| 摘要 |
PURPOSE:To execute the control quickly and securely by rectifying a detecting current, integrating it for an optional cycle to form an integral wave shape, and further maintaining its peak value by a holding circuit for said cyele to form it to a rectangular wave shape, comparing it with a reference current to control an approaching speed of one material to be welded. CONSTITUTION:A current flowing between materials to be welded 1, 1' is detected by a rectifying and detecting circuit through a current transformer 4 and a resistance 5 to be rectified and is made to form a wave shape, and is integrated at every half-cycle through an integraing circuit 8 to form an integral wave shape. This integral wave shape is made to form a rectangular wave shape through an integral peak value holding circuit 9. The wave shape of this rectangular wave shape is compared with a reference current value by a comparing circuit 10, to device its deviation. In accordance with its deviation, a flash speed controlling actuator 11 controls an approach speed of one material to be welded, for instance, the material to be welded 1. |
