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1、西北工业大学S学硕士学dil.论文ABSTRACTFrictionStirwelding(FSW)isarelativelynewsolidstatejoiningprocess,Itissaidtobe"themostrevolutionaryjoiningmethodafterLaserWelding".Comparedwiththeconventionalweldingprocesses,frictionstirweldsshowlittledeformationandlowresidualstress,andhasgoodmechanicalpro
2、perties.Therefore,alotofFSWexperimentsonmanymaterialswerecarriedouttoobtainmorepowerfulweldsBecauseofhighthermalconductivity,weldingofcopperanditsalloysisusuallydifficult勿conventionalfusionweldingprocesses,Theheatinputrequiredismuchhigherthanthatinalmostothermaterials,andtheweldin
3、gspeedisquitelow.Thus,studyingthefeasibilityofFSWforjoiningcopperanditsalloysisofgreatimportance.Inthestudy,purecopper(T2)andbrass(H62)whichhas3mminthicknesswereweldedbyFSWWiththemicrostructureofthewelds,microhardnessprofilethroughtheweldzoneandcorrespondingtensilestrengthtestdata
4、,theshapeanddimensionofthetool,thetravelspeed,thetoolrotationspeedandtheweldingpressurewereoptimized.Thestirzoneshowedfineandequaxiedgrainstructure,andthetensilestrengthoftheweldisequalorhigherthanthatofthepurecopperbasemetal.Theheattransferprocessdeterminesthethermalcyclesinthewo
5、rkpieceduringtheFSW,whichaffectsthemicrostructureandmechanicalproperties.Agoodunderstandingoftheheattransferprocessintheworkpiececanbehelpfulinpredictingtheresidualstressintheweldingworkpieceandthehardnessintheweldzone.Athree-dimensionalheattransfermodelbasedonthetoolshapeforFSWis
6、presentinthispaper.WiththeANSYSfiniteelementsoftwareandthelimitedmeasuredtemperaturedata,thetemperaturedistributionof6mmthickpurecopper(T2)frictionstirweldwasanalyzed.Heattransferatthebotomsurfaceoftheweldingworkpieceandthetemperature-dependentthermalconductivityofthematerialwerec
7、onsideredinthemodel.ThenumericalresultsareingoodagreementwiththeexperimentalresultsKeywords:frictionstirweldingcopperanditsalloysmicrostructureheattransferprocessfiniteelement.H.西北工业大学工学硕士学位论文第一章绪论1.1引言焊接作为制造业的基础加工工艺与技术在20世纪为工业经济的发展做出了重要的贡献。在人类引以为豪的各个领域，如航空航天、核能利用、电子信息、海洋钻探、高层建筑等，
8、都利用了焊接技术的优秀成果。新材料的出现对焊接技术提出了新的课题，
