Moreover,in this article,with respect to the production situation of our factory,the welding procedure qualification,determination of welding process parameters and post heat treatment for 12Cr1MoV were described.

This paper analyses the principle and method of welding procedure qualification for joint between tube and tube plate in heat exchanger, and some problem emerging in the process of standard execution are put forward.

It includes the testing method,the process and the result of welding procedure qualification.

Introduces brand classifying,chemical composition and main characteristics of cobalt-base alloy used to deposit sealing surface for nuclear class valves,and various methods of deposition as well as welding technologic estimation.

Management data base system of welding procedure qualification record;

Abstract:This Paper introduces the problem of welding procedure qualification、welder performance qualification and postweld heat treatment in the valve manufacturing and inspection,analyzes the limitation of the present national standard for presuure vessel and pipeline when it is used in the valve manufacturing and inspection.

So the pipe board of exchanger that melamine's tail gas callback equipment need be overlayed 00Cr25Ni22Mo2 stainless steel,the article mainly constitute preciseness overlaying welding technics by welding procedure evaluation to satisfy the demand of the product,which lays the foundation for the welding of the type's product for the fu.

In this article, the author introduces the key factors of quality control during the welding procedure evaluation and the welding examination in detail.

This paper which is about the welding procedure qualification test of the SA213-T23 steel pipe,analysis the influence of post heat-treatment on the weld joint,and got the right welding process.