PURPOSE: To improve the corrosion resistance and the joining strength of a different material joint by controlling a range of a junction part heated at a specific temperature to a prescribed distance or below from a joining interface.
CONSTITUTION: At the time of bringing a member 2 consisting of stainless steel, etc., to solid phase joining to a member 1 consisting of a Zr compound stock, etc., a range of a junction part heated at a temperature of ≥800°C is limited to a distance of ≤10mm from joining end faces 3, 4, respectively, and joining is executed. In this case, pressing force of the prescribed pressure range is allowed to work on vertical end faces 3, 4 of the members 1, 2, and by setting a transformation temperature of the member 1 as a boundary, heating is executed by a heat cycle by upper and lower suitable temperature width. Since ranges 7, 8 of a heating junction part are limited to ≤10mm, an expanse of heat affected zones 5, 6 of the junction part decreases. In such a way, since generated thickness of an intermetallic compound of the junction part decreases, the corrosion resistance and the joining strength of the junction part are improved.
NAKAGAWA HIROTAKA