简介：Thearcsprayingprocessisdividedintotwostages:thefirststageisatomization-sprayingstream(ASS)andthesecondoneissprayingdeposition(SD).Thenstudystatusisdescribedofbothstages'physicalmodelandcorrespondingcontrolling-equation.Basedontheanalysisofstudystatus,theconclusionasfollowsisgot.TheheatandmasstransfermodelswithtwoorthreedimensionsinASSstageshouldbeestablishedtofardeeplyanalysesthedynamicalandthermalbehavioroftheoverheatdroplet.Thestatisticslawofoverheateddropletsshouldbefurtherstudiedbyconnectingsimulationwithexperiments.MorepropervalidationexperimentsshouldbedesignedforflatteningsimulationtomodifythemodelsinSDstage.

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简介：Theinfraredcameraisusedtoinvestigatethetemperaturefieldofgasmetalarcwelding.Theresultsshowthatthetemperaturedistributionofweldpoolandadjacentareaappearsconeshape.AnewheatsourcemodelcombinedbyGaussiandistributionheatsourceofthearcandconicaldistributionheatsourceofthedropletissetupbasedontheexperimentalresults,andwiththecombinedboundaryconditions,thetemperaturefieldofgasmetalarcweldingissimulatedusingfiniteelementmethod.AccordingtothecomparisonbetweentheresultsofexperimentandsimulationintemperaturefieldshowsthatthenewcombinedheatsourcemodelismoreaccurateandeffectivethantheGaussheatsourcemodel.

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简介：Dendriticgraingrowthattheedgeoftheweldpoolissimulatedusingastochasticnumericalmodelofcellularautomatonalgorithm.Thegraingrowthmodelisestablishedbaseduponthebalanceofsoluteinthesolid/liquidinterfaceofthedendritetip.Consideringthecomplicatednucleationconditionandcompetitivegrowth,thedendritemorphologiesofdifferentnucleationconditionaresimulated.Thesimulatedresultsreproducedthedendritegrainevolutionprocessattheedgeoftheweldpool.Itisindicatedthatthenucleationconditionisanimportantfactorinfluencingthegrainmorphologiesespeciallythemorphologiesofsecondaryandtertiaryarms.

简介：Inthispaper,anumericalinvestigationaboutthemetaltransferofGMAWisinvestigatedbasedonthephasefieldmodel.Bedifferentofmostpublishedwork,wetakethethermocapillaryeffectandmixtureenergyintotheprocessofphasetransferandinterfacechangewhichisdifferentfromvolumeoffluid(VOF)method.Wediscretizethewholemodelwithacontinuousfiniteelementmethodandwealsoapplyapenaltyformulationtothecontinuityconditionenhancingthestabilityofthepressure.MetaltransferofGMAWwithconstantandpulsecurrentiscomputedasnumericalexampleswhichagreeswellwiththedataofhigh-speedphotography.Theresultshowsthatthecomputingprocessofthephasefieldmodelisstabilityandithasahigherprecisioninpredictingthediameterofdroplet.

简介：Amodelwasdevelopedtosimulatethetemperaturedistributionandnuggetformationduringresistancespotwelding(RSW)ofzinc-coatedsteels.Itemploysacoupledthermal-electrical-mechanicalanalysissimulatingthedynamicRSWprocess.Temperature-dependentthermal-electrical-mechanicalmaterialpropertieswereconsideredincludingcontact-resistance.Thecontactareawasdeterminedfromacoupledthermal-mechanicalanalysis.Alayeroftransitionelementswasusedtorepresentthechangeofcontactareabykillingoractivatingelements.Theheatgenerationandtemperaturefieldwerecomputedinacoupledthermal-electricalmodel.Alltheseanalysesweresolvedusingthecommercialfiniteelementmethod(FEM)basedonANSYScode,andsomeadvancedfunctionswereusedbywritingaparagraphofcodesbytheauthors.Comparedwiththeresultsfromonlycoupledthermal-electricalmodelinwhichcontactareawasuniformduringthewholeprocess,theresultmatchesbettertotheexperimentalresults.

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简介：Threekindsofmathematicalmodelsrepresentingweldingheatsourcesarepresented.Amongthem,Gaussianmodelanddoubleellipsoidalmodelareusedtoanalyzethethermaldistributionswithfiniteelementmethod.Atthesametime,thispaperanalyzedtheinfluencesoftheheatsourcemodels,thelatentheatandtheweldingparametersonthetemperaturedistributions.Thecomparisonsbetweenthesimulatedresultsandtheexperimentsshowdoubleellipsoidalmodelisgoodforthree-dimensionalnumericalsimulations.Furthermore,theadaptivemeshtechniqueisappliedinthethree-dimensionalmodelwhichgreatlyreducesthenumberofnodesandelementsinthesimulation.

简介：Compositesarewidelyappliedtothemanufacturingofaircraftinaviation.Formingoflarge-scalecompositecomponentinaircraftrequiresthecorrespondingmoldwithprecisesize.Thelaser-MIGhybridweldinghasasignificantadvantageinthemanufacturingofInvarmoldforaircraftcomposites.Thispapermainlyintroducestheapplicationofthelaser-MIGhybridwelding,andthedistributionofthermalfieldandflowfieldontheInvaralloylaser-MIGhybridthree-layerweldingisanalyzedanddiscussedspecifically.

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简介：SYSWELDwasusedtosimulatein-serviceweldingprocessofgaspipelineofX70pipelinesteel.Weldingthermalcycle,stressanddeformationofin-serviceweldedjointwerestudied.Theresultsshowthatpeaktemperatureofcoarsegrainheat-affectedzone(CGHAZ)ofin-serviceweldingontogaspipelineisthesamewithroutinewelding,butt_(8/5),t_(8/5)andt_(8/1)decreaseatcertaindegree.Forthezonenearweldedseam,axialstressandhoopstressintheinnerpipewallarecompressivestresswhenweldingsourcepassesthroughthecross-sectionthatisstudied,butresidualaxialstressandresidualhoopstressafterweldedarealltensilestress.Transientdeformationandresidualdeformationareallconvexdeformationcomparedwiththeoriginalpipediametersize.Deformationachievesmaximumwhenweldingthermalsourcepassesthroughthecross-sectionthatisstudiedandthendecreasesduringthecoolingprocessafterwelding.

简介：Therestraintintensity(RI)ofthepipelinegirthweldingjointwasinvestigatedusingfiniteelementmethodandexperimentalmethodtopredictthecoldcrackingsusceptibilityofpipelinesteel.ThedistributionofRIalongthegirthweldwasinvestigatedtostudytheinfluenceofweldingpositionontheRI.Subsequently,theeffectsofouterdiameter(OD)andwallthicknessofpipelineontheRIwerestudiedwithABAQUSsoftware.TheresultsshowthattheRIisalmostindependentofweldingposition.TheRIincreasedwiththeincreasingwallthicknessbutdecreasedwiththeincreasingOD.ApredictionmodelofRIwasdevelopedbasedontheeffectsoftheODandthewallthickness.IthasbeenfoundthatthepredictedRIswereingoodagreementwiththeexperimentalvalues.ThemaximumfractionalerrorbetweenthepredictedRIandtheexperimentalvalueswasjustabout10%.Itwasindicatedthattheerrorsweremainlycausedbytheheterogeneousoftheweldbead.

简介：Anobject-orientedmulti-roboticgraphicsimulationenvironmentisdescribedinthispaper.Object-orientedprogrammingisusedtomodelthephysicalobjectsoftheroboticworkcellintheformofsoftwareobjectsorclasses.Thevirtualobjectsaredefinedtoprovidetheuserwithauser-friendlyinterfaceincludingrealisticgraphicsimulationandclarifythesoftwarearchitecture.Theprogrammingmethodofassociatingthetaskobjectwithactiveobjecteffectivelyincreasesthesoftwarereusability,maintainabilityandmodifiability.Tasklevelprogrammingisalsodemonstratedthroughamulti-robotweldingtaskthatallowstheusertoconcentrateonthemostimportantaspectsofthetasks.Themulti-threadprogrammingtechniqueisusedtosimulatetheinteractionofmultipletasks.Finally,avirtualtestiscarriedoutinthegraphicsimulationenvironmenttoobservedesignandprogramerrorsandfixthembeforedownloadingthesoftwaretotherealworkcell.

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