| 主权项 |
1. A joined structure,
wherein the joined structure is formed by a friction joining method of connecting joining surfaces of a pair of metal parts to each other with the use of frictional heat generated at the joining surfaces of the pair of metal parts, comprising: a heating process heating at least one of the joining surfaces of the pair of metal parts; a contact process, after the completion of the heating process with the joining surfaces of the pair of metal parts being faced to each other, relatively moving one of the metal parts toward the other to bring the joining surfaces of the pair of metal parts into contact with each other; and a joining process, after the completion of the contact process with the joining surfaces of the pair of metal parts being faced to and in contact with each other, reciprocating one of the metal parts relative to the other in a direction parallel to the joining surfaces, and at the same time, relatively pressing one of the metal parts to the other until a movement of the pair of metal parts reaches a target movement, thereby softening with frictional heat the joining surfaces of the pair of metal parts and joining the joining surfaces together, wherein the heating process makes a temperature at any one of the joining surfaces of the metal parts at the start of the joining process equal to 20% or greater of a melting point of material of the metal part. |
