| 摘要 |
A method of joining materials which eliminates the possibility of an extending projection, loosening and falling-off that will cause design obstruction, permits joining materials over a wide range from a thin sheet to a thick plate, can avoid quality defects such as cracking and deforming, and enables joining excellent in recycling performance with a satisfactory workability and working environment maintained. Materials (1, 2) are laid one upon another with respective joining holes coincident, a joining tool (8) is pressed while being turned against a joining auxiliary material (3) fitted into the joining holes, the joining auxiliary material (3) kept in a solid state is softened by frictional heat caused by the pressing to allow the joining tool (8) to be embedded and to thereby allow the joining auxiliary material (3) to be tightly fitted into the joining holes, and engaging portions (a protrusion (5') and flanges (6', 6'')) mechanically engaging with respective material (1, 2) are formed on the joining auxiliary material (3), whereby respective materials (1, 2) are joined to each other via the joining auxiliary material (3). |
