Kabushiki Kaisha Yaskawa Denki

Other

Hitachi Via Mechanics, Lt

Tsuneo Shinada

Seigo Nishikawa

Koji Nomura

Yoshitaka Sakamoto

Seiichiro Fukushima

Tsuneo Mita

Hirotaka Adachi

Hideyasu Machii

Kazushige Ichikawa

Kanji Katada

Kiyoshi Naito

A consumable electrode type arc welding method for generating arc between a plate-shaped work and a welding wire by a mixed shield gas including argon gas to weld the plate-shaped work, includes:

Arc welding method

An arc welder comprising: a rectifier circuitwhich rectifies an alternating currentto a direct current; an inverter circuit; a transformer; a second rectifier circuitwhich rectifies an output of the transformerto a direct current; and a first reactorwhich is connected to the second rectifier circuit. The arc welder further has a current circuitwhich is connected in parallel to the second rectifier circuitwith a reactance that is larger than the reactance of the first reactor

Arc welder

An EP output voltage to be outputted during a period of EP polarity is set so that a welding current becomes equal to or lower than a critical current level, and an EN output voltage to be outputted during a period of EN polarity is set at a level lower than the EP output voltage. This makes it possible to substantially equalize a wire melting rate in the period of EN polarity and that in the period of EP polarity with each other. Even at such a short arc length as causing frequent short circuiting, gas-shielded AC arc welding making use of a consumable wire can be still performed stably so that high wire melting rate, shallow penetration, convex weld reinforcement and the like, which are characteristic features of AC welding, can each be set selectively at a desired level or in a desired shape depending on the application.

Gas-shielded AC arc welding method and machine making use of consumable electrode

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Ebina, Japan

Tsuneo Shinada