| 摘要 |
PROBLEM TO BE SOLVED: To provide a friction welding method for ductile cast iron, in which a friction welding portion of ductile cast iron maintains almost the same level of elongation of the original base material without heat treatment. SOLUTION: Metal powder 2 containing at least 30% of silicone is coated on one side or both sides of connecting surfaces of two pieces of materials having the same diameter in advance, and then, a friction welding is applied to two pieces of the materials. In the friction welding method, a coated volume of the metal powder 2 is at least one-tenth and over of the product that multiplies a connecting surface area by a friction upset distance F during the friction welding. Further, a concave portion 3 is provided on the connection surface 1 so that the metal powder 2 mixing a combining agent is filled in the concave portion 3, in which the surface of the filled metal powder is the same level with the connecting surface 1. Furthermore, the deepest distance H sinking from the connecting surface 1 in the concave portion 3 does not exceed the friction upset distance F during friction welding.
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