| 摘要 |
PROBLEM TO BE SOLVED: To keep a stable welding state in a consumable electrode AC-pulse arc weld, even if an electrode negative polarity current ratio is set at a large value.SOLUTION: A base current is conducted during an electrode minus polarity base period; a vibrating electrode minus polarity peak current Ipn is conducted during an electrode minus polarity peak period Tpn; the peak current is conducted during an electrode plus polarity peak period; and a base current is conducted during an electrode plus polarity base period. The oscillation waveform of the electrode minus polarity peak current is set into a waveform to decrease gradually as the time elapses. As a result, the force to vibrate solution droplets up and down is weakened as the solution droplets grow larger. Thus, the movement at the time when the solution droplet vibrates downward is reduced so that the generation of a short-circuiting can be suppressed to keep the molten state stably. |
