Methods for joining a monocrystalline part to a polycrystalline part by means of an adapter piece made of polycrystalline material

摘要

The present invention relates to methods for joining a rotationally asymmetrical part, preferably a turbine blade, which is made of a monocrystalline material, to a part, preferably a rotor core, which is made of polycrystalline material, having the method steps of: —joining the rotationally asymmetrical part to an adapter piece made of polycrystalline material by means of rotational friction welding, and —joining the adapter piece to the part made of polycrystalline material. The present invention also relates to a turbine blisk having a rotor core made of polycrystalline material and turbine blades made of monocrystalline material.

主权项

1. A method for the individual joining of an individual rotationally asymmetrical turbine blade, which is made of a monocrystalline material, to a rotor core, which is made of a polycrystalline material, having the method steps of:
joining the rotationally asymmetrical turbine blade to a respective polycrystalline adapter piece made entirely of a polycrystalline material by rotational friction welding at a joint so that the polycrystalline material of the respective polycrystalline adapter piece is in direct contact with the monocrystalline material of the turbine blade, and wherein the respective adapter piece is cylindrical, and is rotationally symmetrical; wherein the rotationally asymmetrical turbine blade has a foot; and wherein the rotationally asymmetrical turbine blade is joined at its foot to the respective adapter piece, and the foot is pressed against a front surface of the respective adapter piece; whereby a planar welding zone is located at the joint between the foot of the turbine blade and the front surface of the respective adapter piece, and a welding bead forms in a ring around the planar welding zone; and joining the respective adapter piece to the rotor core made of polycrystalline material.