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1、大連交通大學(xué)2011屆本科生畢業(yè)設(shè)計（論文）外文翻譯WeldingSimulationofCastAluminiumA356X-T.Pham*,P.GougeonandF-O.GagnonAluminiumTechnologyCentre,NationalResearchCouncilCanadaChicoutimi,Quebec,CanadaAbstractWeldingofcastaluminiumhollowpartsisanewpromisingtechnicaltrendforstructur
2、alassemblies.However,biggapbetweencomponents,weldporosity,largedistortionandriskforhotcrackingneedtobedealtwith.Inthispaper,theMIGweldingofaluminiumA356castsquaretubesisstudied.Thedistortionoftheweldedtubeswaspredictedbynumericalsimulations.Agoodagreemen
3、tbetweenexperimentalandnumericalresultswasobtained.IntroductionAluminiumstructuresbecomemoreandmorepopularinindustriesthankstotheirlightweights,especiallyintheautomotivemanufacturingindustry.Moreover,weldingofcastaluminiumhollowpartsisanewpromisingtechni
4、caltrendforstructuralassemblies[1-3].However,itmaybeverychallengingduetomanyproblemssuchasbiggapbetweencomponents,weldporosity,largedistortionandriskforhotcracking[4,5].Duetolocalheating,complexthermalstressesoccurduringwelding;residualstressanddistortio
5、nresultafterwelding.Inthispaper,thealuminiumA356casttubeMIGweldingisstudied.ThesoftwareSysweld[6]wasusedforweldingsimulations.Theobjectiveistovalidatethecapabilityofthissoftwareinpredictingthedistortionoftheweldedtubesinthepresenceoflargegaps.Inthiswork,
6、theporosityofweldswascheckedafterweldingusingtheX-raytechnique.Theheatsourceparameterswereidentifiedbasedontheweldcross-sectionsandweldingparameters.Full3Dthermalmetallurgicalmechanicalsimulationswereperformed.Thedistortionspredictedbythenumericalsimulat
7、ionswerecomparedtoexperimentalresultsmeasuredafterweldingbyaCMMmachine.ExperimentsExperimentalsetupTwosquaretubesaremadeofA356bysandcastingandthenmachined.TheyareassembledbyfourMIGwelds,namedW1toW4.TheirdimensionsandtheweldingconfigurationaredepictedinFi
8、gure1.Bothsmall(inner)andlarge(outer)tubesarewellpositionedonafixtureusingv-blocksasshowninFigure2.Thedimensionsofthetubesmakeaperipheralgapof1mmbetweenthem.Thisfixtureisfixedonapositionerthatallowstheweldingprocesstobecar
