Blending

Removing shallow scratches from blades using sanding techniques to restore the blended surface finish to that of the original surface finish.

and also a method of repairing damaged compressor and turbine blades. The damage is removed and the area is cleaned out with a fine file to form a shallow depression with generous radii. The file marks are then removed with a fine abrasive stone so the surface of the repaired area will match the surface of the rest of the blade.