Repairing method to restore components

摘要

Method for repairing turbine blades that have a film cooling opening (418) or cylindrical opening and are intended with a coating, comprises completely removing the coating from the turbine blades and applying a new ceramic or metallic laminar coating (2, 3) on the turbine blades. The opening is partially or entirely locked. The newly applied coating is removed locally in the area of the opening by focused liquid jet (6) having water and an abrasive particle. The abrasive particles have an average diameter of 44-300 mu m (325-45 Mesh), and a feed rate of 5-250 g/hour in the liquid jet. Method for repairing turbine blades that have a film cooling opening (418) or cylindrical opening and are intended with a coating, comprises completely removing the coating from the turbine blades and applying a new ceramic or metallic laminar coating (2, 3) on the turbine blades. The opening is partially or entirely locked. The newly applied coating is removed locally in the area of the opening by focused liquid jet (6) having water and an abrasive particle. The abrasive particles have an average diameter of 44-300 mu m (325-45 Mesh), and a feed rate of 5-250 g/hour in the liquid jet. The focused liquid jet has a pressure of 200-600 bar. The liquid jet is delivered by a nozzle (5), which has a diameter of 0.05-0.5 mm and/or arranged in an interval of 1-6 cm to the component. The contour of the opening is removed with the fluid jet in several cyclic passages.