以10 mm的Q345B钢板作为实验材料，采用激光-MAG复合焊接技术，通过调整焊接电流，送丝速度，焊接速度，光丝间距等复合焊接参数，探索Y型坡口高速打底焊的可行性及相关工艺适应性研究。实验过程中借助高速摄像和电压电流采集器，分析焊接电弧和熔滴过渡的行为特征。结果表明，激光-MAG复合焊能实现最大6 mm钝边以及最小角度为35°坡口的高速打底焊，焊速为1 m/min，对间隙和错边的适应性较好，激光与电弧电流的匹配对焊接稳定性有很大的影响。

Using 10 mm Q345B steel plate as experimental material, laser-MAG hybrid welding was used to explore the feasibility of high speed backing welding of Y-shaped groove by adjusting welding current, wire feeding speed, welding speed, wire spacing and other hybrid welding parameters. During the experiment, the behavior characteristics of welding arc and droplet transition were analyzed by means of high-speed camera and voltage and current collector. The results show that laser-MAG hybrid welding can realize high speed backing welding with a maximum of 6 mm blunt edge and a minimum angle of 35°groove. The welding speed is 1 m/min, and the adaptability to the gap and the wrong side is better. The matching of laser and arc current has a great influence on the welding stability.