Metal working – Method of mechanical manufacture – Impeller making
Patent
1997-07-14
1998-10-20
Cuda, Irene
Metal working
Method of mechanical manufacture
Impeller making
2988972, 2940213, 2940216, 164 98, B23P 1500, B22D 1910
Patent
active
058228527
ABSTRACT:
A method for repairing a blade tip of a turbine blade of a gas turbine engine. The method is particularly directed to replacing the squealer tip (14) of a directionally solidified (DS) or single crystal (SX) turbine blade (10), and can be carried out using a brazing or welding technique. The method generally entails the step of machining the tip (14) to remove any damaged, worn, oxidized or eroded portions thereof sustained by the blade (10) during engine operation. A DS or SX superalloy replacement tip (18) is then placed on the surface generated by the machining operation. If a brazing operation is used, a brazing alloy composition (16) is first applied to the blade tip or replacement tip (18) prior to placement of the replacement tip (18). The brazing alloy composition (16) is composed of at least two alloys, one of which having a melting point lower than the recrystallization temperature and solvus temperature of the superalloy of the turbine blade (10), such that heating causes the brazing alloy composition (16) to flow and thereby join the replacement tip (18) to the blade tip of the turbine blade (10). Alternatively, if a welding operation is employed, the joining operation entails transmitting current through the turbine blade (10) and replacement tip (18) to resistance weld the replacement tip (18) to the blade tip of the blade (10).
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Bewlay Bernard Patrick
Jackson Melvin Robert
Cuda Irene
General Electric Company
Johnson Noreen C.
Stoner Douglas E.
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