Bolt hole repair technique

Patent metadata

Field	Value
Publication number	US-9227278-B2
Application number	US-8070108-A
Country	US
Kind code	B2
Filing date	Apr 4, 2008
Priority date	Oct 13, 2005
Publication date	Jan 5, 2016
Grant date	Jan 5, 2016

Abstract

A method of hole defect repair includes removing one or more defects at or near a desired hole in a part by removing a portion of the part proximate the desired hole in a series of chain link patterns, and welding a filler material to the part after removing the chain link pattern portion of the part.

First claim

The invention claimed is:

1. A method of repairing a defect adjacent a desired hole, the method comprising:
removing at least one defect adjacent the desired hole in a base material by removing a first portion of the base material proximate to the desired hole;
removing a second portion of the base material proximate to the first portion, wherein the first and second portions create a chain of overlapping apertures adjacent to the desired hole; and
welding a filler material to the base material after removing the first and second portions of the base material.

2. The method of claim 1 , wherein the step of welding a filler material to the base material comprises utilization of conductive heat resistance welding.

3. The method of claim 1 , and further comprising removing a portion of the filler material until the desired hole shape has been obtained.

4. The method of claim 1 , wherein the first portion is removed prior to removing the second portion of the base material.

5. The method of claim 1 , wherein removing the first portion of the base material is done by drilling a first aperture in the base material.

6. The method of claim 1 , and further comprising:
positioning an insert relative to the desired hole in the base material prior to welding the filler material, wherein the insert substantially defines the desired hole for welding the filler material at a perimeter portion of the desired hole.

7. The method of claim 6 , wherein the desired hole is defined by the insert in the base material after welding the filler material, without requiring post-welding machining of the hole itself.

8. The method of claim 6 , and further comprising:
removing the insert.

9. The method of claim 1 , wherein removing the first portion of the base material is done after removal of the second portion of the base material.

10. The method of claim 1 , wherein removing the first portion and the second portion of the base material are done by drilling adjacent apertures that remove the defect adjacent the desired hole.

11. A method of repair in a part, the method comprising:
creating a substantially circular first opening in the part that is larger in diameter than a desired hole, wherein centerline axes of the desired hole and the first opening are aligned;
creating a second opening in the part, wherein the second opening is positioned proximate a perimeter of the first opening;
creating a third opening in the part adjacent the second opening, wherein the first opening, the second opening, and the third opening are contiguous; and
welding a filler material within at least portions of the first, second, and third openings.

12. The method of claim 11 , wherein the step of welding a filler material to the base material comprises utilization of conductive heat resistance welding.

13. The method of claim 11 , wherein the first opening is created before the second and third openings.

14. The method of claim 11 , wherein the second opening is substantially circular and has a centerline axis, and wherein the centerline axis of the second opening is spaced from the centerline axis of the first opening.

15. The method of claim 11 , and further comprising removing a portion of the filler material until the desired hole has been obtained.

Assignees

• Sullivan Nicole
• Rutz David A
• Kinstler Monika D
• Moor James J
• United Technologies Corp

Inventors

• Sullivan Nicole
• Rutz David A
• Kinstler Monika D
• Moor James J

Classifications

• B23P6/045

  of turbine components, e.g. moving or stationary blades, rotors, etc. · CPC title

• B23P6/007 Primary

  using only additive methods, e.g. build-up welding · CPC title