Arc tracks notes the behaviour of the arc bases on contacts and gives informations to the arc stress by changed surface images. The tracks are optically different depending on polarity, gap length, some materials and arc movement most of all. On this occasion, the degree of the destruction of the contact-surface is shown by more or less deep erosions. With the presented paper examples are given for arc tracks under different conditions in vacuum, air and other gases. Furthermore the influence of contact material and his surface topography respective layers is shown. Microscopic investigations of monocristalline materials with chemical cleaned surface or prepared surface layers gave an insight for the electrode-base mechanisms. The results were discussed with regard to theoretical and practical aspects. On the basis of the results it is possible to assess demands and events with the movement of the arc.
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