In the field of materials science and engineering, Q345R is a widely used low-alloy high-strength structural steel, and the qualification of its welding procedures is a crucial step in ensuring the safe operation of critical equipment such as pressure vessels and pipelines.

Company Welding Procedure Qualification Number; Compilation, Review, Approval; List I: Welding Procedure Qualification Terms of Reference; total pages; II: Pre-welding Procedure Specification; total pages; III: Welding Procedure Qualification Report; total pages; IV: Appendices: Inspection and Material Reports; total pages

Case study: A shipyard discovered linear defects during ultrasonic testing (UT) of a test piece following welding. Analysis revealed that the defects were caused by excessive welding speed, resulting in lack of fusion. After adjusting the speed, the weld was re-performed and passed the assessment. Scope: A single WPS may be supported by multiple PQRs.

Case study: A shipyard discovered linear defects during ultrasonic testing (UT) of a test piece following welding. Analysis revealed that the defects were caused by excessive welding speed, resulting in lack of fusion. After adjusting the speed, the weld was re-performed and passed the assessment. Scope: A single WPS may be supported by multiple PQRs.

Case study: A shipyard discovered linear defects during ultrasonic testing (UT) of a test piece following welding. Analysis revealed that the defects were caused by excessive welding speed, resulting in lack of fusion. After adjusting the speed, the weld was re-performed and passed the assessment. Scope: A single WPS may be supported by multiple PQRs.

焊接工艺评定（PQR）是验证焊接工艺可行性的关键环节，它通过标准化试验和严格检测，确保焊接接头满足设计要求，是保障设备安全、提升产品质量的核心步骤。