| 摘要 |
<p>In a pulse welding apparatus such as a pulse arc welding apparatus or a short-circuiting arc welding apparatus utilizing pulse discharge, development of welding defect in the welded beads is eliminated that results from irregular timing for removing molten mass caused by magnetic blow phenomenon of arc due to difference in the shape of welding joint or due to difference in the earth point. A pulse current supplied to a material to be welded is divided into groups of pulses. Gaps among the pulses in the pulse current groups, base current period supplied between the pulse current groups, base current, pulse peak and pulse width of the pulses, and, in the case of the short-circuiting arc welding, the short-circuiting period and arcing period, are instantaneously controlled depending on the arc length that is detected in order to instantaneously obtain ideal arc length. By doing so, the molten mass can be regularly removed and moved onto the material to be welded. Even in the short-circuiting arc welding, furthermore, variation decreases between the short-circuiting period and the arcing period. Therefore, growth and removal of the molten mass can be controlled independently of the magnetic blow phenomenon of arc, and favorable welding is carried out to improve the quality irrespective of a change in the shape of welding joint and earth point in real arc.</p> |
