Method for repairing a damaged leading or trailing edge region of a metallic turbine blade

A method for repairing a damaged leading or trailing edge region of a metallic turbine blade, which has a suction-side blade wall, a pressure-side blade wall and a leading edge and a trailing edge, comprising:

• a) removing the damaged leading or trailing edge region, forming a cutout;
• b) providing a replacement part which can be inserted by form fit into the cutout and which restores an intended geometry of the turbine blade;
• c) inserting the replacement part by form fit into the cutout in a predetermined insertion direction, and
• d) connecting the replacement part to the turbine blade by substance bonding,
• wherein in step a), recesses without undercut relative to the insertion direction are formed in the blade walls, wherein the recesses of the suction-side blade wall are positioned offset to the recesses of the pressure-side blade wall when the turbine blade is viewed from the side,
• wherein the replacement part provided in step b) has protrusions which in step c) are inserted by form fit in the recesses, wherein after insertion of the replacement part, the replacement part and the turbine blade have regions overlapping one another when the turbine blade is viewed from the side, and
• wherein in step c), after insertion in the cutout, the replacement part is fixed to the turbine blade using fixing elements extending through mutually overlapping regions, such that this mechanical fixing blocks removal of the replacement part from the cutout against the predetermined insertion direction.