Abstract
The rate of metal evaporation from the cathode spot in a vacuum arc is calculated and expressed in approximate formulas as a function of arc current by use of estimated values of its radius and temperature on the basis of the cathode mechanism theory proposed recently. As the evaporation rate is in good agreement with the experimental erosion rate, these formulas for the radius, temperature, and rate of evaporation on the cathode spot as a function of arc current are very useful in the industrial field.
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