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Scarfed Repair

Below is a review of the general outline for steps in performing composite repair, but with detail added specifically for a scarfed repair with flush bonded repair patch.
1. Inspect for extent of damage:
  • Visual
  • Tap, Ultrasonic, and/or X-rays
2. Get best access possible, both sides if feasible.
3. Remove all damaged and delaminated material.
  • Circular or rounded corners
4. Grind away scarf angle taper:
  • Smooth, flat ground surface
5. Determine ply orientations and materials of original structure.
6. Replace plies:
  • Adhesive layer first
  • One or more filler plies, orientation not important
  • Repair plies - match orientations with original structure
  • Extra plies - usually orientation matches original outer ply
  • Often an outer adhesive layer
7. Vacuum-bag and cure repair plies as required
8. Trim to net edge dimensions after cure, if necessary.
9. Inspect repair for delaminations, inclusions, proper cure documentation, etc.
10. Sand and finish as required.
  • Do not sand into fibers of repair plies.
Published courtesy of Abaris Training Resources, Inc
http://www.abaris.com
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