Definition: Welding procedure qualification to verify the proposed weldment welding process correctness or welder skills assessment test procedures carried out and the results evaluated. Objective: 1. Evaluation of welding unit welding ability to meet the relevant national or industry standards, technical specifications required by the welded joints 2. Verify that the welding process instructions prepared by welding units are correct 3. To develop a formal welding guide book or welding process card technology to provide a reliable basis for the assessment of welders ability 4. Significance: welding process is an important measure to ensure the quality of welding, it can be recognized as correct and rationality welding process instructions prepared by a variety of welded joints. By welding procedure qualification testing in accordance with the formulation of the welding process instructions welded using properties of welded joints with the design requirements and provide a reliable basis for the formal development of the welding process instructions or welding process card. Scope: 1, for the manufacture, installation and maintenance of boilers, pressure vessels, pressure piping, bridges, shipbuilding, aerospace, nuclear power and load-bearing steel and other steel equipment. 2, for gas welding, arc welding, TIG welding, MIG welding, submerged arc welding, plasma arc welding, electroslag welding and other welding methods. Technology assessment process: 1, welding procedure qualification 2, proposed welding procedure of item 3, 4 draft welding technology program, welding procedure qualification test 5, the preparation of the welding procedure qualification report 6, the preparation of welding procedures (process card process card operating instructions Book) assessment process: 1, prepare preliminary welding process instructions (preliminary Welding Procedure Specification, referred pWPS) 2, welding specimen and preparation of samples 3, 4 test specimens and samples, determination of welded joints meets the criteria 5 performance requirements proposed welding procedure qualification report prepared for welding process instructions to be assessed Assessment Reference Standard: Standard procedure qualification of domestic standards NB / T47014-2011 "pressure equipment welding procedure qualification" GB50236-98 "field devices , industrial pipe welding engineering construction and pressure pipeline technology assessment "" Steam Boiler Safety Technology Supervisory Regulations (1996), "Note: the lifting industry technology assessment borrow this standard SY / T0452-2002" oil pipeline welding procedure qualification method "(Note : for petroleum, chemical technology assessment) JGJ81-2002 "construction steel welding procedures" (Note: highway bridge assessment process can be implemented by reference) SY / T4103-1995 (equivalent to API 1104) European standard EN 288 or ISO 15607 - ISO 15614 series of standards ISO15614-1 steel arc and gas welding / nickel and nickel alloys ISO15614-2 arc welding of aluminum and aluminum alloy electric arc welding ISO15614-3 ISO15614-4 cast aluminum repair welding of titanium and titanium alloys ISO15614-5 Arc welding / zirconium and zirconium alloys electric arc welding ISO15614-6 copper and copper alloy welding ISO15614-8 ISO15614-7 fittings and tube sheet welding joints American Standard AWS D1.1 / D1.1M: 2005 Steel Structural Welding procedure D1.2 / D1.2M: 2003 aluminum sheet steel structure welding procedure D1.3-98 welding procedure D1.5 / D1.5M: 2002 Bridge welding D1.6: 1999 stainless steel welded D14.3 / D14. 3M: 2005 Lifting welding procedure