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  1. downhillbill

    nitrogen purge blk steel pipe S.M.A.W. welding

    gov spec requiring nitrogen purge while weld is being performed.gov spec ref's to ASME B31.1 and B31.9. Weld procedure QW-482 smaw, joint design vee,backing none,base metal (QW-403) P-# 1,,GRP # 1,Spec SA 106 GR-B,base metal .0625 to .436 all dia with in T range,,filler metals QW404,spec. no...

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