| 摘要 |
PROBLEM TO BE SOLVED: To reduce the deformation or degradation of a base metal, and to provide the high welding strength by installing a welding material on a bottom of a hole part, and press-fitting a friction rod into the hole part while rotating the friction rod smaller in diameter than the hole part. SOLUTION: A strap 5 is placed on a lower surface side of a base metal 3 so as to cover an opening end of a hole part 3a. A columnar welding material 4 whose outside diameter is smaller than the inside diameter of the hole part 3a is placed in the hole part, and placed on a bottom of the hole part 3a. A friction rod 1 is rotated by a driving means 2, and press-fitted into the bole part 3a at the same time. The instantaneously large friction heat is generated between the friction rod 1 and the welding material 4, or between the welding material 4 and the strap 5 by bringing a tip surface 1a of the friction rod 1 into contact with the welding material 4. The welding material 4 and the base metal 3 are heated by the friction heat to the temperature which is lower than the melting point of the base metal 3 and sufficient to realize the plastic flow. The plasticized welding material 4 implements the plastic flow by the friction rod 1, and fills a gap between the friction rod 1 and the base metal 3, and the inner side of the hole part 3a is cladded by welding.
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