| 摘要 |
PURPOSE:To maintain the projecting length of wires always adequately and to perform satisfactory butt welding of thick walled pipes automatically by moving two electrode holding parts upward and downward mutually independently by the signal from a detector. CONSTITUTION:When a succeeding electrode W approaches to a preceding start position, a detector 21 goes on and emits an operation signal to a motor 29 so that an auxiliary slider 30 moves upward by the rate A of deposition for 1 pass of a preceding electrode W'. When a pipe P makes one turn and the electrode W' approaches to a succeeding start position B, a detector 21' goes on, and a signal is emitted to a motor 9 so that a main slider 10 moves upward by the rate of deposition for one pass by the electrode W. The electrode W' moves upward by the rate A in the position B and the electrode W descends by the rate A. When the electrode W' arrives at the preceding start position and the succeeding electrode W arrives at the succeeding start position B, the electrodes ascend respectively simultaneously by the rate A. In such a way the pipe P is subjected to butt and tandem welding. |
