Hitachi, Ltd.

Tsuyoshi Mizusaki

Masakuni Ezumi

Kazushige Fukuyori

On a main shaft of a numeric control type machine tool, a rotary tool is installed. The main shaft is not inclined in the machine tool. A first member and a second member to be subjected to friction stir welding are fixed on a table . Relative to an axial center of the rotary tool , a non-linear welding portion of the first member and the second member is inclined by inclining the table . Then, by rotating the table and relatively moving the portion to be welded into contact with the rotary tool , welding of the first member to the second member is carried out according to friction stir welding. The above-stated inclination is the inclination required for the friction stir welding. In this way, welding along a path of ring shape or circular shape (including a circular arc) using friction stir welding can be carried out easily.

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Kudamatsu, Japan

Tsuyoshi Mizusaki