Abstract
In this paper, the different types of damage occurring in components of the hot section of gas turbines and the techniques used in their restoration are described. Brazing as a repair technique and its use on typical types of damage is discussed and illustrated. Welding is reported to be useful only when the damage is limited to small areas of blades or vanes, because of the composition of super alloys and the deformation caused by the local heat input. Brazing is discussed with respect to brittleness, erosion, corrosion resistance, and the size and shape of the defects to be repaired. Examples of slurry brazes are illustrated by pictures and micrographs and the parameters for such brazing are discussed briefly to show the interaction of brazing with the various steps in a repair and heat-treatment procedure.
MST/100
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