简介：Inthispaper,anumericalinvestigationaboutthemetaltransferofGMAWisinvestigatedbasedonthephasefieldmodel.Bedifferentofmostpublishedwork,wetakethethermocapillaryeffectandmixtureenergyintotheprocessofphasetransferandinterfacechangewhichisdifferentfromvolumeoffluid(VOF)method.Wediscretizethewholemodelwithacontinuousfiniteelementmethodandwealsoapplyapenaltyformulationtothecontinuityconditionenhancingthestabilityofthepressure.MetaltransferofGMAWwithconstantandpulsecurrentiscomputedasnumericalexampleswhichagreeswellwiththedataofhigh-speedphotography.Theresultshowsthatthecomputingprocessofthephasefieldmodelisstabilityandithasahigherprecisioninpredictingthediameterofdroplet.
简介：Inthiswork,thewettability,agingandshearpropertiesofanewtypeoflead-freesolderpasteSn-07Ag-05Cu+BiNi(SACBN07)wasinvestigatedbyconductingaseriesofcomparisonexperimentswithSAC305andSAC0307solderpaste.TheresultsshowthatwettabilityofSACBN07isalmostequaltoSAC305,andbetterthanthatofSAC0307solderpaste.Thethicknessofintermetalliccompound(IMC)layerinSACBN07/Cuislowerthanthatofothertwotypesofsolderjointafteraging.AndCu_3SnlayerofSACBN07/CuisthinnerthanthatofSAC305andSAC0307.Inaddition,theSACBN07solderjointsperformthebestshearstrengthamongthesethreetypesofsolderpastes.
简介：Fromtheviewpointofweldingmechanics,twonewweldingmethods-weldingwithtrailingpeeningandweldingwithtrailingimpactiverollingwereintroduced.Foraluminumalloythin-shellstructureswithhighstrength,weldingwillleadtohotcracking,poorjointanddistortion.Inordertosolvethem,trailingimpactivedevicewasusedbehindweldingtorchtoimpactthedifferentpositionsofweldedjoints,thusrealizingtheweldingwithfree-hotcracking,lowdistortionandjointstrengthening.Byuseofimpactiverollingwheelsinsteadofpeeningheads,theoutlookofweldedspecimencanbeimprovedandstressconcentrationatweldtoescanbereduced.Equipmentofthistechnologyissimpleandportable.Itcanusedtoweldsheets,longitudinalandring-likebeamsoftube-likestructures,aswellasthethin-shellstructureswithclosedweldssuchasflangesandhatches.Sothetechnologyhasthewideapplicationforegroundinthefieldsofaviationandaerospace.
简介：AnewsimulationmodelofCO2short-circuitingtransferweldingmaybeemployedtodevelopanewpatternofweldingmachineandtopredictweldingprocessparameterstoobtaintheoptimumweldingtechnologyproperties.Inthispaper,anewsimulatingmodelisdevelopedaccordingtotheAWP(adaptingweldingphysicsprocess)waveformcontrolmethod.Goodagreementisshownbetweenthepredictedandexperimentallydeterminedresults.ThemodelwillmakeanimportantpromotioninthedevelopmentofCO2arcweldingtechnique.
简介：Thepapergivesananalysisontechnicalcharacteristicsofrepairtechniquesforfrictionstirweldingdefects.Toovercomethedefects,anewrepairtechnique,inertiafrictionpullplugwelding(IFPPW),wasresearchedanditsequipmentwasdevelopedaswell.ElementarydatumwasachievedbyinvestigatingtheinfluencesoftechnologicalparametersonmechanicalpropertiesandbyanalyzingthestructuralcharacteristicsofrepairjointwithIFPPW.ThestudyshowsthatthestabilityandreliabilityofweldingprocessofIFPPWcanbeguaranteedthroughtheconstantenergyfromtheflywheel.Integratedwiththeadvantagesoffrictionpullplugwelding,theIFPPW,freefrombackanvil,isconsideredasapromisingtechniqueinrepairofterminationkeyholeofbobbintoolfrictionstirweldingandpoint-likedefectsinaluminumalloywelding.
简介：Inthispaperanewmethodforpreventingweldinghotcracking—theinversestrainmethod(ISM)isdevelopedontheprincipleofweldingmechan-ics.EffectivenessandfeasiblityofmethodinpreventingweldinghotcrackingofhighstrengthaluminumalloyLY12CZbysynchronousrollingduringwelding(SRDW)alongbothsidesoftheweldatasuitabledistancebehindtheweldingarcareexamined.ExperimentalresulteindicatethatweldinghotcrackingofLY12CYcanbeeffectivelypreventedandthemechanicalpropertiesofweldedjointcanalsobeimprovedbythemethod.Itisanimportantnewsolutionforpreventinghotcrackinginweldingofsheetmetal.
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