| 摘要 |
PROBLEM TO BE SOLVED: To provide a friction stirring and joining method in which any load generated during the friction stirring and joining operation can be reduced, any distortion of a joined member can be reduced, and the strength as a structure can be improved. SOLUTION: An air-cooling mechanism 20 is disposed behind the moving direction 16 of a rotary tool 10 to perform the friction stirring and joining of two hollow members 1 and 2. The air-cooling mechanism 20 is operated in the moving direction 16 at the same speed as the rotary tool 10 simultaneously when the rotary tool 10 is operated in the moving direction 16. The air- cooling mechanism 20 cools the outside air 21, and blows the cooled air 22 against a heat-affected zone 9 slightly behind the moving direction 16 of the rotary tool 10. Since the temperature difference between a front part and a rear part of the rotary tool 10 is reduced, the differential pressure is reduced, and the force in the longitudinal direction during the joining operation is also reduced. In addition, the heat input to the hollow members 1 and 2 is reduced, the distortion of the joined hollow members 1 and 2 is reduced, and the strength as a structure is also improved.
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