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《CO_2激光_MAG電弧復(fù)合焊接_省略_數(shù)對熔滴過渡特征和焊縫形貌的影響_劉雙宇》由會員上傳分享，免費在線閱讀，更多相關(guān)內(nèi)容在行業(yè)資料-天天文庫。
1、第37卷第12期中國激光Vol.37,No.122010年12月CHINESEJOURNALOFLASERSDecember,2010文章編號:0258-7025(2010)12-3172-08CO2激光-MAG電弧復(fù)合焊接工藝參數(shù)對熔滴過渡特征和焊縫形貌的影響*劉雙宇張宏石巖劉鳳德劉佳徐春鷹(長春理工大學(xué)機電工程學(xué)院,吉林長春130022)摘要以7.0mm厚高強鋼板為試驗材料,采用CO2激光-熔化極活性氣體保護焊(MAG)電弧復(fù)合焊接方法,研究了電弧能量、激光能量、光絲間距等參數(shù)對復(fù)合焊接熔滴過渡特征、工藝穩(wěn)定
2、性和焊縫形貌的影響。結(jié)果表明,CO2激光-MAG電弧復(fù)合焊接過程中,激光的加入,降低了激光匙孔附近等離子體通道的電阻,使電弧被吸引并壓縮至激光匙孔處,從而使電弧陰極斑點更加穩(wěn)定。電弧能量決定熔滴過渡的模式,激光能量主要影響熔滴的過渡頻率。當(dāng)電弧能量小于4kW時,熔滴過渡模式為短路過渡和顆粒過渡或是二者的混合過渡;當(dāng)電弧能量大于4.68kW時,熔滴的過渡模式為射滴過渡。熔滴的過渡模式對獲得穩(wěn)定的可重復(fù)焊接工藝至關(guān)重要,射滴過渡比短路過渡更有利于焊接過程的穩(wěn)定。熱源間距保持在2~4mm的范圍內(nèi),避免熔滴干擾激光匙孔和
3、熔池產(chǎn)生紊流。關(guān)鍵詞激光技術(shù);CO2激光-MAG電弧復(fù)合焊接;射滴過渡;等離子體形貌;焊縫形狀;熔滴過渡中圖分類號TG456.7文獻標(biāo)識碼Adoi:10.3788/CJL20103712.3172EffectsofProcessParametersonDropletTransferandBeadShapeinCO2-MAGHybridWeldingLiuShuangyuZhangHongShiYanLiuFengdeLiuJiaXuChunying(CollegeofMechanicalandElectricEn
4、gineering,ChangchunUniversityofScienceandTechnology,Changchun,Jilin130022,China)AbstractACO2laser-metalactivegaswelding(MAG)hybridweldingtechnologyisusedtoweldthehighstrengthsteelof7.0mmthick.Theeffectofthearcenergy,laserenergyanddistancebetweenlaserandMAGarc
5、onthedroplettransfercharacter,processstableandweldgeometryareinvestigated.Resultsindicatethatinputtingoflaserdecreasestheresistanceofplasmachannelsoflocatelaserkeyhole.Inthisway,arcisattractedandconstricted,whichstabilizesthearccathodespots.Thearcenergydeterm
6、inesthemodeofdroplettransfer,andthelaserenergyaffectsthefrequencyofdroplettransfer.Whenthelaserenergyislessthan4kW,thetransfermodeisshortcircuittransfer,orglobulartransferortransfermodebetweenshortcircuitandglobular.Whenlaserenergyexceeds4.68kW,thetransfermod
7、eisspraytransfer.Thedroplettransfermodeisveryimportantforachievingastableandrepeatableprocess:projected/spraytransfershouldbepreferredtoshort/globulartransfer.Distancebetweenlaserandarcsourcesmustbeata2~4mminordertoavoidturbulenceintheweldpoolanddisturbanceof
8、thekeyholeformationandtoachievesynergybetweentheprocesses.Keywordslasertechnique;CO2laser-MAGhybridwelding;spraytransfer;plasmashape;weldgeometry;droplettransfer收稿日期:2010-04-12;收到修改稿日期:20
