JPS5564984A - Foil seam welding device - Google Patents

Abstract

PURPOSE: To smoothly perform foil seam welding of thick plate materials by providing more than a pair of rotary auxiliary electrodes before the welding advance direction of a pair of rotary main electrodes which sandwich the base metals by way of foils and stepwise elevating the temperature in the base metal while suppressing the temperature rise of the foils.

CONSTITUTION: A pair of rotary auxiliary electrodes 9 which disposed two base metals 1 of plates by way of foils 2 similar to a pair of rotary electrodes 8 which sandwich the butt portions of said base metals 1 by way of the foils 2 are disposed slightly before the welding advance direction of said electrodes 8. Even at the welding of the plates by this device, current may be supplied at the permissible current value or less. While the base metals 1 and foils 2 are passing the electrodes 9, the foils 2 are cooled by the contact with the electrodes 9 whereby their temperature rise is suppressed and with the foils being held kept at a low temperature state only the central part of the base metals 1 is made to a high temperature state. Further while the base metals 1 and foils 2 are passing the electrodes 8, the foils 2 hardly cause temperature rise as compared to that while they are passing the electrodes 9 but the base metals 1 are difficult to receive cooling action from the electrodes 8 and therefore they rise further to a higher temperature state, to the melting point or more of steel, owing to supply current I', in which state welding may be accomplished.

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