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Adherence to ASME standards is not merely a best practice; in many jurisdictions, it is a legal requirement. The ASME certification marks (such as the "U" Stamp for pressure vessels or "S" Stamp for power boilers) signify that a manufacturer has a Quality Control System that enforces the welding standards.
To validate a WPS, the manufacturer must weld test coupons and document the results in a . The PQR is a record of the variables recorded during the welding of the test coupon and the results of the required tests (tensile tests and bend tests). welding standard asme
| Variable Type | Effect on WPS | Effect on Welder | |---------------|----------------|------------------| | | Changes require new PQR | Changes may require new WPQ | | Non-essential | Can change without new PQR | Not applicable | | Supplementary Essential (for impact testing) | Requires requalification | N/A | Adherence to ASME standards is not merely a