Spectroscopic characterization of laser-induced plasma created during welding with a pulsed Nd:YAG laser
Spectroscopic characterization of laser-induced plasma created during welding with a pulsed Nd:YAG laser
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DOI：
10.1063/1.365198
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发表时间：
1997-05
影响因子：
3.2
通讯作者：
D. Lacroix;G. Jeandel;C. Boudot
中科院分区：
文献类型：
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作者：
D. Lacroix;G. Jeandel;C. Boudot
对不锈钢和其它材料（铁和铬）焊接过程中产生的激光诱导羽流进行了光谱研究。使用平均功率为1000 W的脉冲Nd：YAG激光器。研究了电子温度和电子密度随焊接工艺参数的变化规律。我们使用的工作功率从300到900 W和脉冲持续时间之间的1.5和5毫秒。保护气体，如氮气和氩气的影响已被考虑在内。温度和密度的计算是基于对发射峰的相对强度和形状的观察。我们假设等离子体处于局部热平衡。温度用玻尔兹曼作图法计算，密度用铁谱线的斯塔克展宽计算。电子温度在4500-7100 K之间变化，电子密度在3×1022和6.5×1022 m−3之间。利用逆韧致辐射理论计算了激光束在等离子体中的吸收。
A spectroscopic study of a laser-induced plume created during the welding of stainless steel and other materials (iron and chromium) has been carried out. A pulsed Nd:YAG laser of 1000 W average power is used. The evolutions of the electron temperature and electron density have been studied for several welding parameters. We use working powers from 300 to 900 W and pulse durations between 1.5 and 5 ms. The influence of shielding gases like nitrogen and argon has been taken into account. Temperature and density calculations are based on the observation of the relative intensities and shapes of the emission peaks. We assume that the plasma is in local thermal equilibrium. The temperature is calculated with the Boltzmann plot method and the density with the Stark broadening of an iron line. The electron temperatures vary in the range of 4500–7100 K, electron density between 3×1022 and 6.5×1022 m−3. The absorption of the laser beam in the plasma is calculated using the Inverse Bremsstrahlung theory.