Hoisting Machinery Welding Procedure Qualification Criteria Analysis and Recommendations

By JGJ81 -2002 《Technical Specification for Welding in Steel Building Structures》, JB4708 -2000 《steel pressure vessel welding process planning》《steam boiler safety and technical supervision order》Appendix Ⅰ and other welding procedure qualification standards in the process of lifting machinery manufacturing application, analysis of differences between the various standards of welding procedure qualification for enterprise implementation at a loss, it is recommended as soon as possible a unified standard of welding procedure qualification.