PROCESS OF MASKING COOLING HOLES OF A GAS TURBINE COMPONENT

摘要

Process of masking cooling holes (4) of a gas turbine component (1) with an external surface (6), comprising a cavity (2) and a plurality of cooling hol es (4) before coating the gas turbine component (1), comprising the steps of first applying a mask material (5) to the cooling holes (4) so that the cooling holes are filled at least closest to the external surface (6), where by the mask material (5) contains a substance which fluoresces under ultraviole t light and a filler material. Then the mask material (5) within the cooling holes (4) is thickening. An inspection using ultraviolet light to locate any unwanted residual mask material (5) on the external surface (6) is carried o ut and unwanted residual mask material (5) is removed before the coating (8) is applied to the external surface (6) of the component (1) and the masked cooling holes (4). In the end the mask material (5a) is removed from the cooling holes (4).