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The standard relies on a three-part documentation system to ensure weld integrity and repeatability:
You can purchase official ASME codes and standards directly from the ASME Digital Store as secure PDFs or in print. Before buying, always check that you are acquiring the most up-to-date edition, as ASME issues a new edition of the BPVC every two years, with the 2025 edition now available.
| Aspect | ASME (Section IX) | AWS (e.g., D1.1) | | :--- | :--- | :--- | | | Pressure vessels, boilers, nuclear piping | Structural steel (buildings, bridges, cranes) | | Qualification philosophy | Performance-based; PQR proves mechanical properties | Often prequalified WPSs allowed | | Who enforces | Authorized Inspector (AI) from ASME | Owner's engineer or building code official | | Toughness testing | Typically required for many services | Only if specified by contract |
A WPS is a written document that provides direction to the welder. It includes:
: Covers power piping systems (typically found in electric power generating stations) and their associated welding requirements. Personnel Certification & Maintenance
While the WPS qualifies the procedure, the WPQ qualifies the welder. It is a demonstration that a welder has the skill and manual dexterity to produce a sound weld using a specific, already-qualified WPS. The welder performs a test on a qualification coupon, which is then examined (often visually and through bend tests or radiography). If the test coupon meets the acceptance criteria, the welder is considered qualified to use that WPS within the limits defined by the essential variables for welder performance.
Changing the groove design (e.g., changing a V-groove angle). Changing the size of the welding electrode or nozzle.
The standard relies on a three-part documentation system to ensure weld integrity and repeatability:
You can purchase official ASME codes and standards directly from the ASME Digital Store as secure PDFs or in print. Before buying, always check that you are acquiring the most up-to-date edition, as ASME issues a new edition of the BPVC every two years, with the 2025 edition now available. welding standard asme
| Aspect | ASME (Section IX) | AWS (e.g., D1.1) | | :--- | :--- | :--- | | | Pressure vessels, boilers, nuclear piping | Structural steel (buildings, bridges, cranes) | | Qualification philosophy | Performance-based; PQR proves mechanical properties | Often prequalified WPSs allowed | | Who enforces | Authorized Inspector (AI) from ASME | Owner's engineer or building code official | | Toughness testing | Typically required for many services | Only if specified by contract | The standard relies on a three-part documentation system
A WPS is a written document that provides direction to the welder. It includes: It includes: : Covers power piping systems (typically
: Covers power piping systems (typically found in electric power generating stations) and their associated welding requirements. Personnel Certification & Maintenance
While the WPS qualifies the procedure, the WPQ qualifies the welder. It is a demonstration that a welder has the skill and manual dexterity to produce a sound weld using a specific, already-qualified WPS. The welder performs a test on a qualification coupon, which is then examined (often visually and through bend tests or radiography). If the test coupon meets the acceptance criteria, the welder is considered qualified to use that WPS within the limits defined by the essential variables for welder performance.
Changing the groove design (e.g., changing a V-groove angle). Changing the size of the welding electrode or nozzle.
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