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1、大連交通大學2011屆本科生畢業(yè)設計（論文）外文翻譯WeldingSimulationofCastAluminiumA356X-T.Pham*,P.GougeonandF-O.GagnonAluminiumTechnologyCentre,NationalResearchCouncilCanadaChicoutimi,Quebec,CanadaAbstractWeldingofcastaluminiumhollowpartsisanewpromisingtechnicaltrendforstructuralassemblies.However,biggapbetweencompon
2、ents,weldporosity,largedistortionandriskforhotcrackingneedtobedealtwith.Inthispaper,theMIGweldingofaluminiumA356castsquaretubesisstudied.Thedistortionoftheweldedtubeswaspredictedbynumericalsimulations.Agoodagreementbetweenexperimentalandnumericalresultswasobtained.IntroductionAluminiumstructur
3、esbecomemoreandmorepopularinindustriesthankstotheirlightweights,especiallyintheautomotivemanufacturingindustry.Moreover,weldingofcastaluminiumhollowpartsisanewpromisingtechnicaltrendforstructuralassemblies[1-3].However,itmaybeverychallengingduetomanyproblemssuchasbiggapbetweencomponents,weldpo
4、rosity,largedistortionandriskforhotcracking[4,5].Duetolocalheating,complexthermalstressesoccurduringwelding;residualstressanddistortionresultafterwelding.Inthispaper,thealuminiumA356casttubeMIGweldingisstudied.ThesoftwareSysweld[6]wasusedforweldingsimulations.Theobjectiveistovalidatethecapabil
5、ityofthissoftwareinpredictingthedistortionoftheweldedtubesinthepresenceoflargegaps.Inthiswork,theporosityofweldswascheckedafterweldingusingtheX-raytechnique.Theheatsourceparameterswereidentifiedbasedontheweldcross-sectionsandweldingparameters.Full3Dthermalmetallurgicalmechanicalsimulationswere
6、performed.ThedistortionspredictedbythenumericalsimulationswerecomparedtoexperimentalresultsmeasuredafterweldingbyaCMMmachine.ExperimentsExperimentalsetupTwosquaretubesaremadeofA356bysandcastingandthenmachined.TheyareassembledbyfourMIGwelds,namedW1toW4.Theirdimensionsandtheweldingconfigurationa
7、redepictedinFigure1.Bothsmall(inner)andlarge(outer)tubesarewellpositionedonafixtureusingv-blocksasshowninFigure2.Thedimensionsofthetubesmakeaperipheralgapof1mmbetweenthem.Thisfixtureisfixedonapositionerthatallowstheweldingprocesstobecar
