大功率YAG激光-MAG复合热源的光谱诊断与分析

Diagnosis and Analysis of High Power YAG Laser and MAG Arc Hybrid Source with Spectral Information

大功率YAG激光-MAG复合热源具有广泛的工业应用前景,其等离子体状态的诊断对于指导复合热源发展方向、优化复合参数具有重要意义。通过建立的中空探针光谱扫描系统,采用荷兰Avaspec-FT-2快速数字光谱仪,横向扫描焊接电弧等离子体,采集YAG激光-MAG复合等离子体不同空间位置的光谱;通过计算得到其特定辐射谱段的空间分布,对比激光复合前后等离子体辐射的变化;并结合高速摄像照片,探讨其耦合机理。进一步选取特定谱线(FeⅠ),采用Boltzmann图法对复合热源等离子体的空间电子温度进行计算;研究结果表明,YAG激光-MAG电弧复合后,等离子能量更靠近熔池,集中作用于焊接试板,其能量作用区域展宽;在电弧中心区造成电子温度上升。

High power YAG laser and MAG arc hybrid source is a promising material processing heat source for future industry application.Diagnosis of the plasma state is critical for better understanding of the coupling effect,application of the source and optimization of the hybrid parameters.Through establishing a hollow probe spectral collecting system,Avaspec-Ft-2 high speed digital spectrometer was applied for collecting the spectral information of hybrid arc plasma.The hollow probe scans the plasma body to acquire the spatial distribution of the YAG laser-MAG hybrid arc spectrum.The radiation intensity in specific spectral zone was acquired for analysis of the radiation variation when the laser beam was hybrid with the MAG arc.High speed photo was also applied for comparison of the plasma with and without laser beam coupling.Furthermore,line spectra of FeⅠwere selected for calculating the electronic temperature of the hybrid plasma with Boltzmann plot method.The results show that energy of the hybrid plasma focused on the weld plate with high intensity and wider acting zone.The electronic temperature increased in the center of the hybrid plasma.