| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a rotary tool for friction stirring capable of appropriately performing friction stir welding. <P>SOLUTION: The rotary tool B for friction stirring used for friction stirring the butted parts of a pair of metallic members 1, 1 comprises a shoulder part B1 composed of a metal harder than the metallic member 1, a stirring pin B2 projected at the center of a bottom end surface B11 of the shoulder part B1, and formed to a tapering circular truncated cone shape, and a stirring blade B3 spirally engraved on the outer peripheral surface of the stirring pin B2. The ratio of the length of the stirring pin B2 to the maximum external diameter Y<SB>2</SB>of the stirring pin B2 is 1.33 to 2.03. <P>COPYRIGHT: (C)2010,JPO&INPIT</p> |
