Penetration depth in welding pool affected by current increment ratio in pulsed arc

Summary form only given. The high-frequency pulsed TIG arc welding has been developed because it can control the Lorentz Force which is very important factor in order to become deep welding pool. In this welding, the transient arc controlled by the pulsed current waveform, especially the current increment ratio (di/dt), includes the current peak, base, and frequency. This paper discusses the increasing penetration depth in welding pool affected by Lorentz Force controlled by the parameters di/dt. The waveform is that the current changes from 150 to 200 A with changing the di/dt, because of analysis of electromagnetic physical phenomena caused by thermal inertia. And then, the pulsed current periodic waveform is used for analyzing of increment in time of penetration depth in welding pool affected by Lorentz Force. As a result, the arc conductivity depends on temperature near anode at welding pool becomes small with increasing the pulsed current frequency and di/dt, however the heat input energy of current density concentrated high at the anode for electromagnetic physical phenomena caused by thermal inertia in this research model. And then, the penetration depth clearly increased with increasing the pulsed current frequency.