Honda Giken Kogyo Kabushiki Kaisha

Hisaya Watanabe

Yukihiro Yaguchi

Nobuo Kobayashi

Toshiaki Nagasawa

Shigeo Kobayashi

Toshikazu Asakura

Akira Takeshima

Tomohiko Ito

Isao Bundou

Akihiko Takahashi

Yasuto Watanabe

Kouji Oda

Daisuke Kiriishi

Kensaku Kaneyasu

In a spot welding gun which is made up of a gun main body which is operated for equalization by a driving source, a stationary electrode tip which is immovable relative to the gun main body, and a movable electrode tip which is connected to a pressing source, both electrode tips are pressed to a workpiece with an even force, to thereby perform a high quality spot welding. The driving source is controlled such that the electrode force of the stationary electrode tip, by the driving source, to the workpiece becomes substantially zero. In this manner, there occurs no difference in the electrode forces by both the electrode tips to the workpiece.

Method of controlling electrode force of spot welding gun

A workpiece is welded successively at a plurality of welding points by a direct-current resistance welding machine with a constant current in a welding current supply period at each of the welding points, and the constant current is varied depending on whether expulsions are produced on the workpiece when it is welded, to determine an expulsion-producing limit current value as a maximum current beyond which expulsions will be produced. The workpiece is welded with a first stepped welding current having a first current value that is smaller than the expulsion-producing limit current value by a predetermined value and a second current value that is greater than the expulsion-producing limit current value, and an average current value higher than the expulsion-producing limit current value, and also with a second stepped welding current having a variation of the second current value based on whether expulsions are produced or not on the workpiece when it is welded with the first stepped welding current.

Method of controlling welding current in direct-current resistance

A nut runner control system includes a plurality of nut runners, a plurality of subcontrollers connected to the nut runners, respectively, for controlling the nut runners, and a master controller connected to the subcontrollers for presetting and modifying drive conditions for the nut runners and for monitoring the nut runners based on data indicating operating conditions of the nut runners and received through the subcontrollers, respectively.

Nut runner control system and method of monitoring nut runners

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Sayama, Japan

Hisaya Watanabe