Tool-workpiece interaction and shear layer flow during

《Tool-workpiece interaction and shear layer flow during》由会员上传分享，免费在线阅读，更多相关内容在学术论文-天天文库。

1、Tool-workpieceinteractionandshearlayerflowduringfrictionstirweldingofaluminiumalloysZ.W.CHEN,S.CUIDepartmentofMechanicalandProductionEngineering,AUTUniversity,NewZealandReceived15July2007;accepted10September2007Abstract:Materialflowphenomenaduringfrictionstirwelding(FSW)a

2、ndtheformingmechanismof“onionrings”arecomplicatedandcurrentlynotfullyunderstood.InthepresentFSWstudyaluminiumalloys5083andA356,withthelattermorereadilyweldedthantheformer,wereused.Theexperimentswereconductedtoobtainsamplesoftoolandworkpiece“frozen”togetherduringFSWforanal

3、ysis.Twodepositionmodesforformingtheweldnuggetzonewereobserved,oneforeachalloywiththepresentFSWparameters.Thefirstisthedepositionofshearlayersformingthe“onionrings”in5083alloynugget.Thetool-workpieceinteractionleadingtothelayerthicknessbeingequaltotheratioofweldingspeedan

4、dtoolrotationspeedissuggested.ThesecondmodeisthecombinationofdepositingtherotationalshearmaterialinthelowerpartontheadvancingsideandthedragflowofmaterialfromtheretreatingsiteformingtherestoftheA356nugget.Thelattermoderesultedintheabsenceofaclearringstructure.Keywords:fric

5、tionstirwelding(FSW);deposition;nuggetzone;rotationandexamined.Inthesestudiesofusingmarkermaterial1Introductionand“frozen”tool-workpiece,somegeneralfeaturesofmaterialflowhavebeenidentified.Recently,wehaveFrictionstirwelding(FSW),inventedbyTWIindevelopedatechniqueforthepin

6、tobreakandembedin1991,isarelativelynewsolid-statejoiningandefficienttheworkpieceduringFSW.manufacturingenablingtechnology.ManyaspectsofUsingbothmarkermaterialandstopaction,FSWhavebeenstudiedquiteextensivelyinrecentyearsGUERAetal[5]identifiedaheavilydeformedzonewithandcomp

7、rehensivelyreviewedbyMISHRAandMA[1].sometraceofmarkermaterialaroundthepinandthusTheyconcludedthatmaterialflowduringFSWissuggestedacontinuousrotationzoneduringFSWofcomplicatedandnotwellunderstood.REYNOLDS[2],6061alloy.Furtherexperiments[8,10]confirmedinpresentingaspecialis

8、sueofScienceandTechnologyGUERAetal’sobservation.ItishowevernotcertainofWeldingandJoiningonFSW,co