Patent ID: 9000323
Filing Date: 2015-04-07
Classification: B23K,B23P,F16D,Y10T

Abstract:
1. A method for connecting metal parts, the method comprising: providing a hub composed of a metal and having an inner surface thereof with a first hub joining portion, a second hub joining portion and a transitional hub portion adjoining the first and second hub joining portions; providing a shaft composed of a metal and having a raised area at an outer circumferential surface thereof with a first shaft joining portion, a second shaft joining portion and a transitional shaft portion adjoining the first and second shaft joining portions, wherein the first shaft joining portion corresponds in shape to the first hub joining portion, the second shaft joining portion corresponds in shape to the second hub joining portion; pressing, while the second hub joining portion and the second shaft joining portion are not in contact with one another, and the shaft and the hub are joined together at a first contact point of the first hub joining portion and a second contact point of the first shaft joining portion; feeding a welding current via the first contact point and the second contact point that have been pressed together so that the first contact point and the second contact point fuse at the first hub joining portion and the first shaft joining portion; and then pressing the shaft into the hub by subjecting the shaft to a force in a press-fitting direction which is parallel to an axis extending coaxially between the shaft and the hub, until a press fit is formed at the second hub joining portion and the second shaft joining portion.