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AWS B2.1.011-91

Standard Welding Procedure Specification for Shielded Metal Arc Welding of Galvanized Steel, 10 through 18 Gauge, in the As-Welded Condition, With of Without Backing
standard by American Welding Society, 01/01/1991

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