冷金属过渡复合脉冲焊接（CMT＋P）窄间隙焊接头基体软化现象的有限元模拟.pdf

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1、Availableonlineatwww，sciencedirect．comTransactionsof镰ScienceDirectNonferrousMetalsSocietyofChinaTrans．NonferrousMet．Soc．China24(201411830—1835www．tnmsc．cnFEMmodelingofsoftenedbasemetalinnarrow-gapjointbyCMT+PMIXweldingprocedureFeng．yuanSHU，，Yao—huiLO。，Yu．xinLIU，Fu-jiaXU，，ZheSUN，PengH

2、E，Bin．shiXU，1．StateKeyLaboratoryofAdvancedWeldingandJoining，HarbinInstituteofTechnology，Harbin150001，China；2．ScienceandTechnologyonRemanufacturingLaboratory,AcademyofArmoredForcesEngineering，Beijing100072，ChinaReceived5June2013；accepted8September2013Abstract：Arequiredfiniteelementmet

3、hod(FEM)modelapplicablefornarrowgapCMTandCMT+PMIXweldingwasestablishedbasedontheinteractionsbetweenarc，basemetalandfillermeta1．Anovelmethodofsimplifyingwirefeedingpulsesandheatinputpulseswassupposedundertheconductionofequivalentinput．Themethodtogetherwithcomposeddouble—ellipseheatsou

4、rceswasincludedinthemode1．ThemodelwasemployedintheinvestigationofthermalcyclingandtheidentificationofthesoftenedzoneofAA7A52baseplates．Low—frequencybehavioremergedintheformoflow．coolingratesects．whichwerenotexpectedunderexperimentalconditions．Thesoftenedzoneincludingthequenchedzonean

5、daveragingzoneofthebaseplatewasmuchwiderinternalthebaseplatethanthatclosetothesurfaces．Thereliabilityofthepredictionsinthermalcyclingwassupposedbyinfraredimagingtestresultsofthethermalcycleprocess．Keywords：coldmetaltransferring；finiteelementmethod；equivalentinput；1ow—coolingratesects

6、；softenedzonereportedsystematicinvestigationonarcandweldpool1Intr0ductiOnduringGWprocess．TheshapeandenergydistributionwerepredictedundertheconductionthatthedynamicThenumericalsimulationbaseduponfiniteelementbehavioroftheweldpoolcouldbepredicted．However．method(FEM)hasbeenaneffectivewa

7、yoftheinteractionbetweenarc．basemetalandfillermetalinvestigatingtheinstantaneouscharacteristicsduringbecomesmuchmorecomplexduetotheuniqueshapematerialsprocessing．FewreportshavebeenfoundonandenergydistributionofarcwhenCMT+PMIXisusedsimulationaboutcoldmetaltransferring(CMT)orCMTinnarow

8、gapweldingof