Casting·Forging·Welding《》20103916082MIG1,1,2,1,1(1.,116028;2.,063035):、、6082MIG。:50876082,,84mm77.8%73%;,;6082MIG,,;,Mg2Si,。:6082;;;:TG444+.7;TG146.2+1:A:1001-3814(2010)01-0131-03MicrostructureandMechanicalPropertiesof6082AluminumAlloyJointsWeldedbyMIGXUHongji1,TANGHaiying1,LIUZhiping2,XIEMing1,JIAOJianqiang1(1.SchoolofMaterialScienceandEngineering,DalianJiaotongUniversity,Dalian116028,China;2.TangshanRailwayVehiclesCo.,Ltd.,Tangshan063035,China)Abstract:Microstructureandpropertiesof6082aluminumalloyweldjointwereinvestigatedbyroomtemperaturetensile,bending,hardnesstestandmetallographicanalysis.Theresultsshowthatthejointsof6082aluminumalloyweldedwithwire5087bymeansofMIGhasgoodtensilestrength.Thetensilestrengthofthejointwiththickness8mmand4mmare77.8%and73%respectively.ThebendingfailureconcentratesinHAZandbendangleissmall.Themicrostructureoftheweldedseamcenterisequiaxedgrainandtheweldedgrainiscolumnatecrystalsalongtheradiationdirection.Thefusionareacrystalgrainisthick.Thesoftenedareapresentesagingbehavior,causesMg2Sitogrowupandbecomestheweakestregion.Keywords:6082aluminumalloys;weldedjoint;microstructure;mechanicalproperties6082,、,。、、,、、、。,6082MIG,。16082-T6(48mm),:Rm=310MPa,A=10.5%。MIG,30%He+0.015%N2+69.985%Ar,准1.2mm5087。,4mm70°V,8mm90°V。1、2。、、。,。/A/V12130~15015019.2~21.221.29.39.31515-5+1/(m·min-1)/(L·min-1)/mm14mmTab.1Weldingparametersof4mmtestsample/A/V1234170~175173~190175~190175~19022.7~2322.9~23.423~23.423~23.410.911.912.212.218181818-6-3-1+2/(m·min-1)/(L·min-1)/mm28mmTab.2Weldingparametersof8mmtestsample:2009-09-03:(1959-),,,,,30;:15940986861;E-mail:xuhongji@djtu.edu.cn131DOI:10.14158/j.cnki.1001-3814.2010.01.007Casting·Forging·Welding20101HotWorkingTechnology2010,Vol.39,No.1GB/T2651-1989GB/T2653-1989WE-30。GB/T4342-1991FM700,100g。BX51M、JSM-6460LV、。22.160823。,8mm608278%,55.5%。4mm608273%,27.8%。3~5mm,。1,。2.26082MIG4。,,。2。,。2.336082。(a),,α(Al)Mg2Si,Mg2Si。,,/mmRm/MPaA(%)Z(%)1-11-21-38250.4244.7228.0241.056.26.25.816.330.417.721.53mm5mm3mm2-12-22-34215.6223.5239.5226.22.52.53.72.914.621.623.319.84mm4mm5mm36082Tab.3Thetensiletestresultsof6082weldingjointD=4a/mm/(°)1-11-21-31-4202-12-22-32-43060516363-3866814Tab.4Thebendtestresultsof6082weldingjoint1-116082Fig.1Tensilefracturesurfaceof6082weldingjoint26082Fig.2Bendingfracturesurfaceof6082weldingjoint30μm30μm30μm(a)(b)(c)36082Fig.3Microscopicstructureof6082weldingjoint2-3132Casting·Forging·Welding《》2010391(130)。4(1),、。(2)、、。:[1].[J].,1999,13(2):97-99.[2].[J].,2006,(3):49-50.[3].[J].,1993,(8):16-18.[4]LiuCunlong,LvYaohui,XuBinshi.Microstructureandtribo-logicalpropertiesoflayerdepositedbymicro-plasmaarcweld-ingonworngear[J].KeyEngineeringMaterials,2008,(373-374):338-341.[5],,.[J].,2003,(5):45-46.[6].[J].(),2005,26(6):76-77.[7].[J].,1999,(3):61-64.[8].[J].,1997,(4):8-10.[9],,,.[J].,2007,28(9):29-32,90.5Fig.5Weldmisalignmentinducedbymisalignmentofweldingtorch1mm(b),,(c)。,(c),,,,,,T6Mg2Siα(Al),。,,,,。2.446082。,78~100HV,,103HV。3mm,,66HV。,75HV。,,6082。3(1)6082MIG84mm,77.8%73%。(2)6082MIG。(3)6082MIG66~103HV,,HAZ。(4)6082MIG,,。,Mg2Si,。α(Al)Mg2Si,Mg2Si。:[1],.[M].:,1989.[2].[M].:,2005.[3],.[M].:,2006.[4],.[M].:,2000.[5],.[J].,2001,(2):37-39.[6],.6005A[J].,2001,(1):32-34,37.120100806040-4-20246810(HV)/mm46082Fig.4Hardnesscurveof6082weldingjoint133