| 摘要 |
PURPOSE:To shorten the time for joining and to improve the quality of welding by butting and restraining preceding and succeeding steel plates, supplying foil materials on the joint line thereof and subjecting both the steel plates to electrical resistance heating through the foil materials. CONSTITUTION:Press rollers 3a, 3b to press the front end of the succeeding steel plate 2 to the rear end of the preceding steel plate 1 are provided. Devices 4 for supplying the foil materials 5 are disposed on the joint line of the steel plates 1, 2. Rotary electrodes 6 are so provided that the electrodes can travel in the transverse direction while pressing the foil materials 5. After the steel plate 2 is pressed to the steel plate 1 by the rollers 3a, 3b, the foil materials 5 are supplied to the top and bottom surfaces of the joint line and are energized through the electrodes 6. The electrodes 6 are run in the transverse direction of the plates while the foil materials 5 are pressurized by said electrodes to join the steel plates 1, 2 in a short period. The welding quality is improved by the increase of current density and the prevention of the thermal diffusion to the electrodes.
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