多丝熔化极气体保护焊中, 由于电弧间的相互干扰, 电弧工作状态不稳定, 进而影响焊接过程稳定性和焊接质量。 基于Boltzmann作图法测量电子温度场和Stark展宽法研究了多丝工作条件下电弧的电子温度分布和电子密度分布, 结合高速摄影获得的定量化结果, 给出电弧间干扰的定量化分析。 光谱诊断结果表明双丝情况下, 当加入电弧工作电流大于原电弧时, 原电弧电子温度中心向新加入电弧稳定偏移, 而且偏向新电弧一侧电子密度明显增加, 而新电弧工作电流等于原电弧时, 电弧电子温度和电子密度分布都反映出原电弧工作状态不稳定。 三丝情况, 由于加入第三根电弧, 导致中间电弧电子温度分布变得复杂, 而其电子密度分布接近于单丝工作情况。

During the multi-wire GMAW, the working state of the arc will become unstable because of the arcs interference, which will affect the stability of welding process and welding quality. In this paper, the distribution of the electron temperature of the arc have been researched based on Boltzmann spectrometry. Electron densities under different conditions have also been calculated based on Stark width of the plasma spectrum. Combined with the analysis of high-speed photography, quantitative analysis of the arc interference can be obtained. For double wire case, the results of spectral diagnosis show that when the adding arc current is larger than the original arc, the temperature center of original arc is shifted to the new arc side, and the electron density of the original arc near new arc side is obviously increased. While the current of the new arc is equal to the original arc, the temperature and electron density distribution of the original arc all lead to the instability. In the case of triple-wire, the addition of the third arc causes the temperature distribution of intermediate arc become complex, and its electron density distribution is close to that of single wire case.