| 摘要 |
PURPOSE:To execute welding by the same number of layers, to shorten the welding time, and to improve the productivity by executing the overlayer welding of an inside surface side by a welding method utilizing outside surface welding. CONSTITUTION:According to a welding method utilized for the outside surface welding of a penstock and overlayer welding of the inside surface, a rocking width at every half period of a welding electrode 3 detected by an X axis direction displacement gauge 12 is sent to a computing element 13. It is calculated together with a desired bead height 14, wire feeding speed 15, a groove angle 16, an X axis direction distance 17 of the tip of the electrode 3 in the rocking end part and the groove wall surface, etc., which are inputted to the inside of the computing element 13. Subsequently, the welding speed is calculated, this welding speed 18 is sent to the motor 6 of a running carriage 5, and the speed of the running carriage 5, namely, the welding speed is controlled. In such a way, automatic welding can be executed, and the productivity is improved.
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