PURPOSE: To enable stable and uniform electroslag build-up welding with a beltlike electrode by feeding electricity uniformly to the broad beltlike electrode through power feed tips which are divided to a multiple number of three and are connected to an electric power source of three-phase AC for welding.
CONSTITUTION: The degree of melting of a beltlike electrode 1 to be supplied with feed rolls (not shown) and power feed tips 9 roughly perpendicularly over a base material 4 is regulated with the varying amplitude of electric current by using a constant voltage power source in horizontal electroslag build-up welding with the beltlike electrode wherein said electrode is melted by Joule heat in the molten slag 2 formed from a flux 6 sprayed on the material 4 to form a molten pool 5 and build-up beads 3 are formed successively in accordance with the progression of welding in an arrow direction. Terminals R, S, T of a three-phase AC electric power source are connected successively to power feed tips (r), (s), (t) 9 divided to three or the multiple thereof to deviate the peaks of the currents at the respective power feed tips by a 120° phase, whereby the supply of electricity to the electrode 1 is made uniform and stable molten slag 2 is formed.
TOKURA MOTOI
NAKADA YASUTOSHI
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