AWS B2.1-4-218:1999

Standard Welding Procedure Specification (WPS) for Shielded Metal Arc Welding of Chromium-Molybdenum Steel (M-4/P-4, Group 1 or 2), E8018-B2, 1/8 Through 1/2 in. Thick As-Welded Condition, 1/8 Through 1-1/2 in. Thick, PWHT Condition, Primarily Pipe Applications

American Welding Society , 01/01/1999