Arc erosion pattern shows that spot craters locate on the phases with weak voltage withstanding, whose size, morphology and distribution determine the character of the arc spots.
阴极斑点优先在材料承载电压能力低的弱相表面形成，弱相尺寸、形貌和分布决定了阴极斑点的几何特征。
A mathematical model of fume diffusion in welding process was founded by considering welding arc as a spot source of generating fume and supplying the turbulent diffusion theory.
把焊接电弧作为一个发尘点源，应用大气湍流扩散理论，建立了焊接过程中烟尘扩散的数学模型。
However, the constriction of arc-column can not affirm arising anode melting and anode spot, which can be explained by an idea of collapse time.
而收缩的出现并不一定产生阳极熔化和出现阳极班点，这可用塌缩时间的概念得到解释。本文应用磁流体不稳定性原理，对实验现象进行了分析和讨论。
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