oxyacetylene welding shall not be less than 98.5%, and the purity of acetylene gas and the residual pressure in the gas cylinder shall comply with the provisions of the current national standard "Dissolved Acetylene" GB6819. When calcium carbide is used to prepare acetylene gas, the quality of calcium carbide can be determined by checking the sulfur and phosphorus content in the weld, and its sulfur and phosphorus content shall not exceed the standard value of the parent material.
Engineering Construction Standard Full Text Information System
Engineering Construction Standard Full Text Information System
4 Welding Procedure Qualification
4.1 General Provisions
4.1.1 After confirming the weldability of the material, the welding procedure qualification shall be carried out on the welded material before engineering welding.
4.1.2 The materials used in the welding procedure qualification shall comply with the provisions of Chapter 3 of this specification. 4.1.3 The process measures such as groove processing, assembly and cleaning of the welding procedure qualification test piece (hereinafter referred to as the qualification test piece) shall comply with the relevant provisions of this specification. 4.1.4 The qualification test piece shall be welded by skilled welders. 4.1.5 Records shall be kept during the welding procedure qualification process, and a welding procedure qualification report shall be submitted after the qualification is completed. The welding procedure qualification report shall be reviewed and signed by the welding technical person in charge. The format of the welding procedure qualification report shall comply with the provisions of Article A.0.1 of Appendix A of this specification. 4.1.6 Before welding, a welding operation instruction shall be prepared based on the welding procedure qualification report. A welding operation instruction can be prepared based on one or more welding procedure qualification reports, and a welding procedure qualification report can be used to prepare multiple welding operation instructions. The format of the welding operation instruction shall comply with the provisions of Article A.0.2 of Appendix A of this specification.
Different construction units within a quality management system do not need to repeat the qualification of the same welding procedure when the provisions of Article 2.0.3 of this specification are met. 4.2 Assessment rules
4.2.1 The assessment of welding procedures shall be conducted using grooved butt weld specimens. Welding procedures that have been qualified for grooved butt weld specimens may also be used for fillet welds. 4.2.2 The assessment specimens shall be tubular specimens or plate specimens. Welding procedures that have been qualified for plate specimens may be used for tubular weldments, and welding procedures that have been qualified for tubular weldments may also be used for plate weldments.
Engineering Construction Standards Full-text Information System
Engineering Construction Standards Full-text Information System
3 Parent materials shall be classified and grouped according to their chemical composition, mechanical properties and welding properties in accordance with the provisions of Tables 4.2.3 and 4.2.3
. For parent materials that cannot be classified and grouped according to the provisions of Table 4.2.3, welding procedure assessment shall be conducted separately.
Classification and grouping table of parent materials
Category number Group number
2A—1
2A—2
2A—3
2B—1
2B—2
2B—3
5A—1
Parent material type
Carbon steel, whose carbon content is less than or equal to
Low alloy structural steel, whose lower tensile strength
limit is less than 480MPa
Low alloy structural steel, whose tensile strength The lower limit of strength is 480~550MPa. The lower limit of tensile strength is 550~620MPa. The lower limit of low-temperature alloy steel is -40℃. The lower limit of low-temperature alloy steel is -70℃. The lower limit of low-temperature alloy steel is -90℃. Heat-resistant steel 0.5Cr—0.5Mo. Heat-resistant steel 1Cr—0.5Mo. 1.25Cr—0. 5Mo
1Cr—0.5Mo—V
Heat-resistant steel
2.25Cr—1Mo
2Cr—0.5Mo
Engineering Construction Standard Full-text Information System
No. Example
Q235—A·F.Q235—AB,C
20R, 20G, 20HP, 10, 20, 25
16Mn,||tt ||16MnR,
16MnRC,
15MnV, 15MnVR.15MnVRC
15MnVNR,18MnMoNbR
1 6MnDR
09Mn2VD, 09Mn2VDR
12CrMo
15CrMo
12Cr1Mov
12C2Mo11 The purity of oxygen used in oxyacetylene welding shall not be less than 98.5%, and the purity of acetylene gas and the residual pressure in the gas cylinder shall comply with the provisions of the current national standard "Dissolved Acetylene" GB6819. When calcium carbide is used to prepare acetylene gas, the quality of calcium carbide can be determined by checking the sulfur and phosphorus content in the weld, and its sulfur and phosphorus content shall not exceed the standard value of the parent material.
Engineering Construction Standard Full Text Information System
Engineering Construction Standard Full Text Information System
4 Welding Procedure Qualification
4.1 General Provisions
4.1.1 After confirming the weldability of the material, the welding procedure qualification shall be carried out on the welded material before engineering welding.
4.1.2 The materials used in the welding procedure qualification shall comply with the provisions of Chapter 3 of this specification. 4.1.3 The process measures such as groove processing, assembly and cleaning of the welding procedure qualification test piece (hereinafter referred to as the qualification test piece) shall comply with the relevant provisions of this specification. 4.1.4 The qualification test piece shall be welded by skilled welders. 4.1.5 Records shall be kept during the welding procedure qualification process, and a welding procedure qualification report shall be submitted after the qualification is completed. The welding procedure qualification report shall be reviewed and signed by the welding technical person in charge. The format of the welding procedure qualification report shall comply with the provisions of Article A.0.1 of Appendix A of this specification. 4.1.6 Before welding, a welding operation instruction shall be prepared based on the welding procedure qualification report. A welding operation instruction can be prepared based on one or more welding procedure qualification reports, and a welding procedure qualification report can be used to prepare multiple welding operation instructions. The format of the welding operation instruction shall comply with the provisions of Article A.0.2 of Appendix A of this specification.
Different construction units within a quality management system do not need to repeat the qualification of the same welding procedure when the provisions of Article 2.0.3 of this specification are met. 4.2 Assessment rules
4.2.1 The assessment of welding procedures shall be conducted using grooved butt weld specimens. Welding procedures that have been qualified for grooved butt weld specimens may also be used for fillet welds. 4.2.2 The assessment specimens shall be tubular specimens or plate specimens. Welding procedures that have been qualified for plate specimens may be used for tubular weldments, and welding procedures that have been qualified for tubular weldments may also be used for plate weldments.
Engineering Construction Standards Full-text Information System
Engineering Construction Standards Full-text Information System
3 Parent materials shall be classified and grouped according to their chemical composition, mechanical properties and welding properties in accordance with the provisions of Tables 4.2.3 and 4.2.3
. For parent materials that cannot be classified and grouped according to the provisions of Table 4.2.3, welding procedure assessment shall be conducted separately.
Classification and grouping table of parent materials
Category number Group number
2A—1
2A—2
2A—3
2B—1
2B—2
2B—3
5A—1
Parent material type
Carbon steel, whose carbon content is less than or equal to
Low alloy structural steel, whose lower tensile strength
limit is less than 480MPa
Low alloy structural steel, whose tensile strength The lower limit of strength is 480~550MPa. The lower limit of tensile strength is 550~620MPa. The lower limit of low-temperature alloy steel is -40℃. The lower limit of low-temperature alloy steel is -70℃. The lower limit of low-temperature alloy steel is -90℃. Heat-resistant steel 0.5Cr—0.5Mo. Heat-resistant steel 1Cr—0.5Mo. 1.25Cr—0. 5Mo
1Cr—0.5Mo—V
Heat-resistant steel
2.25Cr—1Mo
2Cr—0.5Mo
Engineering Construction Standard Full-text Information System
No. Example
Q235—A·F.Q235—AB,C
20R, 20G, 20HP, 10, 20, 25
16Mn,||tt ||16MnR,
16MnRC,
15MnV, 15MnVR.15MnVRC
15MnVNR,18MnMoNbR
1 6MnDR
09Mn2VD, 09Mn2VDR
12CrMo
15CrMo
12Cr1Mov
12C2Mo18MnMoNbR
16MnDR
09Mn2VD, 09Mn2VDR
12CrMo
15CrMo
12Cr1Mov
12C2Mo18MnMoNbR
16MnDR
09Mn2VD, 09Mn2VDR
12CrMo
15CrMo
12Cr1Mov
12C2Mo
Tip: This standard content only shows part of the intercepted content of the complete standard. If you need the complete standard, please go to the top to download the complete standard document for free.