The invention relates to a workpiece (1), in particular a rotor disc, an impeller or guide wheel for a turbine, for a pump or for a compressor, including a base body (2) with a guide vane (3), wherein the guide vane (3) is welded in notch-free manner to the base body (2) and/or to a cover part (4). Furthermore, the invention relates to a welding method for the manufacture of a workpiece (1).