Friction-welded shaft-disc assembly and method for the manufacture thereof

Method for producing a composite shaft/disc workpiece

• consisting of a metallic shaft of circular cross section, an outer wall of which is provided, in a connection region located in a defined axial position, with a plurality of steps, a diameter of which becomes larger in a direction of an axis,
• and of an essentially rotationally symmetrical disc with a passage hole in a region of an axis of rotation,
• the disc being fastened to the shaft by friction welding,
• wherein the disc is provided, in the region of the passage hole, with a plurality of rotationally symmetrical webs, an inside diameter of which fall short by a welding overlap of an outside diameter of the steps located opposite them in the connection region on the shaft,
• comprising the step of welding, at the same time as a deformation of the webs and of the steps located opposite them, to fasten the disc to the shaft in the defined axial position.

A method for producing a composite shaft/disc workpiece wherein the shaft includes a plurality of steps and wherein the disc includes a plurality of webs, comprising the steps of:

• disposing the disc on the shaft;
• mating the plurality of steps with the plurality of webs;
• and
• forming a cavity by the mating of the plurality of steps with the plurality of webs on an outer circumference of the shaft.