This standard specifies the rules, test methods and qualified indexes of welding procedure qualification for butt weld and fillet weld, anticorrosive overlaying process qualification, welding procedure qualification for composite metallic materials, welding procedure qualification and supplementary welding procedure qualification for heat exchange tube and tube plate, and stud arc welding procedure qualification, for pressure equipment (boiler, pressure vessel and pressure piping).
This standard is applicable to welding techniques such as oxyfuel gas welding, shielded metal arc welding, submerged arc welding, gas tungstun arc welding, gas metal arc welding, electroslag welding, plasma arc welding, friction welding, electrogas welding and stud arc welding.
This standard is not applicable to gas cylinder.
2 Normative References
The following documents contain provisions which, through reference in this text, constitute provisions of this standard. For dated references, only the dated versions apply to this standard. For undated references, the latest edition of the normative document (include all the amendments) is applicable to this standard.
GB 150 (all Parts) Pressure Vessels
GB 151 Tubular Heat Exchangers
GB/T 228 Metallic Materials-Tensile Testing
GB/T 229 Metallic Materials - Charpy Pendulum Impact Test Method
GB/T 699 Quality Carbon Structural Steels
GB/T 700 Carbon Structural Steels
GB/T 710 Hot-rolled Quality Carbon Structural Steel Sheets and Strips
GB 24511-2009 Stainless Steel Plate, Sheet and Strip for Pressure Equipment
GB/T 24593 Welded Austenitic Stainless Steel Tubes for Boiler and Heat-exchanger
NB/T 47008 Carbon Steel and Alloy Steel Forgings for Pressure Equipment
NB/T 47009 Low-alloy Steel Forgings for Low Temperature Pressure Equipment
NB/T 47010 Stainless and Heat-resisting Steel Forgings for Pressure Equipment
NB/T 47018 (all parts) Technical Permission of Welding Materials for Pressure Equipment
JB/T 4730 (all parts) Nondestructive Testing of Pressure Equipment
JB/T 4734 Aluminium Welded Vessels
JB 4741 Nickel-copper Alloy Hot Rolled Plate for Pressure Vessels
JB 4742 Nickel-copper alloy Seamless Tube and Pipe for Pressure Vessels
JB 4743 Nickel-copper Alloy Forgings for Pressure Vessels
JB/T 9625 Specification for Pressure Retaining Casting of Boiler Pipe Fittings
JB/T 9626 Specification for Boiler Forging
JB/T 10087 Specifications for steel casting of steam turbines for pressure purposes
YB/T 5264 Corrosion-resisting Alloy Forging
YB/T 5353 Hot-rolled Plates of Corrosion-resisting
YB/T 5354 Cold-rolled Sheets of Corrosion-resisting Alloy
3 Terms and Definitions
For the purpose of this Standard, those defined in GB/T 3375 and the following terms and definitions apply.
3.1
Welding procedure qualification
Assessment of test process and result carried out to verify the correctness of the proposed welding procedure of weldment.
In this Standard, the welding procedure qualification refers to the process to carry out verifying test and result assessment for preliminary welding procedure specification, in order to make the mechanical property and bending property of welded joints or the chemical compositions of overlaying meet the requirements.
Document of welding procedure proposed for welding procedure qualification.
3.3
Procedure qualification report (PQR)
Report recording verifying test and inspection result and assessing proposed pWPS.
3.4
Welding procedure specification (WPS)
Document of welding procedure prepared according to qualified PQR and for product welding.
3.5
Welding working instruction (WWI)
Detailed working document for processing and operation concerning weldment manufacturing. The operation instructions applied by welder in welding, which can guarantee the reproducibility of welding quality.
Contents Foreword i 1 Scope 2 Normative References 3 Terms and Definitions 4 General 5 Welding Procedure Qualification Factors and Classification 6 Butt Weld and Fillet Weld Welding Procedure Qualification 7 Anticorrosive Overlaying Procedure Qualification Appendix A (Informative) Flow Diagram of Welding Procedure Specification Appendix B (Normative) Additional Regulations for Base Metal, Filler Metal and Welding Technique Appendix C (Normative) Welding Procedure Qualification for Composite Metallic Materials Appendix D (Normative) Welding Procedure Qualification and Supplementary Welding Procedure Qualification for Heat Exchange Tube and Tube Plate Appendix E (Normative) Stud Arc Welding Procedure Qualification Appendix F (Informative) Recommended Format of Welding Procedure Qualification Table Appendix G (Informative) Common English Abbreviations and Codes for Welding Procedure Qualification
