| 摘要 |
PROBLEM TO BE SOLVED: To provide an improved friction stir welding tool for use in a friction stir welding method. SOLUTION: The friction stir welding tool includes a support body 32 rotatable around the axis and having a distal end defining a shoulder, a rotatable pin 36 extending from the distal end of the support body downward and away from the shoulder, and a bottom support member 54 connected to the distal end of the pin such that the rotatable pin is disposed between the support body and the bottom support member. The bottom support member contains a bottom shoulder 56 rotatable around the axis and facing the shoulder 40 of the support body. One of the bottom shoulder of the bottom support member and the shoulder of the support body is tapered and includes a face where at least one groove 60 is formed. COPYRIGHT: (C)2008,JPO&INPIT
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