| 摘要 |
PURPOSE:To increase weld penetration in a groove wall surface of a material to be welded securely by detecting when a rotating arc is positioned on the groove wall surface, and increasing an arc current for a specific time in response to its detection signal and thus performing welding. CONSTITUTION:At the groove 4 between materials 3 and 3' to be welded, welding is carried out as shown by an arrow (a) by the rotating arc 9 which is in circular motion shown by an arrow 5. At this time, a peak current Ip having a pulse waveform is generated at the position R where the rotating arc 9 is closest to the wall surface 3a of the material 3 to be welded and at the position L where the rotating arc 9 is closest to the wall surface 3' of the material 3' to be welded, thus increasing weld penetration at the positions R and L by the peak current Ip. |
