Analysis of plasma characteristics and conductive mechanism of laser assisted pulsed arc welding
Analysis of plasma characteristics and conductive mechanism of laser assisted pulsed arc welding
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激光辅助脉冲电弧焊等离子体特性及导电机理分析
DOI：
10.1016/j.optlaseng.2016.12.016
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发表时间：
2017-05
影响因子：
4.6
通讯作者：
hongtao Ding
中科院分区：
文献类型：
--
作者：
qinghua Wang;yanqing Li;hong Zhang;hongtao Ding
研究了激光辅助脉冲电弧焊接过程中电弧等离子体的形态和光谱特性。利用高速摄像机同步观测了电弧等离子体的形状，并利用光谱仪获得了等离子体的发射光谱。采用著名的玻尔兹曼作图法和斯塔克展宽法分别计算了电子温度和密度。研究了激光辅助电弧复合焊接引弧的导电机理，发现等离子体电流在电场作用下向电弧阳极移动。因此，在锁孔和导丝尖端之间形成了显著的抛物线通道。这种通道成为电弧与熔池之间能量转换的主要方式。等离子体电阻率的计算结果表明，激光等离子体具有低电阻率作为导电沟道形成的起点。随着激光脉冲宽度的增加，等离子体辐射谱强度和等离子体电子密度增加，电子温度降低。
This study aims to investigate the arc plasma shape and the spectral characteristics during the laser assisted pulsed arc welding process. The arc plasma shape was synchronously observed using a high speed camera, and the emission spectrum of plasma was obtained by spectrometer. The well-known Boltzmann plot method and Stark broadening were used to calculate the electron temperature and density respectively. The conductive mechanism of arc ignition in laser assisted arc hybrid welding was investigated, and it was found that the plasma current moved to the arc anode under the action of electric field. Thus, a significant parabolic channel was formed between the keyhole and the wire tip. This channel became the main method of energy transformation between the arc and the molten pool. The calculation results of plasma resistivity show that the laser plasma has low resistivity as the starting point of conductive channel formation. When the laser pulse duration increases, the intensity of the plasma radiation spectrum and the plasma electron density will increase, and the electron temperature will decrease.
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