Temperature difference between constant and pulsed arc affected by current increment ratio at peak current near anode

Summary form only given. The pulsed arc can be controlled by the welding parameters, such as the current frequency, base and peak current and duty ratio. However, these parameters of the pulsed arc welding are many and complicated. When these parameters are changed, the temperature and arc flow velocity are changed. Some researchers have researched the pulsed arc in order to prevent the weld defect. In other research, when the current frequency becomes high, the radial direction of the weld pool decreases, and the depth direction of the weld pool increases. This means that the current increment ratio per unit time (di/dt) contributes to the magnitude of the current density and the plasma flow velocity. Then, the contribution of the expansion to the radial direction with the Marangoni effect and drag force, and melting the depth direction with the electromagnetic force are considered. In this research, the temperature change with time near anode in pulsed arc affected by current increment ratio (di/dt) was elucidated in order to obtain more knowledge of melting model of pulsed arc. The temperature difference between the constant and pulsed arc current is to be 2000 K in the case of about 1000 A/s of the different of current increment ratio of pulsed arc.