| 摘要 |
PURPOSE:To improve the joining strength of materials by forming the inside diameter of Al material smaller than the outside diameter of steel and fixing the Al material and then, rotating the steel and pressurizing and inserting it into the Al material and again, pressurizing it after the rotation is stopped. CONSTITUTION:The inside diameter of the Al material 2 made of an Al cast alloy or an Al die-cast alloy is formed smaller than the outside diameter of a steel pipe 1 by about 0.5mm and clamped on a fixed part 3a. On the other hand, the Al material 2 is softened and the steel pipe 1 is inserted thereinto by applying the initial pressure P1 to the pipe 1 while rotating it on the rotational fixed part 3a. Next, after the rotation of the steel pipe 1 is stopped, the steel pipe 1 is pressed in the Al material 2 by the still larger pressure P2 than the pressure P1. Since the joining utilizing the generation of heat by friction is performed, the joining strength is improved. Furthermore, since the influence of an oxide film is prevented, a fragile intermetallic compound is prevented from being formed and further, the joining strength is improved.
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