Energy produced by gas turbines is increasing all over the world. Oneimportant part in these gas turbines is the turbine blading. Improved bladesand vanes are being introduced while the industry also uses the oldgeneration of blade types. Applicable NDT methods are needed for all bladetypes. Many NDT-methods can be applied in laboratory environment. Thisoverview describes a variety of methods for blade inspection such as dyepenetrant, eddy current, radiography and ultrasonic methods. Some of thesemethods are considered on the basis of the experience gained inmeasurements. One new UT-method is described, easily transferable forpractical inspections on site. A wide aperture VTT probe has been developedfor the purpose. With this special probe different blade properties can bemeasured, such as coating thickness, detection and size of cracks,delaminations as well as mechanical properties.
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