Which code governs weld procedure qualification for piping?

Which code governs weld procedure qualification for piping?

• A. AWS D1.1
• B. ASME Section IX
• C. API 570
• D. ASME B31.3

Answer: (B)

Weld procedure qualification is all about proving that a welding procedure can consistently produce sound welds under the defined conditions. The standard that governs this process is ASME Section IX. It lays out how to qualify a Welding Procedure Specification (WPS) and the related Procedure Qualification Record (PQR), including which welding variables must be controlled, what test coupons are needed, and what acceptance criteria the welds must meet. In piping work, ASME B31.3 requires that welds be qualified in accordance with Section IX, so Section IX is the governing code for the qualification itself. The other codes mentioned—AWS D1.1, API 570—address different scopes (structural welding, and inspection/maintenance scope, respectively) and do not govern WPQ.

Weld procedure qualification is all about proving that a welding procedure can consistently produce sound welds under the defined conditions. The standard that governs this process is ASME Section IX. It lays out how to qualify a Welding Procedure Specification (WPS) and the related Procedure Qualification Record (PQR), including which welding variables must be controlled, what test coupons are needed, and what acceptance criteria the welds must meet. In piping work, ASME B31.3 requires that welds be qualified in accordance with Section IX, so Section IX is the governing code for the qualification itself. The other codes mentioned—AWS D1.1, API 570—address different scopes (structural welding, and inspection/maintenance scope, respectively) and do not govern WPQ.