简介：ＳｉｔｕａｔｉｏｎｏｎｗｅｌｄｅｒｔｒａｉｎｉｎｇｉｎＣｈｉｎａ￥ＹＵＪｉｌｕｎ（ＨａｒｂｉｎＷｅｌｄｉｎｇＴｒａｉｎｉｎｇＣｅｎｔｅｒ（１５００４６））Ａｂｓｔｒａｃｔ：ＴｈｅｓｔａｔｅｏｆｗｅｌｄｅｒｓｔｒａｉｎｉｎｇｉｎＣｈｉｎａｉｓｉｎｔｒｏ...

简介：Ｐｒｅｓｅｎｔｓｉｔｕａｔｉｏｎａｎｄｆｕｔｕｒｅｏｆｗｅｌｄｉｎｇｍａｃｈｉｎｅｒｙｉｎｄｕｓｔｒｙ￥ＬＩＪｉａｎｇｕｏａｎｄＺＨＵＱｉ（ＣｈｅｎｇｄｕＥｌｅｃｔｒｉｃＷｅｌｄｉｎｇＭａｃｈｉｎｅＲｅｓｅａｒｃｈＩｎｓｔｉｔｕｔｅ（６１００５１））...

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简介：Theappliedconditionsofstudweldingononbodyofautomobile,andthecurrentwaveformsandsequencecon-troltechniqueswhicharesettomeetthequalityofstudweldingincarbody,areintroducedinthispaper.Therealiz-ingmethodofcurrentwaveformsandsequencecontrolbasedonmicroprocessorarealsodiscussedindetail,Thewaveformsofoutputweldingcurrentandvoltagearemeasured.Itisprovedthatthetechniquesincludingcurrentwaveforms&se-quencecontrolcansuccessfullymeetthedemandofautomobilestudwelding.

简介：Theeffectofweldingcurrentontheweldshapeandtensileshearloadduringlaserbeam-resistanceseamwelding(LB-RSW)ofaluminumalloy5052isstudied.Experimentalresultsshowthatthepenetrationdepth,weldwidth,tensileshearloadandtheratioofpenetrationdepthtoweldwidthofLB-RSWarebiggerthanthoseoflaserbeamwelding(LBW)underthesameconditionsandtheformerthreeparametersincreaseasweldingcurrentrises.TheweldshapeofLB-RSWbelow5kAweldingcurrentisnearlythesameasthatofLBW.Theweldmorphologyisprotuberantundertheconditionof5kAweldingcurrentand0.8m/minweldingspeed.Furthermore,themicrostructureoftheweldseamofLB-RSWiscoarserthanthatofLBW.

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.

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