| 摘要 |
PURPOSE:To perform accurately automatic copying multi-layer welding in a groove with multi-layers having a weld layer composed of plural passes, by inverting a torch oscillating in the groove at a location of a prescribed oscillating width after it is inverted at one wall face. CONSTITUTION:When multi-layer welding is performed in a groove with a welding torch being advanced along a welding line and oscillated in the direction of the width of groove while the interval between the torch and groove is maintained constantly, beads (a) and (b) of the 1st and 2nd layers are formed by performing the welding while the copying of the torch in the direction of the welding line is performed by catching arc signals of both end parts R and L of the groove. In the 3rd bead (c), the torch is oscillated toward one end R of the groove, inverted after detecting a position at a prescribed height A1, oscillated by a preset width l1 toward the other end L of the beveling from the inverted position A1, and again inverted toward the R at a position B1. The bead (c) of the 3rd layer is formed by alternately inverting the torch at points A2, B2,... in the same way. |
