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在CO_2激光和GMAW-P复合焊接过程中,焊接速度是用来控制对工件热输入的重要参数,但是焊接速度的改变也会影响到等离子行为及熔滴过渡。文中研究了焊接速度对激光致等离子体形态、熔滴过渡和输出电信号的影响,通过高速摄影观察了焊接过程激光等离子体和熔滴过渡,采集了焊接过程电流电压信号,试验结果表明,较低的焊接速度会产生大量的激光致等离子体,这种等离子体的产生改变了熔滴内电流分布,阻碍了熔滴过渡,增加了弧长及熔滴尺寸。
In CO 2 laser and GMAW-P composite welding, the welding speed is used to control the heat input of the important parameters of the workpiece, but the welding speed changes will also affect the plasma behavior and droplet transfer. The effects of welding speed on laser induced plasma morphology, droplet transfer and output electrical signal were studied in this paper. Laser plasma and droplet transfer were observed during high speed photography and current and voltage signals during welding were collected. The experimental results show that the welding speed The low welding speed produces a large amount of laser-induced plasma, which changes the current distribution inside the droplet, impedes the droplet transfer, increases the arc length and droplet size.