Mechanical properties and microstructure of pure nickel PAW and PAW-TIG welded joints-中国期刊网

摘要 Aplasmaarcwelding(PAW)-tungsteninertgas(TIG)hybridweldingprocessisproposed.AndthispaperinvestigatedthemicrostructureandpropertiesofpurenickelN6jointsbyPAW-TIGhybridwelding.ComparedwiththeconventionalPAWmethod,thecharacteristicofPAW-TIGweldingprocessisthatthereisnointeractionbetweenthetwoarcs.TheadditionofTIGcanenhancetheintrinsichigh-efficiencypeculiarityandthestabilityofthekeyholestatusofPAW.ThejointsmadeusingPAWandPAW-TIG,respectively,weresubjectedtomicrostructuralevaluationsandtensiletestingsoastoanalyzetheeffectofTIGarcenergyonthemicrostructureandmechanicalpropertiesofthesejoints.Theresultsofthisinvestigationindicatethatsignificantgraincoarseningwasobservedintheweldmetal(WM)andheataffectedzone(HAZ)anditisfoundthattheextentofgraincoarseningincreasedwiththeadditionofTIGarc.Andthemicrostructureinhybridjoint,withwiderweldwidthandthesmoothsurface,iscoarserthaninPAWjoint.Furthermore,themicrohardnessandultimatetensilestrength(UTS)ofhybridjointisslightlylowerthanthatofPAWjoint.ThefractographobservationshowsthatthefracturingmechanismofPAWjointsductile,whilethehybridweldingjointsexistsasbrittle-ductilefracturemode.Theoutcomeofthisworkshowsthatintheconditionofsamedepositedrate,TIGarcpost-weldheattreatmentcanimprovetheweldingefficiencyandweldingspeed.TheproposedPAW-TIGhybridweldingprocessisdemonstratedtobesuitableforweldingnickelanditsalloysinindustryapplication.

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Mechanical properties and microstructure of pure nickel PAW and PAW-TIG welded joints

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Mechanical properties and microstructure of pure nickel PAW and PAW-TIG welded joints

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