外加交变磁场对MIG焊电弧及射流过渡的影响  

Influence of External Alternating Magnetic Field on MIG Welding Arc and Jet Transition

作　　者：韩琦 江淑园[2] HAN Qi;JIANG Shuyuan(School of Aeronautical Engineering,Jiangsu Aviation Technical College,Zhenjiang 212134,China;College of Aeronautical Manufacturing Engineering,Nanchang Hangkong University,Nanchang 330063,China)

机构地区：[1]江苏航空职业技术学院航空工程学院,江苏镇江212134 [2]南昌航空大学航空制造工程学院,江西南昌330063

出　　处：《热加工工艺》2023年第21期68-72,共5页Hot Working Technology

基　　金：江苏航空职业技术学院课题(JATC21010203);江西省教育厅科技项目(DA201403303)。

摘　　要：利用高速摄影系统采集交变间歇磁场下MIG焊的电弧和射流过渡图片。通过受力分析,研究不同磁场方向下电弧和射流过渡的变化。结果表明:保持励磁频率为40 Hz,励磁电流在0~1.0 A范围内,随着磁场方向在纵向由向下到向上的周期变化,电弧绕焊丝轴线呈周期性顺时针、逆时针旋转,且出现扩张和收缩现象。焊丝末端导电流体由液锥、液流束和细小球状熔滴组成。当励磁电流为0 A时,液锥和液流束沿焊丝轴向下垂,未发生偏转,熔滴沿着液流束末端向熔池内平稳过渡。当励磁电流为0.2、0.6 A时,液流束呈短粗状,小角度偏离焊丝轴向做顺、逆时针旋转。当励磁电流达到0.8、1.0 A时,液流束呈细长状,导电流体呈“S”形,大角度偏离绕焊丝轴向做周期性逆时针和顺时针旋转。The high-speed photography system was used to collect the images of MIG welding arc and jet transition under alternating intermittent magnetic field.Through force analysis,the changes of arc and jet transition under different magnetic field directions were studied.The result shows that under the excitation frequency of 40 Hz and the excitation current range of0-1.0 A,as the alternating magnetic field periodically changes from downward to upward in longitudinal direction,the arc rotates clockwise and counterclockwise periodically around the wire axis,and it expands and contracts.The conductive fluid at the end of the wire consists of a liquid cone,a liquid stream and a small spherical droplet.When the excitation current is 0A,the liquid cone and the liquid stream sag along the axis of the welding wire without being deflected,and the droplet transits smoothly into the molten pool along the end of the liquid stream.When the excitation current is 0.2,0.6 A,the liquid stream is short and thick,and it deviates from the axis of the welding wire with a small angle and rotates clockwise and counterclockwise.When the excitation current reaches 0.8,1.0 A,the liquid stream is slender,and the liquid stream shows an"S"shape,deviating from the axis of the welding wire with a large angle and rotating periodically counterclockwise and clockwise.

关 键 词：交变间歇磁场 磁场方向 MIG焊 电弧 射流过渡 

分 类 号：TG444.74[金属学及工艺—焊接]