Repair of gas turbine blade tip without recoating the repaired blade tip
AssigneeGeneral Electric Company
InventorsMark Daniel Gorman, Warren Davis Grossklaus
Life of this patent
Estimating the term…
Abstract
A damaged gas turbine blade which has previously been in service, and which is made of a base metal, is furnished. Any damaged material is removed from the damaged blade tip. The damaged blade tip is weld repaired with a nickel-base superalloy that is more resistant to oxidation resistance than is the base metal in the operating environment of the tip-repaired gas turbine blade. The method does not include any step of coating a lateral surface of the repaired blade tip with a non-ceramic coating after the step of weld repairing.
Claims15
A method for repairing a damaged gas turbine blade, comprising the steps of
- furnishing the damaged gas turbine blade which has previously been in service and which is made of a base metal;
- removing any damaged material from a damaged blade tip of the damaged gas turbine blade;
- and
- weld repairing the damaged blade tip with a nickel-base superalloy repair alloy that is more resistant to oxidation than is the base metal in the operating environment of the gas turbine blade to form a tip-repaired gas turbine blade having a repaired blade tip, wherein the repair alloy has a composition different from the base metal, and wherein the method does not include any step of coating a lateral surface of the repaired blade tip with a non-ceramic coating after the step of weld repairing.
A method for repairing a damaged gas turbine blade, comprising the steps of
- furnishing the damaged gas turbine blade made of a base metal and which has previously been in service;
- removing any damaged material from a damaged blade tip of the damaged gas turbine blade;
- and
- weld repairing the damaged blade tip with a repair alloy having a nominal composition, in weight percent, of from about 7.4 to about 7.8 percent chromium, from about 5.3 to about 5.6 percent tantalum, from about 2.9 to about 3.3 percent cobalt, from about 7.6 to about 8.0 percent aluminum, from about 0.12 to about 0.18 percent hafnium, from about 0.5 to about 0.6 percent silicon, from about 3.7 to about 4.0 percent tungsten, from about 1.5 to about 1.8 percent rhenium, from about 0.01 to about 0.03 percent carbon, from about 0.01 to about 0.02 percent boron, balance nickel to form a tip-repaired gas turbine blade having a repaired blade tip, wherein the repair alloy has a composition different from the base metal, and wherein the method does not include any step of coating a lateral surface of the repaired blade tip with a non-ceramic coating after the step of weld repairing.
A gas turbine blade comprising:
- a body including
- an airfoil made of a base metal, and
- a repaired blade tip of the airfoil made of a nickel-base-superalloy repair alloy of a different composition than the base metal, wherein the repaired blade tip is more resistant to oxidation than is the base metal in the operating environment of the gas turbine blade, and wherein there is no non-ceramic coating on a lateral surface of the repaired blade tip.
Dependencies are inferred from the claim text.