| 摘要 |
<p>A control method for AC pulse arc welding performed upon application of cyclic AC welding current is provided. The welding current has a cycle including an electrode negative polarity period and an electrode positive polarity period subsequent to the electrode negative polarity period. In the control method, an electrode negative polarity base current (Ibn) and a subsequent electrode negative polarity peak current (Ipn) are applied during the electrode negative polarity period. The electrode negative polarity base current has an absolute value smaller than a first critical value, and the electrode negative polarity peak current has an absolute value greater than the first critical value. Then, an electrode positive polarity peak current (Ip) is applied during the electrode positive polarity period. The electrode positive polarity peak current has a value greater than a second critical value.</p> |
