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1、學(xué)兔兔www.xuetutu.com第51卷第4期機(jī)械工程學(xué)報(bào)v01．51NO．42015年2月JOURNALOFMECHANICALENGINEERINGFeb．2015DoI：10．3901，JME．2015．04．084單電源三絲MIG焊的交替燃弧特性水向婷李桓楊立軍韋輝亮高瑩2(1．天津大學(xué)天津市現(xiàn)代連接技術(shù)重點(diǎn)實(shí)驗(yàn)室天津300072；2．天津職業(yè)技術(shù)師范大學(xué)天津市高速切削與精密加工重點(diǎn)實(shí)驗(yàn)室天津300222)摘要：三絲焊作為一種高效的焊接方法受到重視，而電弧形態(tài)及燃弧特性是反映焊接過程穩(wěn)定性，決定焊縫成形及質(zhì)量的重要因素。試驗(yàn)中搭建三絲熔化極惰性氣體保護(hù)(Metaliner
2、t-gas，MIG)焊系統(tǒng)，利用MultDaq電信號(hào)采集系統(tǒng)采集焊接電流和電弧電壓波形，借助高速攝像系統(tǒng)同步拍攝電弧形態(tài)及熔滴過渡過程，實(shí)時(shí)監(jiān)測(cè)焊接過程。觀察不同電弧電壓下的焊絲燃弧情況及熔滴過渡方式，研究短路過渡和大滴過渡形式下的交替燃弧機(jī)理，以及電弧電壓對(duì)單電源三絲MIG焊交替燃弧過程的影響。結(jié)果表明，當(dāng)焊接電源供給能量較小時(shí)，并聯(lián)的三根焊絲上的電流分配呈現(xiàn)“此消彼長(zhǎng)”的規(guī)律而導(dǎo)致電弧在焊絲間交替燃燒，且焊絲在電弧空間中的位置決定了焊絲上的電流分配。隨著電弧電壓的增加，交替燃弧頻率減小。當(dāng)電弧電壓達(dá)到34V時(shí)，三根焊絲同時(shí)燃弧，無交替燃弧現(xiàn)象，交替燃弧頻率變?yōu)?Hz關(guān)鍵詞：三絲M
3、IG焊；交替燃弧；短路過渡；大滴過渡中圖分類號(hào)：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
