| 摘要 |
PURPOSE:To heat both end faces efficiently and to make the pressure welding highly speedy by passing a comparatively lower DC current between the steel plates which are abutted at intervals and by generating the arc to move in the width direction of the steel plate by applying an alternating magnetic field in the thickness direction as well. CONSTITUTION:A steel plate 1 is abutted at intervals and pinched the upper and lower by a clamp device 2. An arc is generated locally by passing a comparatively low current to the steel plate 1 from DC power source 6. The arc is then moved in the width direction with the action of the electromagnetic force in the width direction on the arc when an alternating magnetic field 10 is generated in the gap between the steel plates 1 by passing the alternating current to an exciting coil 8 from an alternating exciting power source 9. The both end faces 12 of the steel plate 1 can be uniformly heated accordingly. Thereafter the pressure welding is performed by a pressure device 3. The pressure welding of the steel plate having larger sectional area at high speed with comparatively low current is thus enabled.
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