Abstract: A composite shaft/disc workpiece which is assembled from a disc with a passage hole and from a shaft by friction welding is disclosed. The outer wall of the shaft has a plurality of steps in the connection region with the disc, the radius of the steps becoming larger in a direction of the axis. The passage hole of the disc is provided with webs, the radius of which likewise becomes larger in a direction of the axis and between which annular recesses are present. The webs and steps to be connected overlap in the radial direction, so that, during the welding of the shaft and disc, annular connecting portions are obtained in the region of the webs and steps, annular cavities being formed between the connecting portions. The cavities represent a weight saving, as compared with composite shaft/disc workpices made of solid material, and can also be used as parts of media ducts.

Abstract: In order to provide a C-shaped clamp for clamping workpieces, comprising a C-shaped clamp bow, a spindle nut arranged at one end of the clamp bow, a clamping spindle mounted in the spindle nut and a support arranged at the other end of the clamp bow, which can be used in conjunction with auxiliary elements for clamping a workpiece, it is proposed that the clamp bow have a guide section with guide surfaces for guiding infinitely adjustable, auxiliary elements for the C-shaped clamp.