以5.0 mm厚高强钢板为实验材料,采用Nd:YAG激光-MAG电弧复合焊接方法,研究了电弧电压与焊接电流的大小对复合焊接熔滴过渡特征、工艺稳定性和焊缝形貌的影响.结果表明:当激光功率P＝2.5 kW、焊接速度v＝1.2 m/min不变时,发现电弧电压U＝24 V,焊接电流I＜180 A时或当焊接电流I＝180 A,电弧电压U＜24 V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,且焊缝表面飞溅较多;焊接电流I≥180 A时或电弧电压U≥24 V时,熔滴的过渡模式为射滴过渡,且焊缝形貌较好.

In this essay,the experimental material is 5.0 mm thick high strength steel plate,and analyzes the weld shaping,process stability and droplets transfer characteristics of Nd:YAG laser-MAG hybrid welding with different the arc energy.Experimental results show that:when the laser power P＝2.5 kW and welding speed v＝1.2 m/min doesn't change.Found that when welding current I＜180 A,current voltage U＝24 V,or welding current I＝180 A current voltage U＜24 V,the transfer mode is short circuit transfer,or globular transfer,or transfer mode between short circuit and globular.When welding current I≥180 A,or current voltage U≥24 V,the transfer mode is spray transfer and the better appearance is visible.