Abstract
Free-burning arc in air on copper electrodes has usually large fluctuations in current and voltage. When a copper wire is used as a positive electrode, it is found out that the fluctuations in arc current and voltage are remarkably decreased . The tip of the wire electrode melts for the heat of arc and shrinks globularly. It is also found out that the dependence of arc voltage upon arc length is linear even when the gap length is shorter than 5 mm. Consequently, the precise axial electric field strength of the arc column can be determined from the gradient of the arc voltage vs. arc length characteristics.
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