GBJ 236-1982 Construction and acceptance specifications for field equipment and industrial pipeline welding projects GBJ236-82
Some standard content:
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National Standard of the People's Republic of China
Specification for construction and acceptance of field equipment and industrial pipeline welding
GBJ236-82
Wang Cheng Construction Standard Full Text Information System
Specification for Construction Standard Full Text Information System of Engineering Construction Standard
National Standard of the People's Republic of China
Specification for construction and acceptance of field equipment and industrial pipeline welding engineering
GBJ236-82
Editor Department: Ministry of Chemical Industry
Approval Department: National Capital Construction Committee Implementation Date: August 1, 1982 Date
Engineering Construction Standard Full Text Information System
Engineering Construction Standard Full Text Information System
Document of the National Capital Construction Commission
(82) Jianfa Shizi No. 25
Notice on Issuing the "Construction and Acceptance Specifications for Field Equipment and Industrial Pipeline Welding Projects" Relevant ministries and bureaus of the State Council, construction commissions of provinces, municipalities and autonomous regions, and capital construction engineering corps: The "Construction and Acceptance Specifications for Field Equipment and Industrial Pipeline Welding Projects" compiled by the Ministry of Chemical Industry, entrusted by our commission, has been approved as a national standard construction and acceptance specification after review by relevant departments, with the number GBJ236-82, and will be implemented from August 1, 1982.
This specification is managed and interpreted by the Capital Construction Bureau of the Ministry of Chemical Industry. January 20, 1982
Engineering Construction Standards Full Text Information System
Engineering Construction Standards Full Text Information System
Chapter 1 GeneralbzxZ.net
Section 1
Section 2
Chapter 2
General Provisions
Welding of Carbon Steel and Alloy Steel
Section 1
Section 2
Section 3
Section 4
Chapter 3
Section 1
Section 2
Section 3
Chapter 4
Section 2
Section 3
Chapter 5
Section 1
Section 2
Section 3
Chapter 6
Section 1
Section 2||tt ||Section 3
Pre-welding preparation
Welding procedure requirements·
Preheating before welding and heat treatment after welding
Welding of aluminum and aluminum alloys
Pre-welding preparation
Welding procedure requirements
Welding of copper and copper alloys
Pre-welding preparation
Welding procedure requirements·
Welding procedure test
Test principles
Test requirements
Test evaluation
Welder examination
General provisions
Welder operation skill examination
Chapter 7 Standard Welding Inspection
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Section 1
Inspection before welding
Intermediate welding inspection·
Section 2
Section 3 Section
Inspection after welding
Acceptance of welding project
Section 4
Table 7.4.1~Table 7.4.5
Appendix 1
Chemical composition and mechanical properties of commonly used steels...Chemical composition and mechanical properties of deposited metal of commonly used welding rods Appendix 2
Appendix 3
Chemical composition and matching flux table of commonly used welding wires Appendix 4
Appendix 5
Selection table of welding materials and post-weld heat treatment temperature Common groove types and sizes of weldments
Appendix 6
Chemical composition and mechanical properties of commonly used aluminum and aluminum alloys in annealed state
Appendix 7
Appendix 8
Appendix 9
Appendix 10
Appendix 11
Appendix 1 2
Chemical composition of aluminum and aluminum alloy welding wire
Chemical composition of copper
Chemical composition of brass
Mechanical properties of copper and brass materials
Chemical composition of copper and copper alloy welding wire
Specialized electrician store
Yingying Electric
Formula of pickling solution and passivating solution…
Appendix 13 Process parameter table of manual tungsten inert gas welding·Appendix 14
Appendix 15
Process parameter table of semi-automatic tungsten inert gas welding Process parameter table of automatic tungsten inert gas welding
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Chapter 1
Section 1 Overview
Article 1.1.1 This specification is specially formulated to guide the welding engineering of equipment and industrial pipelines. It is applicable to the construction sites of engineering construction in industries such as petroleum, chemical industry, electric power, metallurgy, machinery and textile.
Article 1.1.2
This specification is applicable to manual arc welding, argon arc welding, submerged arc welding, carbon dioxide gas shielded welding and oxy-acetylene welding of carbon steel (carbon content is less than or equal to 0.3%), alloy steel (ordinary low alloy structural steel, low temperature steel, heat-resistant steel and austenitic stainless steel), aluminum and aluminum alloy (industrial pure aluminum and rust-proof aluminum alloy), copper and copper alloy (red copper and brass).
Article 1.1.3 The technical requirements and regulations in other standards and design documents used for on-site welding operations shall not be lower than those in this specification. Article 1.1.4 The safety technology and labor protection of welding operations shall be implemented in accordance with the current relevant regulations.
Section 2 General Provisions
Article 1.2.1 Requirements for materials:
1. The parent materials and welding materials used in welding projects should have factory quality certificates or quality re-inspection reports;
2. Parent materials and welding materials that have been included in national standards or ministerial standards should be given priority in welding projects;
3. If the design uses parent materials and welding materials that are not included in the standards, the weldability of the materials should be explained, and welding process test data that meet the design requirements should be provided. Article 1.2.2 Requirements for design documents:
Engineering construction design documents must indicate the parent materials, welding materials, weld grades and joint types,1
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and make clear requirements for welding methods, preheating before welding, heat treatment after welding and welding inspection.
Article 1.2.3 Requirements for construction units:
1. Construction units must have welding technicians, welding inspectors, welding testers and welders responsible for welding projects. 2. The welding equipment used by construction units must have stable parameters, flexible adjustment, meet welding process requirements and safe and reliable performance. If post-weld heat treatment is required, heat treatment facilities must be available; 3. Construction units must provide inspection equipment according to inspection requirements to detect weld quality;
4. The construction site must have a welding material storage place and drying and decontamination facilities that meet process requirements, and establish a strict storage, drying, cleaning and distribution system; 5. The construction site should have windproof, rain and snowproof and coldproof facilities. Article 1.2.4 Requirements for welding personnel:
Welding personnel refers to welding technicians, welding inspectors, welding testers and welders.
Welding inspectors and welding testers must be approved by the chief technical person in charge of the construction unit.
, Welding technicians
Welding technicians refer to technicians responsible for welding projects. Welding technicians should be responsible for preparing welding plans and welding process instructions, solving welding technical problems, organizing welding technical files, and guiding welders' work. 2. Welding inspectors
Welding inspectors should conduct comprehensive inspections and supervision of on-site welding work in accordance with technical specifications, design documents, and welding process instructions, and have the right to stop welding operations that violate relevant specifications and technical documents.
Welding inspectors should determine the inspected weld parts, assess welding quality, and issue inspection documents.
Welding inspectors should check welders' qualification certificates, and have the right to stop welding work for those whose welding quality is often unqualified.
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3. Welding Inspectors
Welding inspectors should be familiar with the principles of inspection work and the application of inspection equipment, and be able to correctly assess the defects of welded joints.
Welding inspectors should inspect the inspected parts determined by the welding inspectors, assess the quality of welds in a timely manner, and fill in, organize and keep all inspection records. IV. Welders
Welders engaged in welding operations covered by this specification must pass the examinations as follows:
1. Welders engaged in welding equipment, pressure vessels and their associated pipelines (referring to the first circumferential weld, the first flange surface or the first threaded joint connecting the inlet and outlet of steam boilers and pressure vessels to the external pipe) within the scope of the "Safety Supervision Regulations for Steam Boilers" and "Safety Supervision Regulations for Pressure Vessels" issued by the State Bureau of Labor must be examined in accordance with the requirements of the "Boiler and Pressure Vessel Welder Examination Rules" issued by the State Bureau of Labor;
2. Welders engaged in welding equipment, vessels and pipelines outside the scope of the "Safety Supervision Regulations for Steam Boilers" and "Safety Supervision Regulations for Pressure Vessels" must be examined in accordance with the provisions of Chapter 6 "Welder Examination" of this specification. Article 1.2.5 Construction units must conduct welding process tests before welding for the first use of steel types, as well as changes in welding material types, welding methods and welding processes. Before the welder examination and engineering welding, the construction unit must have qualified welding process test results, which should be signed by the chief technical person in charge. Article 1.2.6 Before welding, a welding process description should be prepared based on the process test results, and welding work should be carried out according to the description. Its main contents are as follows: 1. Welding materials; 2. Welding methods; 3. Groove types and preparation methods; 4. Assembly requirements and tolerances of weld joints; 5. Welding structure types; 6. Welding current types and polarity; 7. Wiring energy and protective gas flow rate; 8. Requirements for preheating, post-heating and inter-layer temperature; 9. Requirements for post-weld heat treatment; 10. Designated inspection methods.
Article 1.2.7 Classification of weld grades:
1. According to the requirements for weld surface quality and internal quality (see Table 7.3.1 and 7.3.3 of this specification), welds are divided into four corresponding grades. The applicable scope and number of radiographic flaw detection of each grade of welds are shown in Table 7.3.8-1 and Table 7.3.8-2 of this specification.
2. According to the different grades of welds, corresponding requirements are put forward for welding process and weld inspection.
Wang Cheng Construction Standard Full Text Information System
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Welding of Carbon Steel and Alloy Steel
Chapter 2
This chapter applies to manual arc welding, manual tungsten inert gas welding, submerged arc welding, carbon dioxide gas shielded welding and oxy-acetylene welding of carbon steel (C≤0.3%), ordinary low alloy structural steel, low temperature steel, heat-resistant steel and austenitic stainless steel. Section 1 Materials
Article 2.1.1 Parent materials and welding materials shall comply with the requirements of Article 1.2.1 of this Code and the provisions of the following standards:
I. Steel Plates
1. "Technical Conditions for High-quality Carbon Structural Steel Thin Plates" (GB71065) 2. "Technical Conditions for High-quality Carbon Structural Steel Hot-rolled Thick Plates" (GB711-65) 3. "Technical Conditions for Carbon Steel and Ordinary Low-alloy Steel Plates for Boiler Manufacturing" (GB713-72)
4. "Technical Conditions for Ordinary Carbon Steel and Low-alloy Structural Steel Thin Plates" (GB91266)
5. "Technical Conditions for Ordinary Carbon Steel and Low-alloy Steel Hot-rolled Thick Plates" (YB175-63)
6. "Technical Conditions for Alloy Structural Steel Thin Plates" (YB204-63) 7. "Technical Conditions for Carbon Steel and Ordinary Low-alloy Steel Hot-rolled Thick Plates for Pressure Vessels" (GB204-63) 8. "Technical conditions for ordinary carbon steel and ordinary low alloy steel thin plates for general purposes" (YB537-65)
9. "Technical conditions for stainless, acid-resistant and heat-resistant non-scaling steel thin plates" (YB541-70)
10. "Technical conditions for stainless, acid-resistant and heat-resistant non-scaling steel thick plates" (YB542-70)
11. "Technical conditions for stainless, acid-resistant and heat-resistant non-scaling steel thick plates" (YB543-70)
12. "Technical conditions for stainless, acid-resistant and heat-resistant non-scaling steel thick plates" (YB544-70)
13. "Technical conditions for stainless, acid-resistant and heat-resistant non-scaling steel thick plates" (YB545-70)
14. "Technical conditions for stainless, acid-resistant and heat-resistant non-scaling steel thick plates" (YB546-70)
15. "Technical conditions for stainless, acid-resistant and heat-resistant non-scaling steel thick plates" (YB547-70)
16. "Technical conditions for stainless, acid-resistant and heat-resistant non-scaling steel thick plates" (YB548-70)
17. "Technical conditions for stainless, acid-resistant and heat-resistant non-scaling steel thick plates" (YB549-70)
18. "Technical conditions for stainless, acid-resistant and heat-resistant non-scaling steel thick plates" (YB541-70)
19. "Technical conditions for stainless, acid-resistant and heat-resistant non-scaling steel thick plates" (YB54 System
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II. Steel Pipe
1. Seamless Steel Pipe (YB231-70)
2. Seamless Steel Pipe for Boiler (YB232-70)3. Steel Pipe for Water and Gas Transportation (YB23463)4. Steel Pipe for Petroleum Cracking (YB237-70)5. 5~152mm diameter electric welded steel pipe" (YB242-63) 6. "High-pressure seamless steel pipe for boiler" (YB52970) 7. "High-pressure seamless steel pipe for fertilizer" (YB80070) 8. "Stainless steel, acid-resistant steel seamless steel pipe" (YB80470) III. Welding materials
1. "Low-carbon steel and low-alloy high-strength steel welding rod" (GB981-76) 2. "Molybdenum and chromium-molybdenum heat-resistant steel welding rod" (GB982-76) 3. "Stainless steel welding rod" (GB983-76) 4. "Welding steel wire" (GB130077) 5. "Technical conditions for recommended steel grades for welding steel wire" (YB/Z11-76) The chemical composition and mechanical properties of commonly used steel materials are shown in Appendix Table 1 of this specification; the chemical composition and mechanical properties of commonly used electrode deposited metal are shown in Appendix Table 2 of this specification; the chemical composition of commonly used welding wires is shown in Appendix Table 3 of this specification. Section 2. 1.2 The selection of welding materials should be based on the chemical composition, mechanical properties, crack resistance of the welded joint, preheating before welding, heat treatment after welding and use conditions of the parent material.
, When welding the same type of steel, the selection of welding materials should generally meet the following requirements:
1. The performance and chemical composition of the weld metal are equivalent to the parent material; 2. The process performance is good.
2. When welding dissimilar steels, the selection of welding materials should meet the following requirements: 1. When both sides are not austenitic stainless steel, it can be selected according to the steel with lower alloy content or between the two:
2. When one side is austenitic stainless steel, a welding wire with a nickel content higher than that of the stainless steel can be selected) Information System
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3. For welding at the junction of the base layer and the composite layer of the composite steel plate, a transition layer electrode should be selected. The selection of welding materials is shown in the welding material selection section in Appendix Table 4 of this specification. Article 2.1.3 Manual tungsten arc welding should use cerium tungsten rods or needle tungsten rods; the purity of the argon gas used should be above 99.9%.
The purity of the gas used in carbon dioxide gas shielded welding should not be less than 99.5%. It should be preheated and dried before use. It should not be used when the pressure in the bottle is less than 10 kg/Q. Article 2.1.4 The calcium carbide used in oxyacetylene welding should meet the requirements of the "Calcium Carbide" (HG2-737-75) standard; the quality of the calcium carbide can also be determined by checking the sulfur and phosphorus content in the weld metal (according to the parent material standard). When welding welds above level I, acetylene gas should be filtered before use.
Section 2 Preparation before welding
Article 2.2.1 The setting of the weld should avoid stress concentration areas and facilitate welding and heat treatment. Generally, the following requirements should be met: 1. When adjacent sections of equipment, containers and steel plate coils are paired, the distance between the longitudinal seams should be greater than three times the wall thickness and should not be less than 100 mm; 2. The distance between two adjacent longitudinal seams on the same section of a container or steel plate coil should not be less than 300 mm;
3. The distance between the center line of the boiler heating surface pipe weld and the starting point of the pipe bending, the outer wall of the drum, the header, and the edge of the support and hanger should not be less than 70 mm; 4. The center line of the pipeline butt weld should not be less than the outer diameter of the pipe from the starting point of the pipe bending, and should not be less than 100 mm (except for welded, cast and hot-pressed pipe fittings), and the distance from the edge of the support and hanger should not be less than 50 mm; 5. The distance between the center lines of two adjacent butt welds of the pipeline should meet the following requirements: 1. When the nominal diameter is less than 150 mm, it should not be less than the outer diameter of the pipe; 2. When the nominal diameter is greater than or equal to 150 mm, it should not be less than 150 mm. 6. It is not advisable to make holes on the weld and its edges. If holes must be made, they should comply with the provisions of Article 7.3.6 of this Code.
Article 2.2.2 The selection of groove type and size of weldment should take into account the ease of ensuring the quality of welded joints, the small amount of filler metal, good working conditions, easy operation and reduction of welding W.bzsosO.coI 7777 weld grade classification:
1. According to the requirements for weld surface quality and internal quality (see Table 7.3.1 and 7.3.3 of this specification), welds are divided into four corresponding grades. The applicable scope and number of radiographic flaw detection of each grade of welds are shown in Table 7.3.8-1 and Table 7.3.8-2 of this specification.
2. According to the different grades of welds, corresponding requirements are put forward for welding process and weld inspection.
Wang Cheng Construction Standard Full Text Information System
Engineering Construction Standard Full Text Information System
Welding of Carbon Steel and Alloy Steel
Chapter 2
This chapter applies to manual arc welding, manual tungsten inert gas welding, submerged arc welding, carbon dioxide gas shielded welding and oxy-acetylene welding of carbon steel (C≤0.3%), ordinary low alloy structural steel, low temperature steel, heat-resistant steel and austenitic stainless steel. Section 1 Materials
Article 2.1.1 Parent materials and welding materials shall comply with the requirements of Article 1.2.1 of this Code and the provisions of the following standards:
I. Steel Plates
1. "Technical Conditions for High-quality Carbon Structural Steel Thin Plates" (GB71065) 2. "Technical Conditions for High-quality Carbon Structural Steel Hot-rolled Thick Plates" (GB711-65) 3. "Technical Conditions for Carbon Steel and Ordinary Low-alloy Steel Plates for Boiler Manufacturing" (GB713-72)
4. "Technical Conditions for Ordinary Carbon Steel and Low-alloy Structural Steel Thin Plates" (GB91266)
5. "Technical Conditions for Ordinary Carbon Steel and Low-alloy Steel Hot-rolled Thick Plates" (YB175-63)
6. "Technical Conditions for Alloy Structural Steel Thin Plates" (YB204-63) 7. "Technical Conditions for Carbon Steel and Ordinary Low-alloy Steel Hot-rolled Thick Plates for Pressure Vessels" (GB204-63) 8. "Technical conditions for ordinary carbon steel and ordinary low alloy steel thin plates for general purposes" (YB537-65)
9. "Technical conditions for stainless, acid-resistant and heat-resistant non-scaling steel thin plates" (YB541-70)
10. "Technical conditions for stainless, acid-resistant and heat-resistant non-scaling steel thick plates" (YB542-70)
11. "Technical conditions for stainless, acid-resistant and heat-resistant non-scaling steel thick plates" (YB543-70)
12. "Technical conditions for stainless, acid-resistant and heat-resistant non-scaling steel thick plates" (YB544-70)
13. "Technical conditions for stainless, acid-resistant and heat-resistant non-scaling steel thick plates" (YB545-70)
14. "Technical conditions for stainless, acid-resistant and heat-resistant non-scaling steel thick plates" (YB546-70)
15. "Technical conditions for stainless, acid-resistant and heat-resistant non-scaling steel thick plates" (YB547-70)
16. "Technical conditions for stainless, acid-resistant and heat-resistant non-scaling steel thick plates" (YB548-70)
17. "Technical conditions for stainless, acid-resistant and heat-resistant non-scaling steel thick plates" (YB549-70)
18. "Technical conditions for stainless, acid-resistant and heat-resistant non-scaling steel thick plates" (YB541-70)
19. "Technical conditions for stainless, acid-resistant and heat-resistant non-scaling steel thick plates" (YB54 System
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II. Steel Pipe
1. Seamless Steel Pipe (YB231-70)
2. Seamless Steel Pipe for Boiler (YB232-70)3. Steel Pipe for Water and Gas Transportation (YB23463)4. Steel Pipe for Petroleum Cracking (YB237-70)5. 5~152mm diameter electric welded steel pipe" (YB242-63) 6. "High-pressure seamless steel pipe for boiler" (YB52970) 7. "High-pressure seamless steel pipe for fertilizer" (YB80070) 8. "Stainless steel, acid-resistant steel seamless steel pipe" (YB80470) III. Welding materials
1. "Low-carbon steel and low-alloy high-strength steel welding rod" (GB981-76) 2. "Molybdenum and chromium-molybdenum heat-resistant steel welding rod" (GB982-76) 3. "Stainless steel welding rod" (GB983-76) 4. "Welding steel wire" (GB130077) 5. "Technical conditions for recommended steel grades for welding steel wire" (YB/Z11-76) The chemical composition and mechanical properties of commonly used steel materials are shown in Appendix Table 1 of this specification; the chemical composition and mechanical properties of commonly used electrode deposited metal are shown in Appendix Table 2 of this specification; the chemical composition of commonly used welding wires is shown in Appendix Table 3 of this specification. Section 2. 1.2 The selection of welding materials should be based on the chemical composition, mechanical properties, crack resistance of the welded joint, preheating before welding, heat treatment after welding and use conditions of the parent material.
, When welding the same type of steel, the selection of welding materials should generally meet the following requirements:
1. The performance and chemical composition of the weld metal are equivalent to the parent material; 2. The process performance is good.
2. When welding dissimilar steels, the selection of welding materials should meet the following requirements: 1. When both sides are not austenitic stainless steel, it can be selected according to the steel with lower alloy content or between the two:
2. When one side is austenitic stainless steel, a welding wire with a nickel content higher than that of the stainless steel can be selected) Information System
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3. For welding at the junction of the base layer and the composite layer of the composite steel plate, a transition layer electrode should be selected. The selection of welding materials is shown in the welding material selection section in Appendix Table 4 of this specification. Article 2.1.3 Manual tungsten arc welding should use cerium tungsten rods or needle tungsten rods; the purity of the argon gas used should be above 99.9%.
The purity of the gas used in carbon dioxide gas shielded welding should not be less than 99.5%. It should be preheated and dried before use. It should not be used when the pressure in the bottle is less than 10 kg/Q. Article 2.1.4 The calcium carbide used in oxyacetylene welding should meet the requirements of the "Calcium Carbide" (HG2-737-75) standard; the quality of the calcium carbide can also be determined by checking the sulfur and phosphorus content in the weld metal (according to the parent material standard). When welding welds above level I, acetylene gas should be filtered before use.
Section 2 Preparation before welding
Article 2.2.1 The setting of the weld should avoid stress concentration areas and facilitate welding and heat treatment. Generally, the following requirements should be met: 1. When adjacent sections of equipment, containers and steel plate coils are paired, the distance between the longitudinal seams should be greater than three times the wall thickness and should not be less than 100 mm; 2. The distance between two adjacent longitudinal seams on the same section of a container or steel plate coil should not be less than 300 mm;
3. The distance between the center line of the boiler heating surface pipe weld and the starting point of the pipe bending, the outer wall of the drum, the header, and the edge of the support and hanger should not be less than 70 mm; 4. The center line of the pipeline butt weld should not be less than the outer diameter of the pipe from the starting point of the pipe bending, and should not be less than 100 mm (except for welded, cast and hot-pressed pipe fittings), and the distance from the edge of the support and hanger should not be less than 50 mm; 5. The distance between the center lines of two adjacent butt welds of the pipeline should meet the following requirements: 1. When the nominal diameter is less than 150 mm, it should not be less than the outer diameter of the pipe; 2. When the nominal diameter is greater than or equal to 150 mm, it should not be less than 150 mm. 6. It is not advisable to make holes on the weld and its edges. If holes must be made, they should comply with the provisions of Article 7.3.6 of this Code.
Article 2.2.2 The selection of groove type and size of weldment should take into account the ease of ensuring the quality of welded joints, the small amount of filler metal, good working conditions, easy operation and reduction of welding W.bzsosO.coI 77 weld grade classification:
1. According to the requirements for weld surface quality and internal quality (see Table 7.3.1 and 7.3.3 of this specification), welds are divided into four corresponding grades. The applicable scope and number of radiographic flaw detection of each grade of welds are shown in Table 7.3.8-1 and Table 7.3.8-2 of this specification.
2. According to the different grades of welds, corresponding requirements are put forward for welding process and weld inspection.
Wang Cheng Construction Standard Full Text Information System
Engineering Construction Standard Full Text Information System
Welding of Carbon Steel and Alloy Steel
Chapter 2
This chapter applies to manual arc welding, manual tungsten inert gas welding, submerged arc welding, carbon dioxide gas shielded welding and oxy-acetylene welding of carbon steel (C≤0.3%), ordinary low alloy structural steel, low temperature steel, heat-resistant steel and austenitic stainless steel. Section 1 Materials
Article 2.1.1 Parent materials and welding materials shall comply with the requirements of Article 1.2.1 of this Code and the provisions of the following standards:
I. Steel Plates
1. "Technical Conditions for High-quality Carbon Structural Steel Thin Plates" (GB71065) 2. "Technical Conditions for High-quality Carbon Structural Steel Hot-rolled Thick Plates" (GB711-65) 3. "Technical Conditions for Carbon Steel and Ordinary Low-alloy Steel Plates for Boiler Manufacturing" (GB713-72)
4. "Technical Conditions for Ordinary Carbon Steel and Low-alloy Structural Steel Thin Plates" (GB91266)
5. "Technical Conditions for Ordinary Carbon Steel and Low-alloy Steel Hot-rolled Thick Plates" (YB175-63)
6. "Technical Conditions for Alloy Structural Steel Thin Plates" (YB204-63) 7. "Technical Conditions for Carbon Steel and Ordinary Low-alloy Steel Hot-rolled Thick Plates for Pressure Vessels" (GB204-63) 8. "Technical conditions for ordinary carbon steel and ordinary low alloy steel thin plates for general purposes" (YB537-65)
9. "Technical conditions for stainless, acid-resistant and heat-resistant non-scaling steel thin plates" (YB541-70)
10. "Technical conditions for stainless, acid-resistant and heat-resistant non-scaling steel thick plates" (YB542-70)
11. "Technical conditions for stainless, acid-resistant and heat-resistant non-scaling steel thick plates" (YB543-70)
12. "Technical conditions for stainless, acid-resistant and heat-resistant non-scaling steel thick plates" (YB544-70)
13. "Technical conditions for stainless, acid-resistant and heat-resistant non-scaling steel thick plates" (YB545-70)
14. "Technical conditions for stainless, acid-resistant and heat-resistant non-scaling steel thick plates" (YB546-70)
15. "Technical conditions for stainless, acid-resistant and heat-resistant non-scaling steel thick plates" (YB547-70)
16. "Technical conditions for stainless, acid-resistant and heat-resistant non-scaling steel thick plates" (YB548-70)
17. "Technical conditions for stainless, acid-resistant and heat-resistant non-scaling steel thick plates" (YB549-70)
18. "Technical conditions for stainless, acid-resistant and heat-resistant non-scaling steel thick plates" (YB541-70)
19. "Technical conditions for stainless, acid-resistant and heat-resistant non-scaling steel thick plates" (YB54 System
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II. Steel Pipe
1. Seamless Steel Pipe (YB231-70)
2. Seamless Steel Pipe for Boiler (YB232-70)3. Steel Pipe for Water and Gas Transportation (YB23463)4. Steel Pipe for Petroleum Cracking (YB237-70)5. 5~152mm diameter electric welded steel pipe" (YB242-63) 6. "High-pressure seamless steel pipe for boiler" (YB52970) 7. "High-pressure seamless steel pipe for fertilizer" (YB80070) 8. "Stainless steel, acid-resistant steel seamless steel pipe" (YB80470) III. Welding materials
1. "Low-carbon steel and low-alloy high-strength steel welding rod" (GB981-76) 2. "Molybdenum and chromium-molybdenum heat-resistant steel welding rod" (GB982-76) 3. "Stainless steel welding rod" (GB983-76) 4. "Welding steel wire" (GB130077) 5. "Technical conditions for recommended steel grades for welding steel wire" (YB/Z11-76) The chemical composition and mechanical properties of commonly used steel materials are shown in Appendix Table 1 of this specification; the chemical composition and mechanical properties of commonly used electrode deposited metal are shown in Appendix Table 2 of this specification; the chemical composition of commonly used welding wires is shown in Appendix Table 3 of this specification. Section 2. 1.2 The selection of welding materials should be based on the chemical composition, mechanical properties, crack resistance of the welded joint, preheating before welding, heat treatment after welding and use conditions of the parent material.
, When welding the same type of steel, the selection of welding materials should generally meet the following requirements:
1. The performance and chemical composition of the weld metal are equivalent to the parent material; 2. The process performance is good.
2. When welding dissimilar steels, the selection of welding materials should meet the following requirements: 1. When both sides are not austenitic stainless steel, it can be selected according to the steel with lower alloy content or between the two:
2. When one side is austenitic stainless steel, a welding wire with a nickel content higher than that of the stainless steel can be selected) Information System
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3. For welding at the junction of the base layer and the composite layer of the composite steel plate, a transition layer electrode should be selected. The selection of welding materials is shown in the welding material selection section in Appendix Table 4 of this specification. Article 2.1.3 Manual tungsten arc welding should use cerium tungsten rods or needle tungsten rods; the purity of the argon gas used should be above 99.9%.
The purity of the gas used in carbon dioxide gas shielded welding should not be less than 99.5%. It should be preheated and dried before use. It should not be used when the pressure in the bottle is less than 10 kg/Q. Article 2.1.4 The calcium carbide used in oxyacetylene welding should meet the requirements of the "Calcium Carbide" (HG2-737-75) standard; the quality of the calcium carbide can also be determined by checking the sulfur and phosphorus content in the weld metal (according to the parent material standard). When welding welds above level I, acetylene gas should be filtered before use.
Section 2 Preparation before welding
Article 2.2.1 The setting of the weld should avoid stress concentration areas and facilitate welding and heat treatment. Generally, the following requirements should be met: 1. When adjacent sections of equipment, containers and steel plate coils are paired, the distance between the longitudinal seams should be greater than three times the wall thickness and should not be less than 100 mm; 2. The distance between two adjacent longitudinal seams on the same section of a container or steel plate coil should not be less than 300 mm;
3. The distance between the center line of the boiler heating surface pipe weld and the starting point of the pipe bending, the outer wall of the drum, the header, and the edge of the support and hanger should not be less than 70 mm; 4. The center line of the pipeline butt weld should not be less than the outer diameter of the pipe from the starting point of the pipe bending, and should not be less than 100 mm (except for welded, cast and hot-pressed pipe fittings), and the distance from the edge of the support and hanger should not be less than 50 mm; 5. The distance between the center lines of two adjacent butt welds of the pipeline should meet the following requirements: 1. When the nominal diameter is less than 150 mm, it should not be less than the outer diameter of the pipe; 2. When the nominal diameter is greater than or equal to 150 mm, it should not be less than 150 mm. 6. It is not advisable to make holes on the weld and its edges. If holes must be made, they should comply with the provisions of Article 7.3.6 of this Code.
Article 2.2.2 The selection of groove type and size of weldment should take into account the ease of ensuring the quality of welded joints, the small amount of filler metal, good working conditions, easy operation and reduction of welding W.bzsosO.coI 7"Electric welded steel pipe with diameter of 5~152mm" (YB242-63) 6. "High-pressure seamless steel pipe for boiler" (YB52970) 7. "High-pressure seamless steel pipe for fertilizer" (YB80070) 8. "Stainless and acid-resistant steel seamless steel pipe" (YB80470) III. Welding materials
1. "Low-carbon steel and low-alloy high-strength steel welding rod" (GB981-76) 2. "Molybdenum and chromium-molybdenum heat-resistant steel welding rod" (GB982-76) 3. "Stainless steel welding rod" (GB983-76) 4. "Steel wire for welding" (GB130077) 5. "Technical conditions for recommended steel grades for steel wire for welding" (YB/Z11-76) The chemical composition and mechanical properties of commonly used steels are shown in Appendix Table 1 of this specification; the chemical composition and mechanical properties of the deposited metal of commonly used welding rods are shown in Appendix Table 2 of this specification; the chemical composition of commonly used welding wires is shown in Appendix Table 3 of this specification. Article 2.1.2 The selection of welding materials shall be based on the chemical composition, mechanical properties, crack resistance of the welded joint, preheating before welding, heat treatment after welding and use conditions of the parent material.
, When welding the same type of steel, the selection of welding materials shall generally meet the following requirements:
1. The performance and chemical composition of the weld metal are equivalent to the parent material; 2. The process performance is good.
2. When welding dissimilar steels, the selection of welding materials should meet the following requirements: 1. When both sides are not austenitic stainless steel, the steel with lower alloy content or between the two can be selected:
2. When one side is austenitic stainless steel, a welding wire with a nickel content higher than that of the stainless steel can be selected (Huang Bar Standard Welding Wire) Information System
Engineering Construction Standard Full Text Information System
3. For welding at the junction of the base layer and the composite layer of the composite steel plate, a transition layer electrode should be selected. The selection of welding materials can be found in the welding material selection section in Appendix Table 4 of this specification. Article 2.1.3 Manual tungsten arc welding should use cerium tungsten rods or needle tungsten rods; the purity of the argon gas used should be above 99.9%.
The purity of the gas used in carbon dioxide gas shielded welding should not be less than 99.5%. It should be preheated and dried before use. It should not be used when the pressure in the bottle is less than 10 kg/Q. Article 2.1.4 The calcium carbide used in oxyacetylene welding should meet the requirements of the "Calcium Carbide" (HG2-737-75) standard; the quality of the calcium carbide can also be determined by checking the sulfur and phosphorus content in the weld metal (according to the parent material standard). When welding welds above level I, acetylene gas should be filtered before use.
Section 2 Preparation before welding
Article 2.2.1 The setting of the weld should avoid stress concentration areas and facilitate welding and heat treatment. Generally, the following requirements should be met: 1. When adjacent sections of equipment, containers and steel plate coils are paired, the distance between the longitudinal seams should be greater than three times the wall thickness and should not be less than 100 mm; 2. The distance between two adjacent longitudinal seams on the same section of a container or steel plate coil should not be less than 300 mm;
3. The distance between the center line of the boiler heating surface pipe weld and the starting point of the pipe bending, the outer wall of the drum, the header, and the edge of the support and hanger should not be less than 70 mm; 4. The center line of the pipeline butt weld should not be less than the outer diameter of the pipe from the starting point of the pipe bending, and should not be less than 100 mm (except for welded, cast and hot-pressed pipe fittings), and the distance from the edge of the support and hanger should not be less than 50 mm; 5. The distance between the center lines of two adjacent butt welds of the pipeline should meet the following requirements: 1. When the nominal diameter is less than 150 mm, it should not be less than the outer diameter of the pipe; 2. When the nominal diameter is greater than or equal to 150 mm, it should not be less than 150 mm. 6. It is not advisable to make holes on the weld and its edges. If holes must be made, they should comply with the provisions of Article 7.3.6 of this Code.
Article 2.2.2 The selection of groove type and size of weldment should take into account the ease of ensuring the quality of welded joints, the small amount of filler metal, good working conditions, easy operation and reduction of welding W.bzsosO.coI 7"Electric welded steel pipe with diameter of 5~152mm" (YB242-63) 6. "High-pressure seamless steel pipe for boiler" (YB52970) 7. "High-pressure seamless steel pipe for fertilizer" (YB80070) 8. "Stainless and acid-resistant steel seamless steel pipe" (YB80470) III. Welding materials
1. "Low-carbon steel and low-alloy high-strength steel welding rod" (GB981-76) 2. "Molybdenum and chromium-molybdenum heat-resistant steel welding rod" (GB982-76) 3. "Stainless steel welding rod" (GB983-76) 4. "Steel wire for welding" (GB130077) 5. "Technical conditions for recommended steel grades for steel wire for welding" (YB/Z11-76) The chemical composition and mechanical properties of commonly used steels are shown in Appendix Table 1 of this specification; the chemical composition and mechanical properties of the deposited metal of commonly used welding rods are shown in Appendix Table 2 of this specification; the chemical composition of commonly used welding wires is shown in Appendix Table 3 of this specification. Article 2.1.2 The selection of welding materials shall be based on the chemical composition, mechanical properties, crack resistance of the welded joint, preheating before welding, heat treatment after welding and use conditions of the parent material.
, When welding the same type of steel, the selection of welding materials shall generally meet the following requirements:
1. The performance and chemical composition of the weld metal are equivalent to the parent material; 2. The process performance is good.
2. When welding dissimilar steels, the selection of welding materials should meet the following requirements: 1. When both sides are not austenitic stainless steel, the steel with lower alloy content or between the two can be selected:
2. When one side is austenitic stainless steel, a welding wire with a nickel content higher than that of the stainless steel can be selected (Huang Bar Standard Welding Wire) Information System
Engineering Construction Standard Full Text Information System
3. For welding at the junction of the base layer and the composite layer of the composite steel plate, a transition layer electrode should be selected. The selection of welding materials can be found in the welding material selection section in Appendix Table 4 of this specification. Article 2.1.3 Manual tungsten arc welding should use cerium tungsten rods or needle tungsten rods; the purity of the argon gas used should be above 99.9%.
The purity of the gas used in carbon dioxide gas shielded welding should not be less than 99.5%. It should be preheated and dried before use. It should not be used when the pressure in the bottle is less than 10 kg/Q. Article 2.1.4 The calcium carbide used in oxyacetylene welding should meet the requirements of the "Calcium Carbide" (HG2-737-75) standard; the quality of the calcium carbide can also be determined by checking the sulfur and phosphorus content in the weld metal (according to the parent material standard). When welding welds above level I, acetylene gas should be filtered before use.
Section 2 Preparation before welding
Article 2.2.1 The setting of the weld should avoid stress concentration areas and facilitate welding and heat treatment. Generally, the following requirements should be met: 1. When adjacent sections of equipment, containers and steel plate coils are paired, the distance between the longitudinal seams should be greater than three times the wall thickness and should not be less than 100 mm; 2. The distance between two adjacent longitudinal seams on the same section of a container or steel plate coil should not be less than 300 mm;
3. The distance between the center line of the boiler heating surface pipe weld and the starting point of the pipe bending, the outer wall of the drum, the header, and the edge of the support and hanger should not be less than 70 mm; 4. The center line of the pipeline butt weld should not be less than the outer diameter of the pipe from the starting point of the pipe bending, and should not be less than 100 mm (except for welded, cast and hot-pressed pipe fittings), and the distance from the edge of the support and hanger should not be less than 50 mm; 5. The distance between the center lines of two adjacent butt welds of the pipeline should meet the following requirements: 1. When the nominal diameter is less than 150 mm, it should not be less than the outer diameter of the pipe; 2. When the nominal diameter is greater than or equal to 150 mm, it should not be less than 150 mm. 6. It is not advisable to make holes on the weld and its edges. If holes must be made, they should comply with the provisions of Article 7.3.6 of this Code.
Article 2.2.2 The selection of groove type and size of weldment should take into account the ease of ensuring the quality of welded joints, the small amount of filler metal, good working conditions, easy operation and reduction of welding W.bzsosO.coI 7
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