MIG焊熔滴过渡与电弧形态的观察与分析  

Observation and analysis of metal transfer and arc shape in MIG welding

作　　者：李科[1] 齐志龙 吴志生[1] 刘翠荣[1] 

机构地区：[1]太原科技大学材料科学与工程学院,030024

出　　处：《焊接》2016年第1期19-22,69,共4页Welding & Joining

基　　金：国家自然基金项目(51275332);山西省科技攻关项目(20130322005-03);大学生创新创业训练项目(G2015266)

摘　　要：利用高速摄影系统摄取MIG焊中熔滴与电弧的清晰图像,提出了测量熔滴尺寸、过渡频率、弧长和弧锥角的方法,并对测量结果进行分析。结果表明,随着焊接电流的变化,出现了四种熔滴过渡方式和三种典型的电弧形态。随着焊接电流的增大,熔滴尺寸减小,过渡频率、弧长和弧锥角均增大。究其原因,电流和电压的增大提高了电弧能量,加快了焊丝末端的熔化速度;同时,增大的电流增强了电弧力,促进了熔滴的脱离。Clear images of metal drops and arc in MIG welding were captured by high-speed photography system,methods to measure droplet size,transfer frequency,arc length and the cone angle of arc were proposed,and the measuring results were analyzed. Results show that there are four metal transfer modes and three arc shapes by changing welding currents. With the increase of welding current,droplet size decreases gradually,while transfer frequency,arc length and the cone angle of arc increase. Its reason is that the increment of welding current and voltage enhance the energy of arc,raising the melting rate of welding wire. Moreover,the increase of welding current enlarges the arc force,which promotes the droplet detaching from the wire.

关 键 词：MIG焊 熔滴过渡 电弧形态 高速摄影 

分 类 号：TG403[金属学及工艺—焊接]