AWS B2.1.4.220 : 1999
AWS B2.1.4.220 : 1999
STANDARD WELDING PROCEDURE SPECIFICATION (SWPS) FOR GAS TUNGSTEN ARC WELDING (CONSUMABLE INSERT ROOT) OF CHROMIUM-MOLYBDENUM STEEL (M-4/P-4, GROUP 1 OR 2), 1/8 THROUGH 1/2 IN. THICK, AS-WELDED CONDITION - 1/8 THROUGH 3/4 IN. THICK, PWHT CONDITION, IN515 AND ER80S-B2, PRIMARILY PIPE APPLICATIONS
American Welding Society