AWS B2.1-1-002-90 (R2006)

STANDARD WELDING PROCEDURE SPECIFICATION (WPS) FOR GAS TUNGSTEN ARC WELDING OF CARBON STEEL, (M-1/P-1, GROUP 1 OR 2), 3/16 THROUGH 7/8 INCH, IN THE AS-WELDED CONDITION, WITH OR WITHOUT BACKING
standard by American Welding Society, 12/18/1989