DIFFUSION JOINTING METHOD

PURPOSE:To accelerate the early-stage fusion and isothermal solidification of an insert material and to obtain a stable, strong joint part, by supplying energy for increasing the kinetic energy of metal atoms other than heat energy in addition to the heat energy. CONSTITUTION:A pressurizing jig 4 fixed to a pressurizing shaft 2 is equipped with base materials 3 to be jointed and the insert material 5 is interposed between curved surfaces of those base materials 3. They are heated by a heating body 6 under vacuum. The base materials 3 to be jointed are oscillated continuously by an ultrasonic oscillator 7. Consequently, the materials are given the oscillatory energy, so the fusion of the insert material is accelerated and the fused material enters local parts and then solidifies. Therefore, the isothermal solidification is accelerated and a joining treatment is carried out after the temperature of the insert material is lowered below the fusion point, so that this method is effective for a member which requires joint strength.