Welding Procedure Qualification (Welding Procedure Qualification, referred to as WPQ) in order to verify the correctness of the proposed welding process for the welding of weldments and the evaluation of the results of the test process. Welding procedure qualification is an important measure to ensure quality, for the formal development of welding procedure guide or welding procedure card to provide a reliable basis.

Welding process is an important measure to ensure the quality of welding, it can confirm the correctness and reasonableness of the welding process for a variety of welding joints prepared by the welding process instructions. Through the welding process evaluation, test according to the proposed welding process instruction book welded welded joints whether the use of performance in line with the design requirements, and for the formal development of welding process instruction book or welding process card to provide a reliable basis.

Evaluation process

1, the development of preparatory Welding Procedure Specification (preliminary Welding Procedure Specification, referred to as pWPS).

2、Specimen welding and specimen preparation.

3, test pieces and specimens.

4, determine whether the welded joints to meet the standard required performance.

5, the welding process evaluation report on the proposed welding process guidelines for evaluation.

Purpose of evaluation

1、Assess whether the welding unit has the ability to weld the welded joints in accordance with the relevant national or industry standards and technical specifications.

2、Verify whether the welding procedure (WPS or pWPS) formulated by the welding unit is correct.

3, for the development of formal welding process instructions or welding process card to provide a reliable technical basis.