Method of repairing a transition piece of a gas turbine engine

摘要

A method of weld repairing an air-cooled aft frame (26) of a transition piece (18) of a gas turbine engine (10). The transition piece (18) has an interior surface coated with a ceramic coating. The aft frame (26) has a surface (28) with cooling holes therein and from which cracks have propagated. The method includes removing the transition piece (18) from the engine (10) and, without removing the ceramic coating or the aft frame (26) from the transition piece (18), weld repairing the cracks by performing a laser beam welding technique that deposits a filler material on the surface (28) but does not close the cooling holes in the surface (28). The surface (28) of the aft frame (26) can be machined to remove excess filler material prior to re-installing the transition piece (18) in a gas turbine engine (10).