| 摘要 |
PURPOSE:To control automatically oscillation width and to prevent generation of a welding defect by detecting the groove width from a pattern of a change in the sum of the arc length and projecting length of a wire during welding owing to oscillation. CONSTITUTION:When welding is started, the timing at which an oscillation width is zero is detected and the average value Ia of the welding current, the effective value Ie of the welding current, the voltage V between a chip 4 and a material 8 to be welded and the feed speed V of the wire are sampled. The distance L from the top end of the chip 4 and a weld metal 7 is calculated. The data is then sampled and L is calculated. The average Lm of the total sum of sampling of L and the set value Ld of a setter 31 are compared and a motor 22 is driven to move a vertical moving device 21 until Lm=Ld is attained. |
