Method for rejuvenating cooling passages within a turbine airfoil

摘要

An electrode (110) for rejuvenating a cooling passage (101) within an airfoil, the electrode including a tip (130), an end (140), a conductive core (116) extending between the tip and the end, and an insulating coating (118) disposed on the conductive core. The insulating coating exposes a number of conductive strips (150) of the conductive core extending between the tip and the end. The insulating coating forms a number of insulating portions (160) and further exposes a number of spacer portions (133) of the conductive core longitudinally positioned between the insulating portions. The insulating portions substantially span a distance between the tip and the end and are positioned between the conductive strips. <IMAGE> <IMAGE>