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1、上海交通大学硕士学位论文基于DSP控制的铝合金脉冲焊接电源及电弧形态研究姓名：陆志强申请学位级别：硕士专业：材料加工工程指导教师：华学明20090101摘要弧燃烧的参数，峰值时间对电弧弧长没有影响，却显著影响电弧面积。随着电源输出波形控制技术日益成熟，本研究通过调节脉冲上升和下降斜率，改变电流的输出波形，从而研究了脉冲波形的变化对电弧形态和电弧挺度的影响。脉冲斜率变化导致脉冲时间过程中脉冲能量的变化，脉冲能量的变化影响着电弧形态的变化。同时通过调节脉冲上升和下降斜率，实现脉冲焊接电弧挺度硬软规范的调节。采用软规范焊接时电弧燃烧面积大，熔深熔宽较大，而
2、硬规范焊接电弧比较集中，但是熔深熔宽较小。关键词：铝合金脉冲参数电流波形电弧IIAbstractStudyonAluminumAlloyP-MIGWeldingPowerandArcShapeBasedOnDSPControlABSTRACTPulse-MIGweldingwithlowheatinput,highproductivity,easyautomationfeaturesismoresuitableforaluminumwelding.PulsedMIGweldingofaluminumalloynotonlyexpandsthescop
3、eoftheweldingcurrent,butalsoimprovesthestabilityofarc,andcanadapttoavarietyofweldingoccasions.Inrecentyears,thealuminumP-MIGweldingtechnologyhasbeenwidelyusedinthemanufactureprocess.However,duetothespecialpropertiesofaluminum,therearestillsomeproblemsinweldingapplications.Pulse
4、weldingtechnologyiscomplicatedandcontroltechnologyisalsomorecomplicated.Howtocontrolthevarioustypesofsignalseffectivelyandhowtogetasuitablecurrentpulsewavehavebecomeveryimportant.Inthispaper,wedesignedthealuminumalloyP-MIGdigitalcontrolsystembasedonDSPcontroltechnology.Bythesys
5、tem,wecanachievethegoodpulsecurrentwaveformandthestableweldingprocess.Whatismore,basecurrent,peakcurrent,peaktimeparameterscanbemanuallyadjusted.Forthepulsecurrentwavecontrol,weachieveregulatepulserisingslopeandfallingslopeindependently.Thecharacteristicsofweldingarchaveanimpor
6、tantimpactonthechemicalproperties，themicrostructure,geometryandgravityorganizations.Astherearemanyparametersinpulseweldingprocessandtheseparametershavedifferentinfluenceontheweldingarc,howtochoosethesuitableparametersisveryimportant.Amongthevariouspulseparameters,thepeakcurrent
7、,basecurrentandpeaktimeparametersaretheextremelyimportantparameters.WehavedosomeexperimentaboutP-MIGweldingofaluminum-magnesiumalloytoanalyzetheinfluencesofAluminumP-MIGweldingparametersontheIAbstractweldingarc.Byregulatingthedifferentpulseparameters,wedotheresearchabouttheinfl
8、uencesofthepeakcurrentandbasecurrentonthearc.Underthec
