单电源三丝mig焊交替燃弧特性

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1、学兔兔www.xuetutu.com第51卷第4期机械工程学报v01．51NO．42015年2月JOURNALOFMECHANICALENGINEERINGFeb．2015DoI：10．3901，JME．2015．04．084单电源三丝MIG焊的交替燃弧特性水向婷李桓杨立军韦辉亮高莹2(1．天津大学天津市现代连接技术重点实验室天津300072；2．天津职业技术师范大学天津市高速切削与精密加工重点实验室天津300222)摘要：三丝焊作为一种高效的焊接方法受到重视，而电弧形态及燃弧特性是反映焊接过程稳定性，决定焊缝成形及质量的重要因素。试验中搭建三丝熔化极惰性气体保护(Metaliner

2、t-gas，MIG)焊系统，利用MultDaq电信号采集系统采集焊接电流和电弧电压波形，借助高速摄像系统同步拍摄电弧形态及熔滴过渡过程，实时监测焊接过程。观察不同电弧电压下的焊丝燃弧情况及熔滴过渡方式，研究短路过渡和大滴过渡形式下的交替燃弧机理，以及电弧电压对单电源三丝MIG焊交替燃弧过程的影响。结果表明，当焊接电源供给能量较小时，并联的三根焊丝上的电流分配呈现“此消彼长”的规律而导致电弧在焊丝间交替燃烧，且焊丝在电弧空间中的位置决定了焊丝上的电流分配。随着电弧电压的增加，交替燃弧频率减小。当电弧电压达到34V时，三根焊丝同时燃弧，无交替燃弧现象，交替燃弧频率变为0Hz关键词：三丝M

3、IG焊；交替燃弧；短路过渡；大滴过渡中图分类号：TG403AlternateArcingCharacteristicsoftheTriple—wireMIGWeldingXIANGTingLIHuanYANGLijunWEIHuiliangGAOYing(1．TianjinKeyLaboratoryofAdvancedJoiningTechnology,TianjinUniversity,Tianjin300072；2．TianjinKeyLaboratoryofHighSpeedCuttingandPrecisionMachining，TianjinUniversityofTech

4、nologyandEducation，Tianjin300222)Abstract：Asakindofeficientweldingmethod．triple—wireweldingistakenseriously,andthearcshapeandarcingcharacteristicsareimportantfactorsinreflectingthestabilityofweldingprocessanddeterminingtheweldqualityandformation．Triple—wiremetalinert-gas(MIG)weldingsystemhasbee

5、nestablishedinthetest．Intheweldingprocess，thewaveformsofweldingcurrentandarcvoltageareacquiredthroughtheMultDaqsignalacquisitionsystemwhilethearcbehaviorandmetaltransferprocessaremonitoredbyhigh-speedphotographysystemsynchronously．ThenthewholeweldingprocessCanbemonitoredinrealtime，themechanismo

6、falternatearcingindiferentmetaltransfermodesandtheinfluenceofarcvoltageonalternatefrequencyarestudied．TheresultsofexperimentsshowthatwhentheweldingpowersourceCallonlysupplylessenergy,thecurrentdistributiononthreewiresconnectedinparallelpresentstheruleof‘‘shift”，whichresultsinalternatearcingamon

7、gwires．Moreover,currentdistributiononthreewiresisdecidedbythelocationofwiresinthearcspace．AstheincreasesofthearCvoltage，thealternatefrequencydecreases．Whenthearcvoltageisupto34thethreewiresstartarcingsimultaneously,noalternatearci