Effect of laser pulse on recovery delay of arc plasma based on ion migration behavior in the pulsed laser–arc hybrid welding process
Effect of laser pulse on recovery delay of arc plasma based on ion migration behavior in the pulsed laser–arc hybrid welding process
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DOI：
10.1016/j.optlaseng.2012.09.006
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发表时间：
2013-02
影响因子：
4.6
通讯作者：
Liming Liu;Minghua Chen
中科院分区：
文献类型：
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作者：
Liming Liu;Minghua Chen
基于镁原子的动力学行为，研究了脉冲激光-电弧复合焊接过程中激光脉冲对电弧等离子体恢复延迟的影响。利用高速摄像机和光谱仪分别对镁原子在电弧等离子体中的行为进行了监测，并研究了激光脉冲对电弧等离子体的影响。结果表明，激光脉冲作用后，电弧等离子体不能立即恢复到原来的状态，过量Mg原子从电弧等离子体中逃逸需要0- 5 ms的时间，这取决于给定的参数。根据计算，镁离子在电弧等离子体导电通道中从阳极到阴极的时间小于0.1ms。激光脉冲消除后，基体表面激光小孔区的高温仍然存在，该区域Mg离子的持续供应是影响电弧等离子体恢复延迟的主要因素。
This paper presents the investigation on effect of laser pulse on the recovery delay of arc plasma during pulsed laser–arc hybrid welding of Mg alloy based on the dynamic behavior of Mg atoms. High-speed camera and spectrograph are employed to monitor the behaviors of Mg atom in the arc plasma and to characterize the effect of laser pulse on the arc plasma, respectively. It is found that the arc plasma cannot recover to its original state immediately after laser pulse action and it takes 0–5ms for the excessive Mg atoms to escape from the arc plasma depending on the given parameters. According to the calculation, time for Mg ions to travel from the anode to the cathode in the conduction channel of the arc plasma is less than 0.1ms. The high temperature of the laser keyhole region on the base material surface still exists when the laser pulse is removed and sustaining supply of the Mg ions from this region is the essential factor influencing recovery delay of the arc plasma.