US 11,958,150 B2
Method for repairing a damaged leading or trailing edge region of a metallic turbine blade
Björn Anders, Berlin (DE); Reiner Anton, Berlin (DE); Constantin Garske, Birkenwerder (DE); Kay Krabiell, Hohen Neuendorf (DE); Heiko Lammers, Leipzig (DE); Ricardo Nilsson, Düsseldorf (DE); Daniel Vöhringer, Berlin (DE); and Jörg Ziege, Berlin (DE)
Assigned to Siemens Energy Global GmbH & Co. KG, Bayem (DE)
Appl. No. 18/025,901
Filed by Siemens Energy Global GmbH & Co. KG, Bayern (DE)
PCT Filed Aug. 6, 2021, PCT No. PCT/EP2021/072032
§ 371(c)(1), (2) Date Mar. 12, 2023,
PCT Pub. No. WO2022/063475, PCT Pub. Date Mar. 31, 2022.
Claims priority of application No. 10 2020 212 006.4 (DE), filed on Sep. 24, 2020.
Prior Publication US 2023/0347457 A1, Nov. 2, 2023
Int. Cl. B23P 6/00 (2006.01); B23K 1/00 (2006.01); B33Y 80/00 (2015.01); F01D 5/00 (2006.01); B23K 101/00 (2006.01)
CPC B23P 6/005 (2013.01) [B23K 1/0018 (2013.01); F01D 5/005 (2013.01); B23K 2101/001 (2018.08); B33Y 80/00 (2014.12); F05D 2230/80 (2013.01)] 9 Claims
OG exemplary drawing
 
1. 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.