| 摘要 |
PROBLEM TO BE SOLVED: To provide a diffusion welding method capable of obtaining a joint excellent in performance such as creep strength, by using a Ni base alloy high in Al content as the material to be welded. SOLUTION: Welding faces of a Ni base alloy high in Al content are butted to each other through an insert material which contains, by weight, 1-18% Cr, 1-5% B, 0.01-5% Ce, 0-11% Zr, 0-22% Hf, 0-11% Nb and 0-22% Ta, a pressure of 0.1-2.0 kgf/mm2 is applied the butting direction under vacuum atmosphere of <=8×10 torr or inert gas atmosphere containing 0-5 vol.% H2, and the butting parts are held at the temp of the melting point or above of the insert material and the melting point or below of the material to be welded at least for 120 sec.
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