Effect of electric arc on laser keyhole behavior based on direct observation during low power pulsed laser-arc hybrid welding process
Effect of electric arc on laser keyhole behavior based on direct observation during low power pulsed laser-arc hybrid welding process
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DOI：
10.1016/j.optlaseng.2013.04.010
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发表时间：
2013-10-01
影响因子：
4.6
通讯作者：
Li, Chenbin
中科院分区：
文献类型：
--
作者：
Liu, Liming;Chen, Minghua;Li, Chenbin
采用直接观察法研究了脉冲激光-电弧复合焊接过程中电弧对激光小孔行为的影响。利用辅助照明激光器和相应的光调制，实现了对激光小孔出口和弧光等离子体的直接同步观测。实验结果表明，激光脉冲作用后，小孔出口不会立即关闭，关闭时间取决于焊接工艺参数。较大的电弧电流会缩短小孔出口的存在时间。弧光等离子体柱伸入激光小孔，对小孔内壁产生压力，阻碍小孔坍塌，导致小孔出口寿命延长。弧柱向小孔内延伸，增加了小孔出口周围液态金属的表面张力，防止了小孔出口坍塌。(C)2013爱思唯尔有限公司。保留所有权利。
This paper presents an investigation on effect of electric arc on laser keyhole behavior based on direct observation during pulsed laser-arc hybrid welding process. Direct and synchronous observation of laser keyhole outlet and arc plasma is achieved by means of an assistant illuminating laser and corresponding optical modulation. Experimental results show that after laser pulse action the keyhole outlet does not close immediately and the time depends on the welding parameters. Larger arc current will decrease the existing time of keyhole outlet. Extension of arc plasma column into the laser keyhole gives the pressure to the inner keyhole wall, and consequently hinders the keyhole from collapse, resulting in the longer existence of keyhole outlet. The surface tension of the liquid metal around the keyhole outlet increases due to the extension of arc column into the keyhole, which also prevents the keyhole outlet from collapse. (c) 2013 Elsevier Ltd. All rights reserved.