When qualifying a weld procedure, essential variables must be recorded on which documents?

When qualifying a weld procedure, essential variables must be recorded on which documents?

• A. WPS only
• B. PQR only
• C. Both WPS and PQR
• D. Welders' qualification record

Answer: (C)

Essential variables are the settings that define how a weld procedure is performed and must be controlled and documented during procedure qualification. The procedure qualification record (PQR) captures the actual tests and the specific variables used—materials, thickness, welding process, filler metal, position, preheat/interpass/post-weld heat treatment, heat input, and related conditions. The Weld Procedure Specification (WPS) used in production must reflect the same essential variables so that manufacturing welds follow the proven, qualified procedure and there is a clear link back to the test results. Since the WPS is derived from the PQR, both documents carry the essential variables to ensure traceability and compliance. The welder qualification record, on the other hand, is about the welder’s capability, not the procedure’s variables.

Essential variables are the settings that define how a weld procedure is performed and must be controlled and documented during procedure qualification. The procedure qualification record (PQR) captures the actual tests and the specific variables used—materials, thickness, welding process, filler metal, position, preheat/interpass/post-weld heat treatment, heat input, and related conditions. The Weld Procedure Specification (WPS) used in production must reflect the same essential variables so that manufacturing welds follow the proven, qualified procedure and there is a clear link back to the test results. Since the WPS is derived from the PQR, both documents carry the essential variables to ensure traceability and compliance. The welder qualification record, on the other hand, is about the welder’s capability, not the procedure’s variables.