| 摘要 |
A pin formed at front end of a rotary tool 10 made of a metal in a rod shape is inserted between an edge of a metallic member 1 and an edge of a metallic member 1', which inserted pin is moved along the longitudinal direction of the edges while rotating the pin, thereby generating friction heat between each of the metallic members 1 and 1 ' and the rotary tool 10 to weld the metallic member 1 with the metallic member 1' together. The rotary tool 10 is structured by a wide shoulder 12 and a thin pin 11 formed at the front end of the shoulder 12 and being inserted between the edges of the metallic members. Here, the pin 11 is in a right-cylindrical shape, being formed into smooth curved surface on the side thereof, and having no thread groove thereon.
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