Customer Challenge

High Pressure NGV of an aero engine exhibited cracks on its land and adjacent seal slots, requiring a weld repair process to restore the component to its original design intent. Challenges included:

  • Achieving acceptable welding at the Thermal Barrier Coating (TBC) region
  • Ensuring acceptable material properties due to microstructure changes at the weld region
  • Avoiding the possibility of weld failure

Scope

  • Create a repair solution
  • Support the customer approval process
  • Publish repair manuals

Solution

  • Developed a repair solution for validation trials
  • Determined weld parameters
  • Finalized the repair process and control parameters for buy-off by customer specialists
  • Published engine manuals with approved procedures
Solution

Benefits

  • Proved repair process through trial welding on sample blades
  • Justified the absence of TBC at the weld region through engineering analysis
  • Conducted lab tests on trial blades for microstructure validation

Results

  • Significantly reduced part burn down
  • Improved supplier delivery performance

Features

  • Trial welding on sample blades to prove the repair process
  • Engineering analysis to justify the acceptability of the absence of TBC at the weld region
  • Lab testing of trial blades for microstructure validation

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