Arc Deflection Length Affected by Transverse Rotating Magnetic Field with Lateral Gas as Function of Arc Current

摘要

TIG arc welding using shielding gas and tungsten electrode obtains high quality welding. Thus, it is often used in the welding industry. However, the arc deflects because of lateral gas and the deflection causes inappropriate heat transfer. Shielding gas flow rate increases in order to prevent the instability affected by the arc deflection. However, the increasing of shielding gas flow rate causes the turbulence, then the weld defects such as blowhole occurs. Thus, the external magnetic field is applied to the arc in order to stabilize the arc using low amount of shielding gas. The arc deflects because of magnetic field. However, the transverse DC magnetic field cannot prevent the arc deflection affected by lateral gas from all direction. When the rotating magnetic field (RMF) is applied to the arc, the arc rotates because of electromagnetic force whose direction changes like clock hands. It is assumed that the arc deflection length affected by lateral gas decreases with increasing the arc current under the RMF, and the RMF prevents the arc deflection affected by lateral gas from all directions. In this paper, the arc deflection length affected by the RMF with lateral gas as a function of the arc current was elucidated in order to know the effect of the RMF for arc stabilization. Specifically, the arc deflection length affected by the arc current is measured by high speed video camera. As a result, the arc deflections length decreases with increasing the arc current.