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外文翻译--摩擦搅拌焊接技术及其发展过程.doc

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外文翻译--摩擦搅拌焊接技术及其发展过程.doc

外文翻译毕业设计题目双搅拌轴搅拌摩擦焊机设计原文FIRCTIONSTIRWELDINGANDPROCESSING译文摩擦搅拌焊接技术及其发展过程(原文2)FIRCTIONSTIRWELDINGANDPROCESSINGABSTRACTFRICTIONSTIRWELDINGFSWISARELATIVELYNEWSOLIDSTATEJOININGPROCESSTHISJOININGTECHNIQUEISENERGYEFFICIENT,ENVIRONMENTFRIENDLY,ANDVERSATILEINPARTICULAR,ITCANBEUSEDTOJOINHIGHSTRENGTHAEROSPACEALUMINUMALLOYSANDOTHERMETALLICALLOYSTHATAREHARDTOWELDBYCONVENTIONALFUSIONWELDINGFSWISCONSIDEREDTOBETHEMOSTSIGNIFICANTDEVELOPMENTINMETALJOININGINADECADERECENTLY,FRICTIONSTIRPROCESSINGFSPWASDEVELOPEDFORMICROSTRUCTURALMODIFICATIONOFMETALLICMATERIALSINTHISREVIEWARTICLE,THECURRENTSTATEOFUNDERSTANDINGANDDEVELOPMENTOFTHEFSWANDFSPAREADDRESSEDPARTICULAREMPHASISHASBEENGIVENTOAMECHANISMSRESPONSIBLEFORTHEFORMATIONOFWELDSANDMICROSTRUCTURALREFINEMENT,ANDBEFFECTSOFFSW/FSPPARAMETERSONRESULTANTMICROSTRUCTUREANDFINALMECHANICALPROPERTIESWHILETHEBULKOFTHEINFORMATIONISRELATEDTOALUMINUMALLOYS,IMPORTANTRESULTSARENOWAVAILABLEFOROTHERMETALSANDALLOYSATTHISSTAGE,THETECHNOLOGYDIFFUSIONHASSIGNIFICANTLYOUTPACEDTHEFUNDAMENTALUNDERSTANDINGOFMICROSTRUCTURALEVOLUTIONANDMICROSTRUCTURE–PROPERTYRELATIONSHIPS2005ELSEVIERBVALLRIGHTSRESERVED1INTRODUCTIONTHEDIFFICULTYOFMAKINGHIGHSTRENGTH,FATIGUEANDFRACTURERESISTANTWELDSINAEROSPACEALUMINUMALLOYS,SUCHASHIGHLYALLOYED2XXXAND7XXXSERIES,HASLONGINHIBITEDTHEWIDEUSEOFWELDINGFORJOININGAEROSPACESTRUCTURESTHESEALUMINUMALLOYSAREGENERALLYCLASSIFIEDASNONWELDABLEBECAUSEOFTHEPOORSOLIDIFICATIONMICROSTRUCTUREANDPOROSITYINTHEFUSIONZONEALSO,THELOSSINMECHANICALPROPERTIESASCOMPAREDTOTHEBASEMATERIALISVERYSIGNIFICANTTHESEFACTORSMAKETHEJOININGOFTHESEALLOYSBYCONVENTIONALWELDINGPROCESSESUNATTRACTIVESOMEALUMINUMALLOYSCANBERESISTANCEWELDED,BUTTHESURFACEPREPARATIONISEXPENSIVE,WITHSURFACEOXIDEBEINGAMAJORPROBLEMFRICTIONSTIRWELDINGFSWWASINVENTEDATTHEWELDINGINSTITUTETWIOFUKIN1991ASASOLIDSTATEJOININGTECHNIQUE,ANDITWASINITIALLYAPPLIEDTOALUMINUMALLOYS1,2THEBASICCONCEPTOFFSWISREMARKABLYSIMPLEANONCONSUMABLEROTATINGTOOLWITHASPECIALLYDESIGNEDPINANDSHOULDERISINSERTEDINTOTHEABUTTINGEDGESOFSHEETSORPLATESTOBEJOINEDANDTRAVERSEDALONGTHELINEOFJOINTFIG1THETOOLSERVESTWOPRIMARYFUNCTIONSAHEATINGOFWORKPIECE,ANDBMOVEMENTOFMATERIALTOPRODUCETHEJOINTTHEHEATINGISACCOMPLISHEDBYFRICTIONBETWEENTHETOOLANDTHEWORKPIECEANDPLASTICDEFORMATIONOFWORKPIECETHELOCALIZEDHEATINGSOFTENSTHEMATERIALAROUNDTHEPINANDCOMBINATIONOFTOOLROTATIONANDTRANSLATIONLEADSTOMOVEMENTOFMATERIALFROMTHEFRONTOFFIG1SCHEMATICDRAWINGOFFRICTIONSTIRWELDINGTHEPINTOTHEBACKOFTHEPINASARESULTOFTHISPROCESSAJOINTISPRODUCEDIN‘SOLIDSTATE’BECAUSEOFVARIOUSGEOMETRICALFEATURESOFTHETOOL,THEMATERIALMOVEMENTAROUNDTHEPINCANBEQUITECOMPLEX3DURINGFSWPROCESS,THEMATERIALUNDERGOESINTENSEPLASTICDEFORMATIONATELEVATEDTEMPERATURE,RESULTINGINGENERATIONOFFINEANDRECRYSTALLIZEDGRAINS4–7THEFINEMICROSTRUCTUREINFRICTIONSTIRWELDSPRODUCESGOODMECHANICALPROPERTIESFSWISCONSIDEREDTOBETHEMOSTSIGNIFICANTDEVELOPMENTINMETALJOININGINADECADEANDISA‘‘GREEN’’TECHNOLOGYDUETOITSENERGYEFFICIENCY,ENVIRONMENTFRIENDLINESS,ANDVERSATILITYASCOMPAREDTOTHECONVENTIONALWELDINGMETHODS,FSWCONSUMESCONSIDERABLYLESSENERGYNOCOVERGASORFLUXISUSED,THEREBYMAKINGTHEPROCESSENVIRONMENTALLYFRIENDLYTHEJOININGDOESNOTINVOLVEANYUSEOFFILLERMETALANDTHEREFOREANYALUMINUMALLOYCANBEJOINEDWITHOUTCONCERNFORTHECOMPATIBILITYOFCOMPOSITION,WHICHISANISSUEINFUSIONWELDINGWHENDESIRABLE,DISSIMILARALUMINUMALLOYSANDCOMPOSITESCANBEJOINEDWITHEQUALEASE8–10INCONTRASTTOTHETRADITIONALFRICTIONWELDING,WHICHISUSUALLYPERFORMEDONSMALLAXISYMMETRICPARTSTHATCANBEROTATEDANDPUSHEDAGAINSTEACHOTHERTOFORMAJOINT11,FRICTIONSTIRWELDINGCANBEAPPLIEDTOVARIOUSTYPESOFJOINTSLIKEBUTTJOINTS,LAPJOINTS,TBUTTJOINTS,ANDFILLETJOINTS12THEKEYBENEFITSOFFSWARESUMMARIZEDINTABLE1RECENTLYFRICTIONSTIRPROCESSINGFSPWASDEVELOPEDBYMISHRAETAL13,14ASAGENERICTOOLFORMICROSTRUCTURALMODIFICATIONBASEDONTHEBASICPRINCIPLESOFFSWINTHISCASE,AROTATINGTOOLISINSERTEDINAMONOLITHICWORKPIECEFORLOCALIZEDMICROSTRUCTURALMODIFICATIONFORSPECIFICPROPERTYENHANCEMENTFOREXAMPLE,HIGHSTRAINRATESUPERPLASTICITYWASOBTAINEDINCOMMERCIAL7075ALALLOYTABLE1

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