Repaired turbine exhaust strut heat shield vanes and repair methods
A method of repairing a turbine exhaust case strut heat shield vane includes removing a damaged portion of the vane, solution heat treating the vane, attaching a replacement section to the vane, and relieving local stresses in an attachment area between the replacement section and the vane.
1. A method of repairing a turbine exhaust case strut heat shield vane, the method comprising:
removing a damaged portion of the vane;
solution heat treating the vane;
attaching a replacement section to the vane, wherein attaching a replacement section to the vane comprises welding the replacement section;
cooling one or more portions of a strut around which the vane is arranged to protect the portions of the strut during welding; and
relieving local stresses in an attachment area between the replacement section and the vane.
2. The method of claim 1 , wherein removing a damaged portion of the vane comprises at least one of die grinding and cutting the damaged portion.
3. The method of claim 1 , wherein the damaged portion comprises a first material and the replacement section comprises a second material.
4. The method of claim 3 , wherein the first material and the second material are substantially the same.
5. The method of claim 3 , wherein the first material and the second material are different from one another.
6. The method of claim 5 , wherein the first material comprises a nickel-chromium-molybdenum alloy and the second material comprises a nickel-chromium-iron-molybdenum alloy.
7. The method of claim 1 , wherein removing a damaged portion of the vane comprises removing a damaged portion of a leading edge of the vane.
8. The method of claim 1 , wherein solution heat treating the vane comprises heat treating the vane in a protective atmosphere of at least one of Argon, Hydrogen, and Helium.
9. The method of claim 1 , wherein solution heat treating the vane comprises heat treating the vane in a vacuum.
10. The method of claim 1 , wherein solution heat treating the vane comprises:
heating the vane at 1350° F.+/−25° F. (732° C.+/−13.9° C.) for 4 hours+/−10 minutes;
cooling the vane from 1350° F.+/−25° F. to 1200° F. (649° C.)+/−25° F. at a rate of 100° F. (38° C.)+/−25° F. per 1 hour+/−10 minutes; and
heating the vane at 1200° F.+/−25° F. for 3 hours+/−10 minutes.
11. The method of claim 1 , wherein welding the replacement section to the vane comprises butt-welding the replacement section.
12. The method of claim 1 further comprising removing material from a welded connection between the replacement section and the vane.
13. The method of claim 1 , wherein relieving local stresses in an attachment area between the replacement section and the vane comprises heat treating the vane in a protective atmosphere of at least one of Argon, Hydrogen, and Helium.
14. The method of claim 1 , wherein relieving local stresses in an attachment area between the replacement section and the vane comprises heat treating the vane in a vacuum.
15. The method of claim 1 , wherein relieving local stresses in an attachment area between the replacement section and the vane comprises:
heating the vane at 1350° F.+/−25° F. (732° C.+/−13.9° C.) for 4 hours+/−10 minutes;
cooling the vane from 1350° F.+/−25° F. to 1200° F. (649° C.)+/−25° F. at a rate of 100° F. (38° C.)+/−25° F. per 1 hour; and
heating the vane at 1200° F.+/−25° F. for 3 hours+/−10 minutes.
16. A method of repairing a turbine exhaust case strut heat shield vane, the method comprising:
removing a damaged portion of the vane;
solution heat treating the vane;
attaching a replacement section to the vane;
cooling one or more portions of a strut around which the vane is arranged; and
relieving local stresses in an attachment area between the replacement section and the vane.