Hitachi Seiko, Ltd.

Toyota Jidosha Kabushiki Kaisha

Tsuneo Mita

Tsuneo Shinada

Takayuki Kashima

Hitoshi Matsui

A pulsed arc welding apparatus includes a short circuit detecting circuit for detecting a time during which a short circuit is being produced by melting a consumable electrode across a consumable electrode and a base metal, a comparison circuit for comparing an integrated value or a mean value of short circuit generating time detected by the short circuit detecting circuit with an optional set value, and a control circuit for controlling either one of the supply time of the pulse current and the base current supply time in accordance with the result of comparison by this comparison circuit, thereby to control the arc length.

Pulsed arc welding method and apparatus

A consumable electrode gas shielded AC arc welding method and an apparatus to practice the method applies alternating current across a consumable electrode and a base metal. During a first period, the electrode is positive and a current of a first level higher than a specified critical level is furnished. During a second period, the electrode is kept positive and current is reduced to a second level lower than the first level. During a third period, the electrode is kept negative at a third current level. These periods are periodically repeated. If during the frist period, the arc voltage drops below a predetermined voltage, current of a fourth level higher than the first level is furnished until the arc voltage exceeds the predetermined level.

Consumable-electrode AC gas shield arc welding method and apparatus

In a consumable electrode gas shielded arc welding system, alternating current power is applied across the electrode and the base metal. The period during which the electrode is kept negative is varied to correspond to the electrode feeding rate. In addition, the levels of the output power during the negative and positive periods are individually set.

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Hiratsuka, Japan

Tsuneo Mita