Analysis of magnetohydrodynamics GTAW arc behavior

《Analysis of magnetohydrodynamics GTAW arc behavior》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、FrédéricRogerAnalysisofmagnetohydrodynamicsGTAWarcbehaviorAbstractArgonplasmabehavioringastungsten2Mathematicalmodelarcwelding(GTAW)isdirectlylinkedtotheweldquality.Indeed,thearcistheheatsourcewhichThemodeldescribesthefluidflowandthedrivestheweldshape.Solutionofaninduction-electromagneticfie

2、ldinthespacebetweenthediffusionequationunderaxialsymmetryconditionstungstencathodeandtheanodeworkpiece.WehasbeendeveloppedusingthermalconductionandconsideranaxialsymmetrictwodimensionalconvectionmoduleofFemlab3.1©.Wepredictdescription.currentdistributioninelectricarc,inducedmagneticfieldandt

3、henresultingelectromagneticforces.The2DaxialsymmetricstationaryNavierStokesThelatterisintroducedinincompressibleaxialincompressibleequationsareusedinFemlab3.1fluidsymmetricNavier-Stokesequations.BothPdesaredynamicsmodule.Fortheconvectioninductionstronglycoupled.Indeed,Plasmavelocityfieldequa

4、tion,weusetheconductiveandconvectiveintroducesasourcetermintheinductiondiffusionstationaryheattransfermodel.TemperatureTisthenequation.replacedbytheazimuthalmagneticfieldBBθ.KeywordsArcwelding–magnetohydrodynamics-plasma2.1Governingsequations1IntroductionWeconsiderthemagneticfieldBastheprinc

5、ipalelectromagneticquantity.AlltheotherquantitiesThefirstworkaboutelectromagneticarcplasma(E,J,q)canbededucedusingMaxwell’sequationsbehaviorisfiftyyearsold[1]withtheMaecker’sandOhm’sLaw.FromOhm’slaw,AmpereanddescriptionoftheconvectionintheplasmawhichisFaraday’sequationswecandeducethestationa

6、ryassumedtobeinlocalthermodynamicequilibriuminductionconvectionequation:(LTE)withthesamelocaltemperatureforionsandelectrons.1curl()uB∧+Δ=B0(1)Convection,withhighplasmavelocity(aboutμσ100m/s),drivesheattransferwiththeweldpooland-1withutheplasmavelocity(m.s),μthethentheshapeandthethermomechani

7、csbehaviorof-1permeabilityofmatter(orvacuum,H.m)andσthetheweld.-1-1electricalconductivity(Ω.m).FemlaballowstoconsiderthewholesetofnonInthe2Daxialsymmetricconfiguration,equationlinearphysicsequations(nonlinearcouplingPDE’s)(1)becomes:todescribetheve