| 摘要 |
PROBLEM TO BE SOLVED: To provide such a method for joining different kinds of metal materials that attains superior joining strength under a low draft. SOLUTION: In joining two metal materials 1, 2 each with a different hardness, a large number of blind bite holes 3 are preliminarily formed on the joining surface of the hard metal material 2. The blind bite holes 3 are set to have the cross section larger than the opening part 3a at least in a part in the depth direction. With the joining surfaces of both members 1, 2 superposed and then rolled, the soft metal material 1 is deformed and bitten into the blind bite holes 3 fillingly. The biting holes 3 are desirably formed by the irradiation of an electron beam. |
