| 摘要 |
PROBLEM TO BE SOLVED: To provide a high bonding strength, restrain dispersion in a resistance value caused by biting of a plastically flowing substance, and precisely control the bonding depth of a diffusion bonding structure in which an attaching member having an opposing surface opposed at least in its outer peripheral part to an attaching surface of a member to be attached, and having a circular cross-sectional outer surface, is pressed against the member to be attached, in a condition of heating both members while a part connecting between the opposed end surface and the outer surface is at first made into contact with the attaching surface of the member to be attached. SOLUTION: Before bonding an attaching member 25 to a member 13 to be attached, a connecting part 29 is formed into a curved shape which is convex toward the member 13 to be attached, and an end surface and an outer surface have parts 27a, 28a which are to be bonded to the member 13 to be attached, and which are formed into a curved shape having a radius of diameter greater than that of the connecting part 29. An annular recess 32 is formed in the opposed end surface, radially inward of the part 27 to be bonded to the member 13 to be attached.
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