Importance

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Abstract

It is an object of the present invention to provide, in the double wire type welding method, a consumable electrode type arc welding method and welding apparatus for which the welding speed is sufficiently increased, and in particular the melting of steel such as carbon steel is increased and hence the welding speed is increased. With the present invention, a consumable electrode wire 1 is taken as the leading wire in the direction in which welding proceeds and a filler wire 2 is taken as the trailing wire, the consumable electrode wire 1 and the filler wire 2 are arranged approximately in parallel, and earthing is carried out from a welding power source 5, via a power feeding terminal 4a, from the consumable electrode wire 1, though an arc 12 and a molten pool 8, and from a parent material 3 by a parent material side earth wire 7; by placing an electrical resistor here, the current Ib flowing into the earth terminal of the welding power source 5 via the parent material 3 can be limited by the electrical resistor 20, and the ratio of the current If that is split off into the filler wire 2 to the welding current Iw can be raised; due to the increase in the split-off current, the amount of heat generation in the filler wire 2 increases, and thus even if the feeding rate of the filler wire 2 is increased there will not be a lack of Joule heat, and hence melt mixing of the filler wire 2 into the molten pool 8 can be carried out completely.

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First Claim