Patent ID: 7441690
Filing Date: 2008-10-28
Classification: B23K,Y10T

Abstract:
1. A friction welding method for members of different metals, the method comprising: a friction welding step for contacting the members of different metals and relatively rotating the members while providing a friction pressure at a frictional interface of the members, the members consisting of a first member having a first melting point and a first proof stress, and a second member having a second melting point and a second proof stress, the first melting point being lower than the second melting point; and an upset step for upsetting the members at an upset pressure larger than the friction pressure; wherein the friction pressure is set to be not more than the first proof stress of the first member at the frictional interface temperature, and the upset pressure is set to be not less than the first proof stress of the first member at a normal temperatures, wherein a flange extending from the first member to the second member is formed by the friction welding.