| 摘要 |
A plate 20 is stacked on a plate 10, the stacked surface of the plate 10 being provided with a groove 12. The outer portion of the plate 20 is equipped with a raised portion 22. A rotary tool 50 is inserted into the raised portion 22 for performing a friction stir welding. The groove 12 is filled up during the friction stir welding with the metal material constituting said raised portion 22. According to the present method, the pressure of the welding portion will not be excessive, and therefore the generation of a notch in the stacked surface is prevented. This provides a friction stir welding method which produces a lightweight joint having good characteristics.
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