B2.1-5A-225:2022 STANDARD WELDING PROCEDURE SPEC (SWPS) FOR GAS TUNGSTEN ARC WELDING (CONSUMABLE INSERT ROOT) OF CHROMIUM-MOLYBDENUM STEEL (M-5A/P-5A), IN521 AND ER90S-B3, 1/8 IN THRU 1/2 IN THICK, AS-WELDED CONDITION; 1/8 IN THRU 3/4 IN THICK, PWHT CONDITION, PRIMARILY PIPE APP

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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 3/4 inch [19 mm] in the postweld
heat treated (PWHT) condition, using manual gas tungsten arc welding with a consumable insert root. 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.