AWS B2.1-4-221:1999 (R2009)

Wps:Chromium Molybdenum Steels, Primarily Pipe Applications (M-4/P-4, Group 1 or 2) – Gtaw (Consumable Insert Root) Followed by Shielded Metal Arcwelding of Chromium-Molybdenum Steel (M-4/P-4, Group 1 OR 2), 1/8 Through 1/2 Inch Thick, As-Welded Condition
standard by American Welding Society, 01/01/1999

AWS B2.1-4-217:1999 (R2009)

Standard Welding Procedure Specification (WPS) for Gas Tungsten Arc Welding of Chromium- Molybdenum Steel (M-4/P-4, Group 1 or 2), ER80S-B2, 1/8 through 1/2 in. Thick, As-Welded Condition, 1/8 through 3/4 in. Thick, PWHT Condition, Primarily Pipe Applications
standard by American Welding Society, 12/08/1999

AWS A4.2M:2020

Standard Procedures for Calibrating Magnetic Instruments to Measure Delta Ferrite Content of Austenitic and Duplex Ferritic-Austenitic Stainless Steel Weld Metal (ISO 8249:2000 Mod.)
standard by American Welding Society, 01/01/2020