Turbine blade repair

摘要

A method of and apparatus for repairing turbine blades wherein the repair requires the input of considerable thermal energy during a welding or brazing operation for example involves the step of predistorting the blade prior to the welding or brazing operation so that the distortion that is expected to occur during welding or brazing leaves the blade after repair in its proper position. A clamp means (Figs 2 to 5, not shown) may be provided to prevent parts of an individual blade from being predistorted so as to localise the predistortion in the required area. A tool 163 for predistorting the blade 161 ensures that a physical force may be applied to a local area of the blade. Another distorting tool is shown in Figs. 6 to 9. A stress relieving heat treatment is applied to the blade after the repair.