What is meant by blending in turbine blade repair?

• A. The hand method of recontouring damaged blades and vanes
• B. A machine-based finishing process
• C. A chemical treatment to blades
• D. A replacement of damaged blades

Answer: (A)

Blending is the hand method of recontouring damaged blades and vanes. After a repair such as weld buildup or patching, material needs to be shaped back to the original airfoil form. This is done by carefully removing material and feathering the repaired area into the surrounding metal using hand tools, creating a smooth, continuous surface. The goal is to restore the aerodynamic profile and avoid any steps or sharp transitions that could disturb airflow or concentrate stress. It relies on skilled manual shaping to preserve the correct thickness and camber without over-cutting. It is not a machine-based finishing process, not a chemical treatment, and it does not involve replacing the blade.