Importance

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Abstract

The object of the invention is to provide a rotary tool for friction stir welding having an excellent abrasion resistance and durability, which can attain an excellent joint characteristics. In a rotary tool 10 for friction stir welding, a shoulder portion 11 has an end surface 13 from which a prove pin 20 protrudes. The outer periphery of the prove pin 20 has a connection 15 linked to the end surface 13 of the shoulder portion 11. Pulse laser peening is applied to a base side region 22, that extends from the connection 15 to the screw part 23a. The prove pin, which is repetitiously exposed to compression load and tensile load during the friction stir welding, can maintain the surface rigidity and the toughness. The durability of the prove pin is greatly improved with the damages due to buckling or thermal deformation being restricted.

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First Claim