以一种中碳超高强度钢板为试验材料, 进行了CO2激光-熔化极活性气体保护焊(Metal active gas, MAG)电弧复合焊接和单独MAG焊接试验。采用高速摄像系统观测熔滴过渡形式的变化, 并采集焊接过程中的电弧和熔滴过渡的图像, 通过采集到的图像深入分析熔滴过渡的电磁收缩力的计算。研究表明, 不同的熔滴过渡形式电磁收缩力的计算方法不同;随着焊接电流的增加, 熔滴过渡形式由大颗粒过渡变为小颗粒过渡, 减小了熔滴过渡的直径;激光的加入影响了熔滴的电磁收缩力, 通过试验分析出不同熔滴过渡形式下激光-电弧复合焊熔滴过渡的电磁收缩力的计算公式。

A CO2 laser-metal active gas(MAG)arc hybrid welding and single MAG welding are used to weld the ultra high strength steel plate. A high-speed video system is used to monitor the changes in droplet transfer type as well as to collect the arc and droplet transfer images during welding. The calculation of electromagnetic contraction force of droplet transition by the images are studied. The research shows that different droplet transfer types result in different calculation methods of electromagnetic contraction force. With the increase of the welding current, droplet transfer type is changed from larger particles transition into small particles, and the diameter of the droplet transition is reduced. The introduction of laser affects electromagnetic contraction force. Calculation formula of the electromagnetic contraction force of the CO2 laser-MAG arc hybrid welding droplet transition on different droplet transfer types is analyzed.