METHOD FOR JOINING PARTICLE DISPERSION ALLOY PIPE

摘要

PURPOSE:To obtain a joining part of a particle dispersion alloy excellent in high-temperature strength by interposing an intermediate layer containing a melting-point lowering element between an alloy pipe and a round bar and specifying the total of clearances with respect to the inside dia. of the alloy pipe. CONSTITUTION:The round bar 2 is inserted into the ferritic particle dispersion alloy pipe 1 and the intermediate layer 3 is interposed between the alloy pipe 1 and the round bar 2. When the clearances in the radial direction between the intermediate layer 3 and the inside of the alloy pipe 1, and between the intermediate layer 3 and the outside of the round bar 2 are denoted by C1 and C2 respectively, the total of the clearances (all clearances) is made to C1+C2. These are arranged so that the clearances C1+C2 are made to =5% of the inside dia. of the alloy pipe and then, heated and maintained at the temperature between the melting point of the intermediate layer 3 and 1200 deg. and the inside of the alloy pipe 1 is joined to the outside of the round bar 2. By this method, the joining part of the particle dispersion alloy excellent in the high-temperature strength can be obtained.