| 摘要 |
Provided is a method for joining materials which is free from projections accompanying a design restriction as well as loosening and dropout, which enables joining of materials widely ranging from thinner sheets to thicker plates while preventing quality defects such as cracks and deformation from occurring and which can conduct joining with excellent recyclability while maintaining excellent workability and excellent working environment. Materials 1 and 2 are overlapped together so as to align their joint holes. A joint tool 8 is rotated and pushed on a joint auxiliary material 3 fitted into the joint holes, the joint tool 8 being immersed into the auxiliary material 3 softened in solid phase by the frictional heat generated. As a result, the auxiliary material 3 is tightly fitted into the joint holes and is caused to provide mechanical engaging parts (a ridge 5' and flanges 6' and 6'') with respect to the respective materials 1 and 2, the respective materials 1 and 2 being joined together through the auxiliary material 3.
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