B2.1-5A-226:2022 STANDARD WELDING PROC SPEC (SWPS) FOR GAS TUNGSTEN ARC WELDING (CONSUM INSERT ROOT) FOLLOWED BY SHIELDED METAL ARC WELDING OF CHROMIUM-MOLYBDENUM STEEL (M-5A/P-5A), IN521, ER90S-B3, AND E9018-B3, 1/8 THRU 1/2 IN THICK, AS-WELDED; 1/8 THRU 1-1/2 IN THICK, PWHT

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This standard contains the essential welding variables for chromium-molybdenum steel in the thickness range of 1/8 inch [3 mm] through 1/2 inch [13 mm] in the as-welded condition; or 1/8 inch [3 mm] through 1-1/2 inch [38 mm] in the postweld heat treated (PWHT) condition, using manual gas tungsten arc welding with a consumable insert root, followed by shielded metal arc welding. It cites the base metals and operating conditions necessary to make the weldment, the filler metal specifications, and the allowable joint designs for groove welds. This standard welding procedure specification (SWPS) was developed primarily for pipe applications.