YAG激光等离子弧复合焊接热源光谱特征分析

The Spectrum Analysis on the YAG-plasma Hybrid Welding of Stainless Steel

利用所研制的YAG激光等离子弧复合热源,进行了不锈钢激光等离子弧复合焊过程的电弧、光致金属蒸气成像观察和光谱分析。研究结果表明,不锈钢的激光焊金属蒸气云与等离子弧具有完全不同的动态特征,其线光谱峰出现在不同的波长带,激光焊Ar谱线波长出现在520 nm,等离子弧焊的Ar谱线波长均大于696 nm,当激光与等离子弧复合,线光谱是两者的组合,谱线强度增大,可观察到Fe、Cr和Ni等的特征光谱产生。复合焊线光谱特征与激光功率、焊接电流、热源间距和热源顺序密切相关,当热源间距很大时,复合焊的光谱特征实际上是两种热源特征光谱的简单组合,这主要取决于激光与电弧的相互作用。

The laser-plasma hybrid welding of stainless steel was conducted to investigate the hybrid arc,light induced metal vapor and plasma arc spectrum features in this paper. The result of spectroscopic analysis show that the spectra from the plum of YAG laser welding is different from the plasma arc in typical peak line. The argon spectral line registered the plum set on 520 nm, but the argon spectral line registered the plasma arc was on 696 nm or more lager. When the laser was combined with the plasma arc, the spectrograph occurs the plum argon line plus the plasma arc argon line, and the radiation of all argon lines are much high than both the radiation of argon line registered by the plum of laser welding only , and the radiation of argon line registered by the plasma arc welding only. In addition, some typical iron line, chromium line and nickel line were found in hybrid spectrograph, which change depending on the laser power, welding current, distance between the two heat source action axes line, and the methods of heat source assignment.