Abstract
Because heat treatment application using arc is restricted due to its energy concentration characteristic, authors have been developing magnetically driven arc technology to extend the heating area by arc torch. An alternating magnetic field is applied to a transferred arc and makes the arc column oscillate and therefore the heating area seems to be expanded. However, some anode spots appear on the processing material surface and the continuous arc motion is sometimes spoilt by these spots, which results in a non uniform heat treatment. The authors conclude that use of a non transferred arc is one of the appropriate methods to realize the more uniform heat treatment. Because no current flows into the anode with the non transferred arc, no such spot generation can be expected on the heating object. In this research, the magnetically driven non transferred arc generating device is developed according to the theory of the conventional magnetically driven transferred arc, and generation of plasma jet and its power control with input arc current are confirmed.
