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工艺参数对AA2524回填式搅拌摩擦点焊接头成形及力学性能的影响.docx

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工艺参数对AA2524回填式搅拌摩擦点焊接头成形及力学性能的影响 Title:TheImpactofProcessParametersontheFormabilityandMechanicalPropertiesofAA2524FrictionStirSpotWeldedJoints Introduction: Frictionstirwelding(FSW)isaninnovativesolid-stateweldingtechniquewidelyusedinvariousindustriesduetoitsabilitytojoindissimilaranddifficult-to-weldmaterials.OnespecificvariantofFSWisfrictionstirspotwelding(FSSW),whichinvolvesthecreationoflocalizedweldedjoints.AA2524aluminumalloy,knownforitsexcellentstrength-to-weightratio,isoftenusedinaerospaceandautomotiveapplications.ThispaperaimstoinvestigatetheinfluenceofprocessparametersontheformabilityandmechanicalpropertiesofAA2524frictionstirspotweldedjoints. 1.ProcessParameters: 1.1.RotationalSpeed: TherotationalspeedoftheFSSWtoolsignificantlyaffectsthematerialflowandheatgenerationduringtheweldingprocess.Higherrotationalspeedsintroducemoreheat,resultinginincreasedmaterialsofteningandenhancedplasticityintheweldzone.However,excessivelyhighrotationalspeedsmayleadtomaterialdefects,suchastunneldefects,andweakenthemechanicalpropertiesofthejoint. 1.2.WeldingSpeed: Theweldingspeedaffectstheheatinputandtheamountofplasticdeformationexperiencedbythematerial.Alowweldingspeedallowsmoretimeforheatdissipation,leadingtoreducedsofteningofthematerialandincreasedjointstrength.Conversely,higherweldingspeedsresultinlessheatdissipation,potentiallyleadingtomaterialdefectsandreducedmechanicalproperties. 1.3.Downforce: Thedownforce,oraxialforceappliedbytheFSSWtool,influencesthelevelofplasticdeformationandmaterialflowduringwelding.Anoptimaldownforceensuressufficientconsolidationofthematerialwhileavoidingexcessiveplasticdeformationthatmaynegativelyimpactthejoint'smechanicalproperties. 2.FormabilityofAA2524FSSWJoints: 2.1.BondingZone: Thebondingzone'sformability,characterizedbythejoint'smacrostructuralfeatures,isaffectedbytheprocessparameters.Anappropriatecombinationofrotationalspeed,weldingspeed,anddownforcepromotesauniformanddefect-freebondingzone,resultinginhigherjointstrength. 2.2.Microstructure