Daihen Corporation

Hayato Baba

Tetsuo Era

Hideo Shiozaki

Masahiro Inoue

Tomoyuki Ueyama

Yukiya Morita

Hisao Miyahara

Hirokazu Kawai

Songjie Hou

An arc welding method of a consumable electrode type generating arc between a tip end of welding wire and a to-be-welded portion by feeding welding wire to the to-be-welded portion of a base material while supplying welding current having average current of 300 A or larger to the welding wire, to weld the base material, includes: feeding the welding wire at a speed of the tip end being inserted into a space surrounded by a concave melted portion formed in the base material by the arc generated between the tip end and the to-be-welded portion; periodically alternating between a small current period where the welding current has a small average value and droplet is transferred from the tip end to a bottom part of the melted portion and a large current period where the welding current has a large average value and droplet is transferred from the tip end to a side part of the melted portion; and controlling the welding current in the large current period so that droplet transfer from the tip end to the side part is performed a plurality of times in each large current period.

Arc welding method and arc welding device

An arc welding system of a consumable electrode type comprises: a wire feeding device that feeds welding wire from a wire feeding source to a welding torch; and a power supply device that supplies electric power between the welding wire fed to the welding torch and a base material, the system being configured to weld the base material by arc generated by the supplied electric power. The wire feeding device is provided with: an intermediate wire feeding source that is disposed between the wire feeding source and the welding torch and is configured to temporarily accommodate the welding wire fed from the wire feeding source and to feed the accommodated welding wire to the welding torch; a pull-out feeding part that feeds the welding wire at the wire feeding source to the intermediate wire feeding source; and a push-out feeding part that feeds the welding wire accommodated in the intermediate wire feeding source to the welding torch.

Arc welding system and wire feeding device

The welding method comprises: a step of preparing a first base material and a second base material; a step of disposing the first base material and the second base material in a manner such that a first end face of the first base material and a second end face of the second base material face each other; and a step of welding the first base material and the second base material together using GMA welding so that the first end face and the second end face are joined together. In the step of welding the first base material and the second base material together, an arc is formed in a state where the welding wire penetrates into a region surrounded by a molten region, so that the molten region is formed to pierce through the first base material and the second base material in the thickness direction.

Welding method and arc welding device

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Osaka, Japan

Hayato Baba