Aws B21 4 2202021 Standard Welding Procedure Specification Swps For Gas Tungsten Arc Welding Consumable Insert Root Of Chromium Molybdenum Steel M 4 P 4 Group 1 Or 2 In515 And Er80s 82 1 8 Inch 3 Mm Through 1 2 Inch 13 Mm Thick As Welded Condition 1 8 Inch 3 Mm Through 3 4 Inch 19 Mm Thick Pwht Condition Primarily Pipe Applications

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