| 摘要 |
PURPOSE:To compensate automatically the nonuniformity in bead height during welding in a method for inverting the oscillation of an arc every time when a torch attains a reference height while controlling an arc length constant by controlling a welding condition in such a way that the deviation position in the height of the torch is made constant in the half period of each oscillation. CONSTITUTION:An oscillation is inverted every time when the height of a torch 3 attains the reference height (h) determined on the basis of the surface of base metal 1 while an arc length is controlled constant so as to maintain the specified space betwee the torch 3 and the groove faces of the metal 1. The height of the torch in the groove position here displaces to large and small H1 and H2 with respect to standard H0. A detector 21 which detects such displacement at every half period of the oscillation is inputted with the deviation from a comparator 16 and detects the amt. corresponding to H0-H0 by detecting the max. value of the deviation near the position where the oscillation is inverted or the change width of the oscillation, or the like. Said amt. is compared with H0 in a memory 23 and the welding condition, for example, the feed speed of a wire 4, in the next half period of the oscillation is controlled according to the deviation. |
