| 摘要 |
PURPOSE:To prevent the generation of a welding defect, and to improve the efficiency of a welding work by pushing up a molten metal in a molten pool by allowing mag netic force having specific directivity to work on a welding current flowing in the molten pool, and also, preventing the molten metal from sagging, by a copper patch. CONSTITUTION:Welding is executed by placing opposingly a surface side copper patch 11a provided with a water-cooling means and an exciting coil 13, and a reverse side copper patch 11b provided with a cooling means, through a base metal steel plate to be welded 1, feeding a welding wire 4, and connecting a feeding chip 18 and the steel plate 1 to a welding power source 20. The coil 13 is connected to an exciting power source 19 connected to the power source 20, an exciting current is given from an in on core 14 to which the coil 13 is wound and installed, and the power source 19, and by Lorentz's force, thereby, a weld metal 5 and an arc 23 are raised in the upper direction, and also, stirred by a vibration. In this case, to the coil 13, a DC current is applied in the direction where electromagnetic force which crosses a welding current flowing in a molten pool, and also, is in the direction for pushing up the molten metal 5 is generated. Or an AC current which crosses the welding current, and also becomes larger than the time for pushing up the molten metal 5, or the time when the force is reverse, or than the force is applied.
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