Arc Deflection Length Affected by Frequency of Pulsed TIG Arc Welding with Lateral Gas

TIG arc welding is often used because this welding has high quality and strength. However, the heat transfer decreases with lateral gas and the heat transfer decrement causes welding defects. For this reason, it is necessary to prevent the arc deflection of the arc Thus, the transverse magnetic field is used The electromagnetic force affected by the external transverse magnetic field is applied to the arc in the opposite direction to the lateral gas. However, it is difficult to control the arc because of randomly changing the lateral gas direction and velocity. Thus, the pulsed arc is significant in order to prevent the arc deflection It has been reported that the increment of the current density at center of axis increased with increasing of pulsed frequency. The arc temperature was affected by the transient response because of not following increment of current. For this reason, the pressure gradient to axial direction is generated Therefore, it is considered that the arc stiffness increases with the increment of pulsed frequency. In this paper, the arc deflection length affected by the frequency of pulsed TIG arc welding with the lateral gas was elucidated. As a result, the arc deflection length decreased with increasing the pulsed frequency.