AWS B2.1-1-021 : 2018 Title: STANDARD WELDING PROCEDURE SPECIFICATION(WPS) FOR; GAS TUNGSTEN ARC WELDING FOLLOWED BY SHIELDED METAL ARC WELDING OF CARBON STEEL(M-1/P-1/S-1, GROUP 1 OR 2), 1/8 THROUGH 1-1/2 INCH THICK, ER70S2 AND E7018, AS-WELDED OR PWHT CONDITION Year: 2018 Publisher: American Welding Society Availability: Within 1-2 working days