Coupling Discharge Between Keyhole Plasma and Arc Plasma in Laser-Arc Welding of Mg Alloy
Coupling Discharge Between Keyhole Plasma and Arc Plasma in Laser-Arc Welding of Mg Alloy
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DOI：
10.1109/tps.2014.2314461
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发表时间：
2014-04
影响因子：
1.5
通讯作者：
Minghua Chen;Chenbin Li;Liming Liu
中科院分区：
文献类型：
--
作者：
Minghua Chen;Chenbin Li;Liming Liu
本文研究了激光电弧焊中激光锁孔等离子体与电弧等离子体的耦合放电过程。采用光谱诊断方法对不同位置的单弧等离子体和混合弧等离子体的特征进行了比较。结合等离子体行为观察，分析了激光锁孔等离子体与电弧等离子体之间的粒子交换。在激光弧焊过程中，锁孔等离子体作为电弧等离子体与工件之间的良好连接器，导致了电子流的集中。耦合放电导致混合电弧等离子体沿柱的局部热力学平衡状态存在差异。混合电弧等离子体的锁孔部分与绝对LTE状态的偏差最小，有利于焊接过程中电能向热能的转化。
This paper describes investigations on the coupling discharge process between laser keyhole plasma and arc plasma during laser-arc welding. The characteristics of single arc plasma and hybrid arc plasma in different locations were comparably estimated by spectral diagnosing. Together with the plasma behavior observation, the particle exchanges between laser keyhole plasma and arc plasma were analyzed. During laser-arc welding, the keyhole plasma acts as an excellent connector between arc plasma and workpiece, resulting in a concentration of electron flows. Coupling discharge leads to the difference in the local thermodynamic equilibrium (LTE) state along the column of the hybrid arc plasma. The keyhole part of the hybrid arc plasma possesses the smallest deviation from absolute LTE state, which benefits the transfer from electric energy to heat during welding.