A PQR prepared with an S-number is applicable to which material designations?

A PQR prepared with an S-number is applicable to which material designations?

• A. S-number only
• B. P-number only
• C. Either S-number or P-number
• D. Both S-number and P-number

Answer: (D)

A welding procedure qualification record (PQR) defines the scope of a qualified welding procedure in terms of the material groups it covers. In API 570, base metals are grouped for qualification in two ways: P-number, which groups materials by weldability characteristics, and S-number, which reflects service or weldability considerations for certain materials. When a PQR is prepared with an S-number, that record establishes a procedure qualified for the materials in that S-number group. Because S-numbers map to P-number groups and the same material families can be referenced by either designation, the qualified welding procedure is considered applicable to materials designated by either S-number or P-number. Therefore, the PQR prepared with an S-number can be used for both designations, making the answer that covers both designations the correct one.

A welding procedure qualification record (PQR) defines the scope of a qualified welding procedure in terms of the material groups it covers. In API 570, base metals are grouped for qualification in two ways: P-number, which groups materials by weldability characteristics, and S-number, which reflects service or weldability considerations for certain materials. When a PQR is prepared with an S-number, that record establishes a procedure qualified for the materials in that S-number group. Because S-numbers map to P-number groups and the same material families can be referenced by either designation, the qualified welding procedure is considered applicable to materials designated by either S-number or P-number. Therefore, the PQR prepared with an S-number can be used for both designations, making the answer that covers both designations the correct one.