激光功率对CO_2激光-MAG电弧复合焊电弧与熔滴行为的影响  

Influence of Laser Power on Arc and Droplet Behaviors in Droplets on CO_2 Laser-MAG Arc Hybrid Welding

作　　者：刘凤德[1] 张宏[1] 杜劭峰 刘双宇[1] 王宇琪 

机构地区：[1]长春理工大学机电工程学院,长春130022 [2]内蒙古第一机械制造集团有限公司,包头014032

出　　处：《机械工程学报》2013年第4期75-82,共8页Journal of Mechanical Engineering

基　　金：新世纪优秀人才计划(XSJ2008-1);国际科技合作计划(2009DFB70360)资助项目

摘　　要：采用高速摄像系统观测熔滴过渡模式和等离子体形态的变化,并采集焊接过程中的电弧和熔滴图像,利用电弧分析仪记录电弧信号,通过试验深入研究激光功率对CO2激光-熔化极活性气体保护焊(Metal active gas,MAG)电弧复合焊接的电弧形态、焊接稳定性、熔滴过渡频率的影响。研究表明,焊接电流的增加减小了实际热源间距,并且实际热源间距在2 mm附近效果最佳;带电粒子在主辅导电通道内的运动产生扰动或漂移、焊接模式的跳变和过渡模式的改变是电流、电压波形出现紊乱和尖角波形的主要原因;激光的加入降低了熔滴过渡频率和过渡稳定性;焊接电流为160A、180 A时,激光-电弧复合焊接的熔滴过渡频率均随着激光功率的增加而先减小后增大,但其过渡频率介于160 A和180 A电弧焊接时熔滴过渡频率之间。A high-speed video system is used to monitor the changes in droplet transfer mode and plasma morphology as well as to collect the arc and droplet images during welding. An arc analyzer is used to record the signals of arc. The effects of laser power on the arc shape, welding stability and droplet transfer frequency during CO2 laser-metal active gas（MAG） arc hybrid welding are studied. The results show that an increase in welding current reduced the actual distance between laser and arc, which is suitable at 2 mm. The main reasons for the appearance of the turbulence and sharp waveform in the waves of current and voltage are attributed to the disturbance or drift of the charged particles in the main and auxiliary current channels, the skip of welding mode and the change in the droplet transfer mode. The introduction of laser reduces the frequency and stability of the droplet transfer. The frequency of the droplet transfer shows a first decrease and then increase with increasing laser power when the welding current is either 160 A or 180 A, which, however, is between the values of single arc welding under 160 A and 180 A.

关 键 词：激光-电弧复合焊接 激光功率 电弧形态 熔滴过渡 

分 类 号：TG456[金属学及工艺—焊接]