简介：Ｄｅｖｅｌｏｐｍｅｎｔｏｆｗｅｌｄｉｎｇｔｅｃｈｎｏｌｏｇｙｏｆｈｙｄｒｏｅｌｅｃｔｒｉｃｐｏｗｅｒｅｑｕｉｐｍｅｎｔ￥ＺＨＥＮＧＢｅｎｙｉｎｇ（ＤｏｎｇｆａｎｇＥｌｅｃｔｒｉｃａｌＭａｃｈｉｎｅｒｙＷｏｒｋｓ，ＳｉｃｈｕａｎＤｅｙａｎｇ（６１８００...

简介：Ｗｅｌｄｉｎｇｔｅｃｈｎｏｌｏｇｙｉｎｏｉｌ－ｆｉｅｌｄｃｏｎｓｔｒｕｃｔｉｏｎｉｎＣｈｉｎａ￥ＨＯＵＸｉａｎｚｈｏｎｇ（ＤａｑｉｎｇＯｉｌＦｉｅｌｄ）Ａｂｓｔｒａｃｔ：Ｔｈｉｓｐａｐｅｒｉｎｔｒｏｄｕｃｅｓｔｈｅａｐｐｌｉｃａｔｉｏｎａｎｄｄｅｖｅ...

简介：

简介：Thetenacityofheat-affectedzone(HAZ)willdeclineandthesizeofgrainswillincrease,becauseoftheoverheatingonHAZwhensubmergedarcwelding(SAW)isusedtothickplatewithhighheatinput.TheshapingwillworsenwhenSAWisusedtothinplatewithhighcurrentathighspeed.AnewSAWtechnology,thepulseddirectcurrent(DC)automaticSAW,willbeputforwardinthispaperinordertoovercometheaboveshortcomings.Andapulsedcontrollerwithmicro-controllerunit(MCU)asthecore,nixietube(NT)andkeyboardastheman-machineconversationinterfaceisdeveloped.Themainfunctionsofthepulsedcontrollerincludetheoutputofpulsedweldingcurrentandtheworkingwithtwinwire.Theresearchhaswidelyprospectsinapplicationwithsignificantmeaningsintheoryandpracticalengineering.

简介：ＤｅｖｅｌｏｐｍｅｎｔｏｎｍａｎｕｆａｃｔｕｒｉｎｇｔｅｃｈｎｏｌｏｇｙｏｆｒａｉｌｗａｙｌｏｃｏｍｏｔｉｖｅａｎｄｒｏｌｌｉｎｇｓｔｏｃｋｉｎｄｕｓｔｒｙｉｎＣｈｉｎａ￥ＷＡＮＧＫｅｊｉａ（ＣｈｉｎａＮａｔｉｏｎａｌＲａｉｌｗａｙＬｏｃｏｍｏｔｉｖ...

简介：ProblemsaboutsurfacemountingprocessforfinepitchdevicesandreasonsonsolderbridgingofLtypeleaddevicesweldedaredepicted.Bridgingmechanismandinfluencefactorsareanalyzedwithtwo-dimensionalgeometricmodel.Basedonthis,high-densitysurfacemounttechnology(SMT)forfinepitchLtypeleaddevicesheatedbyscan-ninglaserisraised.SurfacemountprocessforQFP208onprintedcircuitboard(PCB)isstudied.Theresultsoftestsarethatitisquitepossibletosolvethesolderbridgingofsurfacemountingforpitchdeviceswithscanninglaser-heat-ingmethod.

简介：

简介：

简介：Thecharacteristicsoftemperatures,stressesandstrainsfieldshavebeenstudiednumericallyforatitaniumalloysheetweldedwithanimprovedgastungstenarcweldingmethod,inwhichatrailingspotheatsinkisintroducedtocontroltheweldingstressanddistortion.Theimpingingjetmodelisemployedtodescribetheintenseheattransferbetweenthecoolingmediaandthetopsurfaceoftheworkpiece.Theinfluenceofthedistancebetweenarcandheatsinkisinvestigated.Resultsshowthatthereisanidealrangeofdistance.Usingtheidealdistance,alowstressandnodistortionweldingstructurecanbederived.

简介：Somepartswithcapillarytoplatejointhaveimportantapplicationinaerocraft.Vacuumelectronbeambrazing(VEBB)technologyisusedtorealizethisjointingwithcapillaries.Firstly3Dfiniteelementanalysismodelisbuiltinthispaperaccordingtothisspecialstructure.AndthenANSYSfiniteelementanalysissoftwareisusedtoanalyzebrazingtemperaturefieldatdifferentbrazingparameters.Thecalculationresultsshowthatthetemperaturefieldofsimulationhasgoodagreementwiththatmeasuredbyexperiment,whichprovesdependenceofthemodelbuiltinthispaper.Andalsoreferenceparameterscouldbeprovidedforrealbrazingprocessthroughcalculationinthismodel.BrazedjointofcapillarytoplatewithgoodperformanceisachievedusingVEBBtechnology.Theachievementofthestudywillbeappliedinaerocraftinthefuture.

简介：WeldingresearchofA6N01S-T5aluminumalloyprofileforhigh-speedtrainwasdonebyusinglaser-MIGhybridweldingandMIGweldingindividually.Andtheweldappearance,weldingdistortion,mechanicalpropertiesofthejointsandmicrostructureswereanalyzed.Thetestresultsdemonstratedthathigh-efficientweldingfortheprofilecanbeachievedbyusinglaser-MIGhybridwelding,thespeedofwhichcanbeover3.0m/min.Theprocessinghadagoodgapbridgingability，evenifthegapofthebuttjointwasupto2.0mm,agoodweldappearancecanalsobegot.Whilethehybridweldingspeedwasgreaterthan2.5m/min,theweldingdistortionofthelaser-tandemMIGhybridjointswasjustabout33%ofthatoftheMIGjoints,buttheweldingefficiencywasover3timesofMIGwelding.Andtensilestrengthofthehybridjointswas85%ofthatofA6N01S-T5basemetal,9%higherthanthatoftheMIGjoints.Fatiguepropertieswastestedindividuallywithpulsedtensilefatiguemethodintheconditionof1×107lifetime.Thetestresultsdemonstratedthatthefatiguestrengthofthejointswasalittlelowerthanthatofbasematerial,whichcouldbeupto115MPa.Butthefatiguestrengthofhybridweldingjointswas107.5MPa,whichwas23%higherthan87MPaofMIGweldingjoints.