Nippon Steel Corporation

Masashi Ichikawa

Yasuo Takahashi

Tohru Saito

Tadayuki Otani

Takeshi Nishi

Kunihiro Hayashida

Toru Saito

A method and apparatus for resistance welding in which, while both or one of the electrode center axes of a pair of opposing electrodes is inclined with respect to the electrode forcing axis, the electrode tip of the electrode is intermittently pivoted about the electrode center axis for welding. The contact between the electrode tip and workpiece is moved at a preset number of welds to define a next contact surface on the face of the electrode tip, and thus the number of welds (electrode tip life) is considerably improved.

Method and apparatus for resistance welding wherein the electrode axis

A container having an EOE with a tab affixed by welding is provided. In the EOE the top wall is made of surface treated steel sheet and the tab is made of stainless steel sheet or tin free steel sheet and the ultrasonic welding is used to fix the tab to the top wall. Through the invention monometallized containers can be supplied easily and cheaply.

Container having an easy opening end with a tab affixed by ultrasonic

A joint is made between two pieces of steel which have been preheated to a temperature To (.degree.C.) near their abutting surfaces by subjecting first to flashing and then to upsetting. When the ultimate flashing rate is V (mm/sec.), a current whose density I (A/mm.sup.2) is not lower than ##EQU1## is passed during the upsetting process to melt the abutting surfaces. With a mean upsetting rate of not lower than 50 mm/sec., only the molten metal is rapidly squeezed out from the abutting surfaces. Then, the upset current is cut off while applying a final upsetting force that is as low as under 5 kg/mm.sup.2.

Growing community of inventors

Sagamihara, Japan

Masashi Ichikawa