| 摘要 |
When an insertion force of a rotary tool (340) has searched, it is made clearly that the force at the insertion initial time is large and when a friction stir joining is an ordinary operation time, the force becomes small. According, it is preferable to make small the insertion force at the insertion initial time. To members (20,30) to be subjected to a joining at a position where the friction stir joining starts a hole (SO) is opened, and this hole SO after the rotary tool (340) has inserted, since a move of the rotary tool (340) is made to begin, a lowering of the insertion force can be attained. <IMAGE> |
