| 摘要 |
PROBLEM TO BE SOLVED: To provide a stainless steel diffusive welding method capable of obtaining a welded part provided with the corrosion resistance and sufficient mechanical properties equivalent to those of the base material under the environment of wet carbon dioxide gas containing a very small amount of hydrogen sulfide. SOLUTION: In this diffusion welding method, a material to be welded of low melting point is interposed between end faces of butted works 12, and a welding part 3 is heated, and the compressive stress is applied in the longitudinal direction 5. The works 12 are made of stainless steel containing >=9wt.% Cr, the material to be welded of low melting point is made of Ni alloy of <=1150 deg.C in the melting point containing >=5wt.% Cr of 10-80μm in thickness, the compressive stress is 0.5-2kgf/mm<2> at butted end faces, and the heating is performed in a condition where the heating length 2 of >=800 deg.C is 3-20mm, and the works are kept for 120 seconds at the temperature of a welded layer 1 not less than the melting point of the material to be welded of low melting point, and not more than the melting point of the works.
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