汽车用镁合金薄板点焊新工艺及设备分析

ElectricWeldingMachine。。210。。TG457．19A1001－2303(2010)05－0055－0540520105Vol．40No．5May．2010ElectricWeldingMachine121111(1．4710032．471003)AnalysisofresistancespotweldingtechnologyandequipmentformagnesiumalloythinplateinautomotiveindustriesSHIHong-xin12QIURan-feng1YUHua1WANGYao-li1DINGGao-jian1(1．SchoolofMaterialsScienceandEngineering，He'nanUniversityofScienceandTechnology，Luoyang471003，China；2．KeyLaboratoryofScienceandProcessingTechnologyofNon-ferrousMetals，He'nanUniversityofScienceandTechnology，Luoyang471003，China)Abstract：Magnesiumalloywithexcellentcharacteristicsbecomesthefocusintheautomotiveindustriesmeanwhileresistancespotwelding(RSW)isawidelyusedandimportantweldingprocessintheweldofautomotivemanufacturing．Thusresistancespotweldingtechnologyandequipmentformagnesiumalloythinplatewereanalyzedinthispaper．Theweldingwaysofmagnesiumalloyincludeconventionalresistancespotweldingandnewonewithcoverplates．Fortheformertheweldingcurrentformagnesiumalloywasabouttwiceasmuchasthecurrentformildsteeltheweldingtimewasshorterpre-pressuretimewasgeneral10cycles．Forthelattertheweldingcurrentformagnesiumalloywasalmostthesameasthecurrentformildsteeltheelectrodepressurewassmalleraddingdown－slopingtimecouldeffectivelylessenporefrictioninthejoint．TheperformanceofDC－RSWisbetterthantheoneofAC－RSWtheinverterDC－RSWmachinewithmicrocomputercontrolsystemisbetterfitformagnesiumalloywelding．Keywords：magnesiumalloy；resistancespotwelding；coverplate；inverterDC－RSWmachine：2010－03－18：(2006QN069)：(1973—)。0。10％6％～8％。、。[1－3]。1。︱︱55··ElectricWeldingMachine、。。0．1×10－3(5min)[4]。、。2。、。1、。。12．1。Sun1．2mm＋1．2mm2。215000A23000A1460N3000N[5]。20000A2000N。3(1mm＋1mm)[6]。317000A1980N。(1mm＋1mm)18000A1825N[7]。31mm＋1mm8800A1．2mm＋1．2mm9800A[8]。2。。4。44000A11000A。11000A5000N。(1mm)240︱︱56··ElectricWeldingMachine。2．2。[8]。。5。5、[6]。102000N。、。56。5。144500N10“”。62．3。。7。[6]。2475N5．6mm1980N。。。78[6]。45︱︱57··ElectricWeldingMachine。10～14。89。(1)(2)。2121N“”。9310a10b[3]。()。。()。ab10。11。1115。15。114。[9]80C196KCDSPBP[10－13]。。。40︱︱58··ElectricWeldingMachine。[14－15]。。。5(1)。(2)1mm＋1mm17000～18000A2457N(10)10。。(3)1mm＋1mm11000A2121N10。15。(4)。[1]．Mg[J]．200137(7)673－684．[2]．[J]．200515(2)165－178．[3]QiuRFSatonakaSIwamotoC．MechanicalpropertiesandmicrostructuresofmagnesiumalloyAZ31Bjointfabricatedbyresistancespotweldingwithcoverplates[J]．ScienceandTechnologyofWeldingandJoining200914(8)691－697．[4]．[J]．200425(6)27－30．[5]SunDQLangBSunDXetal．Microstructuresandmechanicalpropertiesofresistancespotweldedmagnesiumalloyjoints[J]．MaterialsScienceandEngineeringA2007460－461494－498．[6]．AZ31B[J]．200440(5)131－135．[7]．AZ31B[J]．2005(9)12－15．[8]．[M]．2008．[9]．[J]．200737(5)39－41．[10]．[J]．200527(6)633－636．[11]．DSP[J]．200636(6)41－44．[12]．DSP[J]．200837(1)48－50．[13]．BP[J]．200737(9)48－51．[14]．[J]．200535(2)45－46．[15]．[J]．200425(6)11－14．5︱︱59··