Ishikawajima-harima Heavy Industries Co., Ltd.

Ishikawajima-harima Jukogyo Kabushiki Kaisha

Akio Tejima

Minoru Yamada

Akira Yamaoka

Ichiro Ohta

Kouzi Ishiwata

Masayuki Watando

A TIG welding apparatus comprises; a twin electrode type welding torchhaving a first and a second welding electrodearranged approximately parallel and either side of an insulation plate of a predetermined thickness, and a main unitwhich supplies to the first welding electrodea first welding current varied at a first period F, and to the second welding electrodea second welding current varied at the first period F and at an opposite phase to the variation of the first welding current. The main unitsuperimposes a variation of a second period fm being shorter than the first period F, onto the first and second welding currents. As a result, the arc current is increased without increasing the welding current.

Tig welding apparatus and method

In a TIG welding process with controlled welding current pulses, DC current pulses with the frequency set at from tens to hundreds Hz (most preferably from 30 to 300 Hz) are fed to an electrode and current pulses are also fed to a filler wire so that an arc is caused to swing, whereby a large pool of molten metal can be maintained in a positive and stable manner due to the high arc pressure obtained when the welding current pulses at from tens to hundreds Hz is used.

All position TIG welding process

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Yokosuka, Japan

Akio Tejima