采用Red lake高速摄影系统观察了扫描激光-热丝焊接过程中焊丝熔入行为,分析了光丝间距、扫描激光及焊丝加热等工艺因素对焊丝熔入行为的影响。研究结果表明,当光丝间距处于-1 mm~1 mm范围内时,填充焊丝可实现连续稳定的液桥过渡;加入扫描激光后,焊丝在熔入过程中会出现一定程度的摆动,且随着激光扫描幅度增加,焊丝摆动幅度先增后减;对焊丝进行加热后,焊丝熔入方式包括连续液桥过渡、熔滴过渡和电弧过渡3种,且焊丝摆动幅度较焊丝不预热时明显减小。 Red lake high-speed photography system was used to observe the welding wire penetration during the scanning laser-hot wire welding process. The effects of the welding wire spacing, scanning laser and wire heating on the wire melting behavior were analyzed. The results show that the filler wire can achieve a continuous and steady transition of the liquid bridge when the distance between the light filaments is in the range of -1 mm to 1 mm. After adding the scanning laser, the welding wire will swing to a certain degree during the melting process, With the increase of laser scanning amplitude, the amplitude of wire swing increases first and then decreases. After the wire is heated, the wire welding methods include continuous liquid bridge transition, droplet transfer and arc transition, and the amplitude of wire swing is obviously higher than that of wire without preheating Decrease