Metal fusion bonding – Process – Repairing – restoring – or renewing product for reuse
Reexamination Certificate
2002-06-10
2004-06-01
Stoner, Kiley (Department: 1745)
Metal fusion bonding
Process
Repairing, restoring, or renewing product for reuse
C228S171000, C228S246000, C029S889100
Reexamination Certificate
active
06742698
ABSTRACT:
BACKGROUND OF THE INVENTION
The present invention relates to a method for repairing a component, such as a turbine blade or a vane, used in a gas turbine engine.
Currently, gas turbine blade tips and trailing edge regions are repaired using a welding process such as gas tungsten arc welding without a backing material. The weld bead is used to build up cracked and worn surfaces. Problems occur when blade tip cracks expose blade internal cavities. In this case, the weld will flow into the cavity and result in a rejectable condition. In other areas, such as a blade trailing edge, weld repair will result in closure of the internal cooling features that will then need to be re-established by labor intensive blending or electrodischarge machining.
SUMMARY OF THE INVENTION
Accordingly, it is an object of the present invention to provide an improved method for repairing turbine engine components.
It is a further object of the present invention to provide a method as above which allows welding over open cavities and which does not require extensive post welding blend processing or machining.
It is yet another object of the present invention to provide a method as above which allows re-establishment of internal cooling geometry.
The foregoing objects are attained by the method of the present invention.
In accordance with the present invention, a method for repairing a component used in a turbine engine broadly comprises the steps of placing a piece of refractory metal material over an area of the component to be repaired and depositing a repair filler metal material over the piece of refractory metal material in an amount sufficient to repair the component and welding same. The refractory metal material may be any refractory material having a melting point in excess of 1455° C. (2651° F.) and may be coated or uncoated.
Other details of the repair method of the present invention, as well as other objects and advantages attendant thereto, are set forth in the following detailed description and the accompanying drawings wherein like reference numerals depict like elements.
REFERENCES:
patent: 4110887 (1978-09-01), Kachik
patent: 4705203 (1987-11-01), McComas et al.
patent: 4775602 (1988-10-01), Rasch
patent: 5175411 (1992-12-01), Barber
patent: 5666643 (1997-09-01), Chesnes et al.
patent: 5806751 (1998-09-01), Schaefer et al.
patent: 6193145 (2001-02-01), Fournier et al.
patent: 6283356 (2001-09-01), Messelling
patent: 6332272 (2001-12-01), Sinnott et al.
patent: 6413578 (2002-07-01), Stowell et al.
patent: 6470568 (2002-10-01), Fried et al.
patent: 2002/0100793 (2002-08-01), Fried
patent: 2003/0052110 (2003-03-01), Gandy et al.
patent: 2003/0118448 (2003-06-01), Lee et al.
patent: 405195717 (1993-08-01), None
Beals James T.
Pietruska Norman
Shah Dilip M.
Szela Edward R.
Bachman & LaPointe P.C.
Stoner Kiley
United Technologies Corporation
LandOfFree
Refractory metal backing material for weld repair does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Refractory metal backing material for weld repair, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Refractory metal backing material for weld repair will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3311311