AWS B2.1-1-235:2006
Standard Welding Procedure Specification (Swps) for Argon Plus 2 Oxygen Shielded Gas Metal Arc Welding of Carbon Steel (M-1/P-1/S-1) Groups 1 and 2, 1/8 through 1-1/2 inch Thick, ER70S-3, Flat Position Only, As Welded or PWHT Condition, Primarily Pipe Applications
standard by American Welding Society, 01/01/2006