Patents by Inventor Yasuhiro Butsusaki

Yasuhiro Butsusaki has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • AC TIG welding apparatus using hot wire
    Patent number: 4904843
    Abstract: An unconsumable electrode such as tungsten is opposingly arranged with a base metal to be welded. An AC arc welding power supply is connected between the base metal and the unconsumable electrode. A filler wire such as of aluminum is fed by a wire feeder toward an arc-generated part between the base metal and the unconsumable electrode. Also included is a wire-heating power supply for producing a pulsed current. The wire heating power supply heats the filler wire by supplying thereto a pulsed current in accordance with a sync signal from the AC arc welding power supply or a detection signal of an arc current i.sub.A or an arc voltage of the AC arc power supply. The filler wire is thus heated by being supplied with a heating current i.sub.W in pulse form while the unconsumable electrode is kept negative by an AC arc formed between the unconsumable electrode and the base metal.
    Type: Grant
    Filed: November 16, 1988
    Date of Patent: February 27, 1990
    Assignee: Babcock-Hitachi Kabushiki Kaisha
    Inventors: Katsuyoshi Hori, Yasuhiro Butsusaki, Toshiaki Takuwa, Yoshiaki Matsumura