nitrogen purge blk steel pipe S.M.A.W. welding
nitrogen purge blk steel pipe S.M.A.W. welding
(OP)
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. SFA 5.1, AWS E6010 uphill& spec no 5.5 AWS E7018 uphill etc..???Why would nitrogen purge be used for this procedure ? Cannot find "code" ref that supports the use of nitrogen purge for these circustances. Reply to....
billvidmar@cobbmechanical.com
billvidmar@cobbmechanical.com





RE: nitrogen purge blk steel pipe S.M.A.W. welding
RE: nitrogen purge blk steel pipe S.M.A.W. welding
presence as an example mothballing to avoid corrosion and
TIG welding to ovoid oxidation of the root pass.
2. Nitrogen Purging is not a welding parameter applicable to SMAW
or any other welding process that ulizes coated welding
consumables or flux. (As far as I am concerned) However,
I would agree that it does good.
3. Nitrogen Purging is required while welding any pipeline with
traces of hydrocarbons as a safety measure.
General:
If the weldment quality was of grave importance XX18 electrode should of been used exclusively.
Cheers,
RE: nitrogen purge blk steel pipe S.M.A.W. welding
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