Abstract: A method of friction welding a workpiece and a component part is disclosed. The workpiece has a weld surface that is coextensive with at least a portion of a virtual surface, which is symmetric about an axis, and the component part includes a complementary surface that conforms to the weld surface. The method includes angularly oscillating the workpiece about the axis; urging the weld surface and the complementary surface together with a first predetermined force to create a plasticized region between the workpiece and the component part; urging the weld surface and the complementary surface together with a second predetermined force; discontinuing angularly oscillating the workpiece; urging the weld surface and the complementary surface together with a third predetermined force; and discontinuing to urge the weld surface and the complementary surface together when the workpiece and the component part coalesce.