| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a rotary tool for friction stir welding which has excellent abrasion resistance and durability, and ensures excellent bonding characteristics. <P>SOLUTION: A probe pin 20 protrudes from an apical surface 13 of a shoulder portion 11 of the rotary tool 10 for friction stir welding, and pulse laser peening is performed in a base-end area 22 on the outer circumference surface of the probe pin, the area ranging between a connecting portion 15 connected to the apical surface 13 of the shoulder portion 11, and a screw portion 23a. The surface hardness and toughness of the probe pin 20 to which compressive loading and tensile loading are applied repeatedly accompanying friction stir welding, are maintained, and damage due to buckling and heat deformation is inhibited to drastically improve durability. <P>COPYRIGHT: (C)2011,JPO&INPIT</p> |
