August 15, 2019
Standard WPS for Gas Tungsten Arc Welding with Consumable Inserts 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" Thick, INMs-1, ER70S-2, and E7018, As-Welded or PWHT Condition, Primarily Pipe App.
standard by American Welding Society, 10/31/2001