AWS B2.1-4-219 : 2021 Title: STANDARD WELDING PROCEDURE SPECIFICATION(WPS) FOR; GAS TUNGSTEN ARC WELDING FOLLOWED BY SHIELDED METAL ARC WELDING OF CHROMIUM- MOLYBDENUM STEEL(M-4/P-4, GROUP 1 OR 2), 1/8 THROUGH 1/2 IN.THICK Year: 2021 Publisher: American Welding Society Availability: Within 1-2 working days