| 摘要 |
PROBLEM TO BE SOLVED: To obtain weldable parts in which joining between a green compact and a steel material part can be completed simultaneously with sintering/alloying of the green compact by a single process by providing a member made of sintered alloy and a member made of weldable steel material, where either of these members is provided with a hole or a recess and the other is provided with a shaft or a projection, and fitting the hole of the member having a hole or a recess and the shaft of the member having a shaft or a projection together to carry out joining. SOLUTION: When a member (inner member) composed of steel material and having a shaft or a projection and a member (outer member) composed of green compact and having a hole or a recess are fitted and sintered, a green compact having a composition where the amount of expansion in a high temperature region of >=800 deg.C becomes smaller than that of the steel material is used. Further, it is preferable that, when an outer member composed of steel material and an inner member composed of green compact are fitted and sintered, a green compact having a composition where the amount of expansion in a high temperature region of >=800 deg.C becomes larger than that of the steel material is used. As for a fit tolerance between the hole of an outer member and the shaft of an inner member, running fit of <=5μm clearance or close fit of <=60μm interference is preferred.
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