| 摘要 |
PROBLEM TO BE SOLVED: To prevent burn-in of a cutting edge when friction stir welding is conducted while removing excess metal (a tack welding part) by the cutting edge of a rotary tool. SOLUTION: An opening hole 21a for blowing off an inert gas toward a cutting edge 11 and in the vicinity thereof is provided in the cutting edge 11A of the cutting tool 11 or in the vicinity thereof. When the friction stir welding is conducted while removing excess metal S by the cutting edge 11A, the inert gas is blown off toward the cutting edge 11A and in the vicinity thereof, thereby the atmosphere of the inert gas is produced, and the excess metal is removed by the cutting edge 11A in the atmosphere. COPYRIGHT: (C)2003,JPO
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