Base metals selections for WPS (ASME IX)

Base metal used for procedure qualification shall detailed in the table QW-422. In case of material do not list in table QW-422, so it consider to be unassigned metal.
Any change P-Number shall be required to requalification WPS.

Assigned metal number: listed in table QW-422
Unassigned metal number: not shown in table QW-422.

We need to know about base metal used for procedure qualification coupon (LIFT COLUMN) and base metal qualification (RIGHT COLUMN) as detailed in table QW-424.1.

The same an assigned P-Number

Left column: One metal from a P-number to any metal from the same P-number.

Right column: Any metals assigned that P-Number.

Ex. PQR qualified for ASTM A106-B to ASTM A106B (P-No.1), the welding procedure shall qualify for ASTM A105N/ A234-WPB, A516 Gr. 60 to ASTM A105/ EN 10025-2 S235JR of any the same P-number , vice versa. This PQR shall not qualify for ASTM A106-B (P-No. 1) to ASTM A312 TP316 (P-No. 8).

The different an assigned P-Number

Left column: One metal from a P-number to any metal from any other P-number.

Right column: Any metals assigned the first P-Number to any metal assigned the second P-number.

Ex. PQR qualified for ASTM A106-B (P-No.1) to ASTM A312 TP316 (P-No.8), the welding procedure shall ONLY qualify for P-No.1 to P-No.8 and vice versa.

This PQR shall not qualify for P-No. 8 to P-No.8.

The unassigned P-Number to any P-Number

Ex. PQR qualified for API 5L Gr. B (P-No.1) to AISI Gr. 4130 (Unassigned P-Number), the welding procedure shall ONLY qualify for P-No.1 to AISI Gr. 4130 and vice versa.

This PQR shall not qualify for P-No. 1 to AISI Gr. 4137, 4140, 4145Hmod due to different the unassigned metal.

The unassigned P-Number to other unassigned P-Number

Ex. PQR qualified for AISI Gr. 4140 (Unassigned P-Number) to AISI Gr. 4130 (Unassigned P-Number), the welding procedure shall ONLY qualify for AISI Gr. 4140 to AISI Gr. 4130 and vice versa.

This PQR shall not qualify for AISI Gr. 4140 to AISI Gr. 4140 or 4145, 4137 due to different the second unassigned metal.

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