1996AWS B2.1-1-207-1996 Standard Welding Procedure Specification (WPS) for Gas Tungsten Arc Welding of Carbon Steel (M-1/P-1/S-1, Group 1 or 2), 1/8 Through 1-1/2 Inch Thick, ER70S-2, As- Welded or PWHT Condition (Primarily Pipe Applications) Site License