基于光谱诊断的热源间距对激光-脉冲GMAW复合焊等离子体物理特性影响研究

激光电弧复合焊中，热源间距会影响到等离子体物理特性，进而影响到焊接过程的稳定性及焊接质量。 基于Boltzmann作图法和Stark展宽法研究了不同热源间距下的激光-脉冲GMAW复合焊峰值阶段的温度场和电子密度分布，并结合高速摄影手段分析了热源间距对温度和电子密度的影响规律。 光谱诊断结果表明，随着热源间距的增大，激光等离子体的温度和电子密度都没有明显的变化;电弧温度出现下降，电弧电子密度则呈现先增高后降低的趋势。

Study of the Effect of Heat Source Separation Distance on Plasma Physical Properties in Laser-Pulsed GMAW Hybrid Welding Based on Spectral Diagnosis Technique

In the present paper, the authors calculated the plasma’s peak electron temperatures under different heat source separation distance in laser- pulse GMAW hybrid welding based on Boltzmann spectrometry. Plasma’s peak electron densities under the corresponding conditions were also calculated by using the Stark width of the plasma spectrum. Combined with high-speed photography，the effect of heat source separation distance on electron temperature and electron density was studied. The results show that with the increase in heat source separation distance, the electron temperatures and electron densities of laser plasma did not changed significantly. However, the electron temperatures of arc plasma decreased, and the electron densities of arc plasma first increased and then decreased.