Method for improving the sealing on rotor arrangements

An arrangement for fastening a plurality of blades on a rotor, comprising:

• the rotor including a plurality of generally axially extending profiled first recesses into which a ring of blades, which have corresponding blade root profiles, can be inserted in a form-fitting and/or frictionally locking manner into these first recesses in a generally axial insertion direction, wherein between the first recesses the rotor has circumferential surface sections which extend in the axial direction and circumferential direction and are covered by lower shrouds of circumferentially adjacently arranged blades in a radial direction;
• a plurality of blades, each blade including a blade root and a blade airfoil which is formed thereupon, wherein the blade root has a blade root profile and a lower shroud, and on an underside of the shroud there is a second recess which is open in an insertion direction towards the rotor;
• the circumferential surface sections are provided with stop elements in the radial direction wherein the stop elements have a rectangular or square cross section in axial section, the second recesses of adjacent first and second blades of the plurality of blades abut the stop elements along an entire circumferential length of the stop elements and the stop elements are fully accommodated in the second recesses, wherein the stop elements and the corresponding second recesses are configured in a stepped shape forming a labyrinth seal, wherein the labyrinth seal is configured to allow an amount of cooling air to flow to the stepped shape, wherein cooling air passages lead outwards from the surface sections in the radial direction for feeding cooling air which is blown out along the stepped shape between the stop elements and the second recesses,
• wherein the stop elements comprise ring sections connected to the circumferential surface sections by welding or soldering.