US20020194733A1 - Method for repairing cracks in a turbine blade root trailing edge - Google Patents
Method for repairing cracks in a turbine blade root trailing edge Download PDFInfo
- Publication number
- US20020194733A1 US20020194733A1 US09/887,448 US88744801A US2002194733A1 US 20020194733 A1 US20020194733 A1 US 20020194733A1 US 88744801 A US88744801 A US 88744801A US 2002194733 A1 US2002194733 A1 US 2002194733A1
- Authority
- US
- United States
- Prior art keywords
- trailing edge
- turbine blade
- edge portion
- thermal barrier
- crack
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D5/00—Blades; Blade-carrying members; Heating, heat-insulating, cooling or antivibration means on the blades or the members
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P6/00—Restoring or reconditioning objects
- B23P6/002—Repairing turbine components, e.g. moving or stationary blades, rotors
- B23P6/007—Repairing turbine components, e.g. moving or stationary blades, rotors using only additive methods, e.g. build-up welding
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P6/00—Restoring or reconditioning objects
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P6/00—Restoring or reconditioning objects
- B23P6/04—Repairing fractures or cracked metal parts or products, e.g. castings
- B23P6/045—Repairing fractures or cracked metal parts or products, e.g. castings of turbine components, e.g. moving or stationary blades, rotors, etc.
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D5/00—Blades; Blade-carrying members; Heating, heat-insulating, cooling or antivibration means on the blades or the members
- F01D5/005—Repairing methods or devices
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D5/00—Blades; Blade-carrying members; Heating, heat-insulating, cooling or antivibration means on the blades or the members
- F01D5/12—Blades
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T29/00—Metal working
- Y10T29/49—Method of mechanical manufacture
- Y10T29/49316—Impeller making
- Y10T29/49318—Repairing or disassembling
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T29/00—Metal working
- Y10T29/49—Method of mechanical manufacture
- Y10T29/49316—Impeller making
- Y10T29/49336—Blade making
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T29/00—Metal working
- Y10T29/49—Method of mechanical manufacture
- Y10T29/49718—Repairing
- Y10T29/49721—Repairing with disassembling
- Y10T29/49723—Repairing with disassembling including reconditioning of part
- Y10T29/49725—Repairing with disassembling including reconditioning of part by shaping
- Y10T29/49726—Removing material
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T29/00—Metal working
- Y10T29/49—Method of mechanical manufacture
- Y10T29/49718—Repairing
- Y10T29/49746—Repairing by applying fluent material, e.g., coating, casting
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T29/00—Metal working
- Y10T29/49—Method of mechanical manufacture
- Y10T29/49995—Shaping one-piece blank by removing material
- Y10T29/49996—Successive distinct removal operations
Definitions
- the present invention relates to a method for repairing cracks in a trailing edge portion of a turbine blade.
- Axial cracks initiating at the root trailing edge cooling hole occur on turbine blades used in industrial applications.
- the cracks are caused by thermal mechanical fatigue.
- the cracks initiate from both the concave and the convex side of the root trailing edge cooling hole and run axially towards the leading edge of the blade. Since the turbine blades are otherwise serviceable, a method for effectively repairing these cracks is needed.
- a method for repairing a turbine blade having a crack in a trailing edge portion of the turbine blade broadly comprises cutting back the trailing edge portion of the concave and convex surfaces adjoining the trailing edge portion to a depth greater than the length of the crack. Concurrent with the cut back procedure, the portion of the turbine blade between the platform and the cut back trailing edge portion is shaped using a compound radius to eliminate the presence of any cusp on the trailing edge. Further, those edges remaining after the cut back procedure are blended to a smooth radius to minimize stress concentration and aerodynamic losses. The cut back trailing edge portion is also faired into the original trailing edge profile, preferably at the approximate mid-span, to minimize aerodynamic impact.
- a thermal barrier coat is applied to the repaired turbine blade to increase its service life. Prior to the application of the thermal barrier coating, the tip length of the turbine blade is modified to account for reduced substrate temperature of the repaired turbine blade.
- FIG. 1 is a perspective view of a root portion of a turbine blade to be repaired
- FIG. 2 is a side view of the root trailing edge portion on the concave airfoil side of the turbine blade
- FIG. 3 is a side view of the root trailing edge portion on the convex airfoil side of the turbine blade
- FIG. 4 is a side vide of the root trailing edge portion of the turbine blade showing the compound radius curve used to blend the cut back trailing edge portion to the platform portion of the turbine blade;
- FIG. 5 is a side view of a turbine blade repaired in accordance with the present invention.
- FIG. 6 is a perspective view of the turbine blade of FIG. 5.
- FIG. 7 is a rear view of the turbine blade of FIG. 5.
- FIG. 1 shows a portion of a turbine blade 10 that requires repair.
- the trailing edge 12 of the turbine blade 10 is provided with a plurality of cooling holes 14 .
- one or more cracks 16 form in the vicinity of the lowermost one 14 ′ of the cooling holes 14 known as the root trailing edge cooling hole.
- the cracks initiate from both the concave side 18 and the convex side 20 of the airfoil portion 22 of the turbine blade 10 .
- Each crack 16 extends axially toward the leading edge 24 of the blade 10 . It has been found that the cracks 16 , that fall within acceptable serviceable limits, preferably that extend less than approximately about 0.05 inches and as determined for a given blade, may be repaired using the method of the present invention.
- a portion 26 of the trailing edge known as the root trailing edge portion is cut back on both the concave side 18 and the convex side 20 .
- This cut back is shown in FIGS. 2 and 3.
- the original trailing edge 12 is cut back by a distance or depth L to form a cut back trailing edge portion 28 .
- the distance or depth L is greater than the length of the crack 16 . This cut back removes material in the area where the crack 16 is located and reach fresh material where there are no cracks or microcracks.
- the distance or depth L is preferably less than the radius of the trailing edge 12 .
- the cutting back of the root trailing edge portion 26 may be carried out using any suitable means known in the art. Preferably, it is carried out by grinding or milling each of the concave side 18 and the convex side 20 .
- a compound radius having a major radius R 1 and a minor radius R 2 which compound radius preferably varies from approximately about 0.375 inches to approximately about 0.1875 inches, is used in the transition area between the cut back trailing edge 28 and the platform 30 .
- the concave and convex sides are cut back, they are not cut back along the entire span of the airfoil portion 22 of the turbine blade 10 .
- the top half 32 of the original trailing edge 12 is left alone. It is then necessary to fair the cut back trailing edge portion 28 into the original trailing edge profile to minimize aerodynamic impact.
- Any suitable technique known in the art which minimizes abrupt changes/discontinuities in the trailing edge geometry of the turbine blade 10 and which avoids adverse effects on the flow field, vibrations, and structural integrity may be used to fair the cut back trailing edge portion 28 into the original trailing edge profile.
- the cut back trailing edge portion 28 is faired into the original trailing edge profile at approximately about the 50% span.
- any remaining edges are blended, either by machine or by hand, to a smooth radius to minimize stress concentration and aerodynamic losses.
- the edges 34 , 36 , 38 , 40 , 42 , and/or 44 which typically require the blending are shown in FIG. 7.
- the edges 34 , 36 , 38 , 40 , 42 , and/or 44 are blended to a smooth radius of approximately about 0.005 to approximately about 0.015 inches.
- cooling holes 14 may be refurbished using any suitable technique known in the art.
- the thermal barrier coating may comprise any suitable thermal barrier coating known in the art and may be applied using any suitable means known in the art.
- the thermal barrier coating may be a MCrAlY coating where M is selected from the group consisting of iron, nickel, cobalt, and mixtures of nickel and cobalt such as that shown in U.S. Pat. No. 4,321,311, which is hereby incorporated by reference herein.
- the thermal barrier coating may be a MCrAlY type coating where M is nickel or cobalt and which is improved by the addition of from 0.1 to 7.0% by weight silicon and 0.1 to 2.0% by weight hafnium such as that shown in U.S. Pat. No. 4,585,481, which is hereby incorporated by reference herein.
- the thermal barrier coating could also be a thermally insulating ceramic coating having a pyrochlore structure such as that shown in U.S. Pat. No. 6,117,560, which is hereby incorporated by reference herein.
- the thermal barrier coating could also be a thermally insulating ceramic coating containing gadolinia and zirconia such as that shown in U.S. Pat. No. 6,177,200, which is hereby incorporated by reference herein.
- the thermal barrier coating may be applied to the turbine blade using any of the techniques shown in the aforementioned U.S. Patents.
- the tip portion 46 of the turbine blade 10 is preferably modified by applying a weld material to the tip portion 46 and machining the turbine blade 10 to a predetermined length. While the weld material to be applied to the tip portion 46 may comprise any suitable welding or brazing material known in the art, it is preferred to add a nickel based alloy weld material to the tip portion 46 . The added weld material helps avoid any negative clearance effects caused by the application of the thermally insulating ceramic coating.
- the turbine blade 10 With the thermally insulating ceramic coating, the turbine blade 10 will not thermally expand as originally designed. The turbine blade 10 will expand less, as it is cooler. This in turn creates a larger gap at the tip portion 46 in the radial direction, than is desirable from a leakage/sealing standpoint and from a performance standpoint. Thus, to accommodate the reduced tip growth, the tip portion 46 is built up with weld material and then machined to a desired predetermined length.
- thermal barrier coating to the repaired turbine blade 10 is that it reduces blade metal temperature gradients.
- the reduced thermal gradient combined with thicker trailing edge walls and increased fillet radius reduce airfoil root stresses and increases blade service life.
- the thermal mechanical fatigue life, of the repaired blade is increased by 2 times or more.
Abstract
Description
- The present invention relates to a method for repairing cracks in a trailing edge portion of a turbine blade.
- Axial cracks initiating at the root trailing edge cooling hole occur on turbine blades used in industrial applications. The cracks are caused by thermal mechanical fatigue. Typically, the cracks initiate from both the concave and the convex side of the root trailing edge cooling hole and run axially towards the leading edge of the blade. Since the turbine blades are otherwise serviceable, a method for effectively repairing these cracks is needed.
- Accordingly, it is an object of the present invention to provide a method for repairing cracks in a trailing edge portion of a turbine blade.
- It is a further object of the present invention to provide a repair method as above which has particular utility in the repair of cracks initiating at a root trailing edge cooling hole.
- It is yet a further object of the present invention to provide a method as above which increases the service life of the repaired turbine blade.
- The foregoing objects are attained by the method of the present invention.
- In accordance with the present invention, a method for repairing a turbine blade having a crack in a trailing edge portion of the turbine blade is provided. The method broadly comprises cutting back the trailing edge portion of the concave and convex surfaces adjoining the trailing edge portion to a depth greater than the length of the crack. Concurrent with the cut back procedure, the portion of the turbine blade between the platform and the cut back trailing edge portion is shaped using a compound radius to eliminate the presence of any cusp on the trailing edge. Further, those edges remaining after the cut back procedure are blended to a smooth radius to minimize stress concentration and aerodynamic losses. The cut back trailing edge portion is also faired into the original trailing edge profile, preferably at the approximate mid-span, to minimize aerodynamic impact.
- In accordance with the present invention, a thermal barrier coat is applied to the repaired turbine blade to increase its service life. Prior to the application of the thermal barrier coating, the tip length of the turbine blade is modified to account for reduced substrate temperature of the repaired turbine blade.
- 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.
- FIG. 1 is a perspective view of a root portion of a turbine blade to be repaired;
- FIG. 2 is a side view of the root trailing edge portion on the concave airfoil side of the turbine blade;
- FIG. 3 is a side view of the root trailing edge portion on the convex airfoil side of the turbine blade;
- FIG. 4 is a side vide of the root trailing edge portion of the turbine blade showing the compound radius curve used to blend the cut back trailing edge portion to the platform portion of the turbine blade;
- FIG. 5 is a side view of a turbine blade repaired in accordance with the present invention;
- FIG. 6 is a perspective view of the turbine blade of FIG. 5; and
- FIG. 7 is a rear view of the turbine blade of FIG. 5.
- Referring now to the drawings, FIG. 1 shows a portion of a
turbine blade 10 that requires repair. As can be seen from the figure, thetrailing edge 12 of theturbine blade 10 is provided with a plurality ofcooling holes 14. In service, one ormore cracks 16 form in the vicinity of the lowermost one 14′ of thecooling holes 14 known as the root trailing edge cooling hole. Typically, the cracks initiate from both theconcave side 18 and theconvex side 20 of theairfoil portion 22 of theturbine blade 10. Eachcrack 16 extends axially toward the leadingedge 24 of theblade 10. It has been found that thecracks 16, that fall within acceptable serviceable limits, preferably that extend less than approximately about 0.05 inches and as determined for a given blade, may be repaired using the method of the present invention. - To repair the
cracks 16, aportion 26 of the trailing edge known as the root trailing edge portion is cut back on both theconcave side 18 and theconvex side 20. This cut back is shown in FIGS. 2 and 3. As can be seen in each of these figures, the originaltrailing edge 12 is cut back by a distance or depth L to form a cut backtrailing edge portion 28. In a preferred embodiment of the present invention, the distance or depth L is greater than the length of thecrack 16. This cut back removes material in the area where thecrack 16 is located and reach fresh material where there are no cracks or microcracks. The distance or depth L is preferably less than the radius of thetrailing edge 12. - The cutting back of the root trailing
edge portion 26 may be carried out using any suitable means known in the art. Preferably, it is carried out by grinding or milling each of theconcave side 18 and theconvex side 20. - Concurrent with the cut back of each of the
sides edge portion 28 into theplatform 30 on the turbine blade. The blending must be carried out so that there is a smooth transition between the cut backtrailing edge portion 28 and theplatform 30. A unique feature of this invention is the use of a compound radius approach to achieve this smooth transition. The compound radius provides a large radius in the high stress location, while rapidly transitioning into the existing platform profile. The rapid transition eliminates a largetrailing edge 12 blunt area which would increase aerodynamic losses. As can be seen in FIG. 4, a compound radius having a major radius R1 and a minor radius R2, which compound radius preferably varies from approximately about 0.375 inches to approximately about 0.1875 inches, is used in the transition area between the cut backtrailing edge 28 and theplatform 30. By using this compound radius blending approach, the formation of a cusp on the trailing edge is avoided. - When the concave and convex sides are cut back, they are not cut back along the entire span of the
airfoil portion 22 of theturbine blade 10. Preferably, thetop half 32 of the originaltrailing edge 12 is left alone. It is then necessary to fair the cut backtrailing edge portion 28 into the original trailing edge profile to minimize aerodynamic impact. Any suitable technique known in the art which minimizes abrupt changes/discontinuities in the trailing edge geometry of theturbine blade 10 and which avoids adverse effects on the flow field, vibrations, and structural integrity may be used to fair the cut backtrailing edge portion 28 into the original trailing edge profile. As shown in FIGS. 5 and 6, preferably, the cut backtrailing edge portion 28 is faired into the original trailing edge profile at approximately about the 50% span. - After the cut back, platform blending, and trailing edge fairing steps have been completed to a desired depth, any remaining edges are blended, either by machine or by hand, to a smooth radius to minimize stress concentration and aerodynamic losses. The
edges edges - If needed, the
cooling holes 14 may be refurbished using any suitable technique known in the art. - It has been found that the service life of a
turbine blade 10 repaired as above can be increased by approximately about 2X or more by applying a thermal barrier coating to theturbine blade 10. The thermal barrier coating may comprise any suitable thermal barrier coating known in the art and may be applied using any suitable means known in the art. For example, the thermal barrier coating may be a MCrAlY coating where M is selected from the group consisting of iron, nickel, cobalt, and mixtures of nickel and cobalt such as that shown in U.S. Pat. No. 4,321,311, which is hereby incorporated by reference herein. Alternatively, the thermal barrier coating may be a MCrAlY type coating where M is nickel or cobalt and which is improved by the addition of from 0.1 to 7.0% by weight silicon and 0.1 to 2.0% by weight hafnium such as that shown in U.S. Pat. No. 4,585,481, which is hereby incorporated by reference herein. The thermal barrier coating could also be a thermally insulating ceramic coating having a pyrochlore structure such as that shown in U.S. Pat. No. 6,117,560, which is hereby incorporated by reference herein. The thermal barrier coating could also be a thermally insulating ceramic coating containing gadolinia and zirconia such as that shown in U.S. Pat. No. 6,177,200, which is hereby incorporated by reference herein. The thermal barrier coating may be applied to the turbine blade using any of the techniques shown in the aforementioned U.S. Patents. - It has been found desirable to modify the
tip portion 46 of theturbine blade 10 to increase its length prior to applying the thermally insulating ceramic coating to theturbine blade 10. This is to account for the reduced substrate temperatures which will be encountered by theturbine blade 10 as a result of the thermally insulating ceramic coating. Thetip portion 46 is preferably modified by applying a weld material to thetip portion 46 and machining theturbine blade 10 to a predetermined length. While the weld material to be applied to thetip portion 46 may comprise any suitable welding or brazing material known in the art, it is preferred to add a nickel based alloy weld material to thetip portion 46. The added weld material helps avoid any negative clearance effects caused by the application of the thermally insulating ceramic coating. With the thermally insulating ceramic coating, theturbine blade 10 will not thermally expand as originally designed. Theturbine blade 10 will expand less, as it is cooler. This in turn creates a larger gap at thetip portion 46 in the radial direction, than is desirable from a leakage/sealing standpoint and from a performance standpoint. Thus, to accommodate the reduced tip growth, thetip portion 46 is built up with weld material and then machined to a desired predetermined length. - One of the principal advantages to adding the thermal barrier coating to the repaired
turbine blade 10 is that it reduces blade metal temperature gradients. The reduced thermal gradient combined with thicker trailing edge walls and increased fillet radius reduce airfoil root stresses and increases blade service life. In particular the thermal mechanical fatigue life, of the repaired blade is increased by 2 times or more. - Further, it is within the scope of this invention, and understood by those skilled in the art, that the method described herein may be utilized to repair a variety of blades thus advantageously providing a repaired blade with enhanced service life, as compared to that of the original blade.
- It is apparent that there has been provided in accordance with the present invention a method for repairing trailing edge cracks in turbine blades which fully satisfies the objects, means and advantages set forth hereinbefore. While the present invention has been described in the context of specific embodiments thereof, other alternatives, modifications, and variations will become apparent to those skilled in the art having read the foregoing description. Therefore, it is intended to embrace those alternatives, modifications, and variations which fall within the broad scope of the appended claims.
Claims (16)
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
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US09/887,448 US6490791B1 (en) | 2001-06-22 | 2001-06-22 | Method for repairing cracks in a turbine blade root trailing edge |
KR1020020023007A KR20030001239A (en) | 2001-06-22 | 2002-04-26 | Method for repairing cracks in a turbine blade root trailing edge |
DE60221074T DE60221074T2 (en) | 2001-06-22 | 2002-05-24 | Method for repairing cracks in the trailing edge root of a turbine blade |
EP02253667A EP1270141B1 (en) | 2001-06-22 | 2002-05-24 | Method for repairing cracks in a turbine blade root trailing edge |
JP2002180090A JP3696576B2 (en) | 2001-06-22 | 2002-06-20 | How to repair a turbine blade |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US09/887,448 US6490791B1 (en) | 2001-06-22 | 2001-06-22 | Method for repairing cracks in a turbine blade root trailing edge |
Publications (2)
Publication Number | Publication Date |
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US6490791B1 US6490791B1 (en) | 2002-12-10 |
US20020194733A1 true US20020194733A1 (en) | 2002-12-26 |
Family
ID=25391153
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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US09/887,448 Expired - Lifetime US6490791B1 (en) | 2001-06-22 | 2001-06-22 | Method for repairing cracks in a turbine blade root trailing edge |
Country Status (5)
Country | Link |
---|---|
US (1) | US6490791B1 (en) |
EP (1) | EP1270141B1 (en) |
JP (1) | JP3696576B2 (en) |
KR (1) | KR20030001239A (en) |
DE (1) | DE60221074T2 (en) |
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US6615470B2 (en) * | 1997-12-15 | 2003-09-09 | General Electric Company | System and method for repairing cast articles |
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-
2001
- 2001-06-22 US US09/887,448 patent/US6490791B1/en not_active Expired - Lifetime
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2002
- 2002-04-26 KR KR1020020023007A patent/KR20030001239A/en active IP Right Grant
- 2002-05-24 EP EP02253667A patent/EP1270141B1/en not_active Expired - Fee Related
- 2002-05-24 DE DE60221074T patent/DE60221074T2/en not_active Expired - Lifetime
- 2002-06-20 JP JP2002180090A patent/JP3696576B2/en not_active Expired - Fee Related
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Also Published As
Publication number | Publication date |
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EP1270141B1 (en) | 2007-07-11 |
EP1270141A2 (en) | 2003-01-02 |
EP1270141A3 (en) | 2003-01-15 |
DE60221074D1 (en) | 2007-08-23 |
JP3696576B2 (en) | 2005-09-21 |
KR20030001239A (en) | 2003-01-06 |
JP2003056359A (en) | 2003-02-26 |
DE60221074T2 (en) | 2008-03-13 |
US6490791B1 (en) | 2002-12-10 |
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