Hitachi, Ltd.

Izumi Sakurai

Yoshitaka Kojima

Jin Onuki

Takao Funamoto

Masayasu Nihei

Akira Onuma

Takashi Haramaki

Multi-core conductive wire and a method of manufacturing the same

In a method for high frequency pulse welding and an apparatus therefor, a highly directive arc can be obtained by eliminating the effect of the inductance of the welding cable, which tends to make the high frequency electromagnetic pinch force large. In a method and an apparatus for high frequency pulse arc welding which is performed by generating an arc between an inconsumable electrode or a consumable electrode arranged near a portion of a base metal to be welded and the base metal with main pulse current, when the main pulse current is shifted from ON to OFF, a reverse pulse current having a polarity opposite to the polarity of the main pulse is supplied between the electrode and the base metal to improve the stiffness (directivity) of the arc by making the rising and falling edges of the pulses steeper. A rail-car and a nuclear power plant obtained by the method are also provided.

Method of high frequency pulse arc welding and apparatus therefor

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Hitachi, Japan

Izumi Sakurai