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ElectricWeldingMachineElectricWeldingMachineElectricWeldingMachineElectricWeldingMachineElectricWeldingMachineElectricWeldingMachineElectricWeldingMachineElectricWeldingMachineElectricWeldingMachineElectricWeldingMachineElectricWeldingMachineElectricWeldingMachineElectricWeldingMachineElectricWeldingMachineElectricWeldingMachineElectricWeldingMachineElectricWeldingMachineElectricWeldingMachineElectricWeldingMachineElectricWeldingMachineElectricWeldingMachineElectricWeldingMachineElectricWeldingMachineElectricWeldingMachine铝合金因其本身特性导致焊接过程中容易产生裂纹、气孔、未熔合等焊接缺陷，对焊接接头性能产生较大影响。焊接作为轨道车辆中普遍采用的连接方法，焊接接头是铝合金结构中比较薄弱的部位，也是结构失效的主要部位。因此保证焊接质量是保证轨道车辆安全运行的关键措施之一。目前高速列车铝合金焊接方法主要采用MIG焊，结合生产实际，分析铝合金MIG焊常见焊接缺陷的产生原因和危害，并提出了预防措施和处理方法。铝合金；MIG焊；焊接缺陷；原因分析；预防措施TG444＋.74B1001－2303(2013)04－0072-05DOI10.7512/j.issn.1001-2303.2013.04.1643420134Vol．43No．4Apr．2013ElectricWeldingMachine：2012－08－01：2012－10－22：5212302-X022：—。(唐山轨道客车有限责任公司，河北唐山063035)ReasonanalysisandprecautionarymeasureonMIGwelddefectofAluminiumalloyLIHuiGUOJi-xiangHEXiao-boHOUZhen-guoCHUHong-yuTangshanRailwayVehicleCo.Ltd.Tangshan063053ChinaAbstract：Itiseasilytocausewelddefectsinthealuminiumalloyweldingprocessbecauseofitsnature.Thewelddefectsincludingporescracks,fusiondefectsetc..Welddefectwillaffectqualityofproducts.Whileweldingasonegeneralconnectionmethodintherailwayvehicleproductiontheweldjointistheweakandeasytodestroyedpartinaluminiumalloystructure.Soassurancetheweldjointqualityisoneofkeymeasuretoensurethesafetyofrailwayvehicleworking.MIGweldingisthemainweldmethodinrailwayvehicleproductionbynow.Itwillbeintroducedaboutreasonanalysisdamagepreventionmeasureandsolvingmeasuresofthewelddefectsinthistestaccordingtheproductionprocess.Keywords：aluminiumalloyMIGweldingwelddefectreasonanalysisprecautionarymeasure0、、。[1]。、[2]MIG。MIG。1、MIG、、、、、、、、、1。MIG72··ElectricWeldingMachineElectricWeldingMachineElectricWeldingMachineElectricWeldingMachineElectricWeldingMachineElectricWeldingMachineElectricWeldingMachineElectricWeldingMachineElectricWeldingMachineElectricWeldingMachineElectricWeldingMachineElectricWeldingMachineElectricWeldingMachineElectricWeldingMachineElectricWeldingMachineElectricWeldingMachineElectricWeldingMachineElectricWeldingMachineElectricWeldingMachineElectricWeldingMachineElectricWeldingMachineElectricWeldingMachineElectricWeldingMachineElectricWeldingMachine1.1。、。。。、、、、、、、、、8mm。、、。、、、[3]。。1MIGabcdefghijMIG473··ElectricWeldingMachineElectricWeldingMachineElectricWeldingMachineElectricWeldingMachineElectricWeldingMachineElectricWeldingMachineElectricWeldingMachineElectricWeldingMachineElectricWeldingMachineElectricWeldingMachineElectricWeldingMachineElectricWeldingMachineElectricWeldingMachineElectricWeldingMachineElectricWeldingMachineElectricWeldingMachineElectricWeldingMachineElectricWeldingMachineElectricWeldingMachineElectricWeldingMachineElectricWeldingMachineElectricWeldingMachineElectricWeldingMachineElectricWeldingMachine1.2。。20MIG、TIG、、、、、、、、。、[4]。5%-。、、、、、、1m/s。1.3。、、、、。、、。1.4。、、V、。。、、。1.5。4374··ElectricWeldingMachineElectricWeldingMachineElectricWeldingMachineElectricWeldingMachineElectricWeldingMachineElectricWeldingMachineElectricWeldingMachineElectricWeldingMachineElectricWeldingMachineElectricWeldingMachineElectricWeldingMachineElectricWeldingMachineElectricWeldingMachineElectricWeldingMachineElectricWeldingMachineElectricWeldingMachineElectricWeldingMachineElectricWeldingMachineElectricWeldingMachineElectricWeldingMachineElectricWeldingMachineElectricWeldingMachineElectricWeldingMachineElectricWeldingMachine[5]。、Y。。Y、。1.6。Y。。、。1.7。、。。、、。1.8。。。、。1.9、、。。。、、、、、、。、。、。1.10。。、、、、。MIG475··ElectricWeldingMachineElectricWeldingMachineElectricWeldingMachineElectricWeldingMachineElectricWeldingMachineElectricWeldingMachineElectricWeldingMachineElectricWeldingMachineElectricWeldingMachineElectricWeldingMachineElectricWeldingMachineElectricWeldingMachineElectricWeldingMachineElectricWeldingMachineElectricWeldingMachineElectricWeldingMachineElectricWeldingMachineElectricWeldingMachineElectricWeldingMachineElectricWeldingMachineElectricWeldingMachineElectricWeldingMachineElectricWeldingMachineElectricWeldingMachine。、、。、、、、、、、2。。。[6]。2ISO10042、、、、、、、、、、、、、。31MIG、、、、、。2MIG、、、。3、、。：[1].[D].2007.[2].[J].20114111103-105.[3].[M].2004122-123.[4].[J].201038(1)53-55.[5].[M].19956-7.[6].[J].2010(16)22.2abcdefgh4376··