大电流空心阴极真空电弧的光谱特征
Spectral Characteristics of High Current Hollow Cathode VacuumArc
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摘要: 在水冷铜阳极的条件下,给出了空心阴极真空焊接电弧弧光光谱的频域及空间分布的测试结果,分析了大电流下电弧的光谱特征。结果表明,空心阴极真空焊接电弧的光谱分布特征为连续辐射背景上的线光谱结构,线光谱特征的存在,使得对电弧成分的选择性研究成为可能。大电流真空电弧光谱中在蓝色谱段出现了大量的一次氩离子谱线,因而电弧颜色为蓝色。真空电弧光谱的空间分布特征表明,利用电弧相应的线光谱可以了解电弧内部成分组成以及电弧等离子体内部的输运过程。本文初次建立了对空心阴极真空焊接电弧弧光光谱的认识,为低气压焊接电弧的研究指出了方向。Abstract: On the condition of 100 A welding current the frequency of optical emission from argon plasma in a hollow cathode has been recorded as 200~1 000 nm with water cooled copper anode.Spatial distribution (along the arc length) of hollow cathode vacuum arc spectrum is also given.The observed spectra shows that strong Ar Ⅰ and Ar Ⅱ lines are superimposed on a weak continuum.Large amounts of Ar Ⅱ spectral lines apppear in the region of 350~510 nm,which results in a blue hollow cathode vacuum arc.All the results indicate that the spectral line can be used to analyze the mass and energy transfer in hollow cathode vacuum arc welding plasma arc.
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Keywords:
- hollow cathode /
- vacuum arc welding /
- spectral characteristics
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