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《CO_2激光_MAG电弧复合焊接_省略_数对熔滴过渡特征和焊缝形貌的影响_刘双宇》由会员上传分享，免费在线阅读，更多相关内容在行业资料-天天文库。
1、第37卷第12期中国激光Vol.37,No.122010年12月CHINESEJOURNALOFLASERSDecember,2010文章编号:0258-7025(2010)12-3172-08CO2激光-MAG电弧复合焊接工艺参数对熔滴过渡特征和焊缝形貌的影响*刘双宇张宏石岩刘凤德刘佳徐春鹰(长春理工大学机电工程学院,吉林长春130022)摘要以7.0mm厚高强钢板为试验材料,采用CO2激光-熔化极活性气体保护焊(MAG)电弧复合焊接方法,研究了电弧能量、激光能量、光丝间距等参数对复合焊接熔滴过渡特征、工艺稳定
2、性和焊缝形貌的影响。结果表明,CO2激光-MAG电弧复合焊接过程中,激光的加入,降低了激光匙孔附近等离子体通道的电阻,使电弧被吸引并压缩至激光匙孔处,从而使电弧阴极斑点更加稳定。电弧能量决定熔滴过渡的模式,激光能量主要影响熔滴的过渡频率。当电弧能量小于4kW时,熔滴过渡模式为短路过渡和颗粒过渡或是二者的混合过渡;当电弧能量大于4.68kW时,熔滴的过渡模式为射滴过渡。熔滴的过渡模式对获得稳定的可重复焊接工艺至关重要,射滴过渡比短路过渡更有利于焊接过程的稳定。热源间距保持在2~4mm的范围内,避免熔滴干扰激光匙孔和
3、熔池产生紊流。关键词激光技术;CO2激光-MAG电弧复合焊接;射滴过渡;等离子体形貌;焊缝形状;熔滴过渡中图分类号TG456.7文献标识码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
