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1、WELDINGRESEARCH/9SUPPLEMENTTOTHEWELDINGjOURNAL,jULY1993-SponsoredbytheAmericanWeldingSocietyandtheWeldingResearchCouncilMetalTransferinPulsedCurrentGasMetalArcWeldingAstaticforcebalanceanalysiswasusedtoestimatethemeltingratesoftheelectrodesduringpulsedgasmetalarcweldingBYYe-S.KIMAN
2、DT.W.EAGARABSTRACT.Inordertoachieveoneandisshowntobeduetotaperingofwithshallowpenetration.Recentirn-...,..).-.,....,.,..&;,:.-...~dropperpulseoperationalconditionstheelectrodetipathighweldingcur-provementsinpowersupplydesignsusingwithpulsedcurrentGMAW,itisnec-rents.transistororfre
3、quencyconvertercontrolsessarytocontrolboththedropsizeatalsoprovidebettercontrollabilityofthethepeakcurrentandthemeltingrateofIntroductionprocess(Ref.2).theelectrode.Inthisstudy,astaticforce?ulsingthecurrentintroducesaddi-balanceanalysiswasusedtopredicttheSincetheintroductionofpulse
4、dcur-tionaloperationalparameters,whichin-dropletsizeatthepeakcurrentandarentGasMetalArcWelding(GMAW-P)cludepeakcurrent,basecurrent,peakweightedsumofthemeltingratesmea-in1962(Ref.I),thismethodofweldingpulsetime,andbasepulsetime,inaddi-suredunderDirectCurrentElectrodehasbeenusedwidel
5、ybothinmechanizedtiontothevariablesofDCwelding,whichPositive(DCE?)weldingwasemployedweldingandinroboticwelding.Withincludeelectrodeextension,weldingcur-toestimatethemeltingratewithpulsedpulsedGMAW,astablespraymetaltrans-rentandweldingvoltage.Theseextravari-current.Combiningthestati
6、cforcebal-fermodecanbeobtainedatlowaverageablescausedifficultyinselectingoptimumanceanalysisandtheweightedsumcurrentsthatwouldotherwiseproduceoperatingconditionsforpulsedcurrentmethod,amodelisproposedtopredictglobulartransferwithlargesporadicdrops.welding.Atrial-and-errormethodisof
7、tentheoptimalconditionsofonedropperPulsingleadstostablespraymetaltrans-usedtodeterminetheseconditions.How-pulseoperation.Themodelisfoundtoferandformationofauniformbeadshapeever,thebasicphysicsofmetaltransferinbeingoodagreementwiththeexperi-pulsedcurrentweldingneedstobeun-mentalresu
8、ltswhenthebasecurrentderst
