Applying material layer on workpiece made of material containing titanium aluminide, comprises heating workpiece by induction at preheating temperature and applying powdery additive on heated surface of workpiece by deposition welding

摘要

Applying at least one material layer on a workpiece (10) made of a material containing titanium aluminide, comprises: heating the workpiece in a locally restricted area by induction at a provided preheating temperature; and applying a powdery additive on the heated surface of the workpiece by deposition welding, preferably laser-, laser-powder-, plasma-, micro plasma-, tungsten inert gas or micro tungsten inert gas-deposition welding, where the additive comprises titanium aluminide. Independent claims are also included for: (1) surface finishing, plating, dimensional correction or repairing the workpiece, comprising preparing the workpiece, and applying at least one layer of the additive; (2) plating, dimensional correction or repairing the surface of a shank, preferably acute angled groove of a component made of the material containing titanium aluminide, where a zone of the workpiece in a region of a groove-radius (14) is not heated by a predetermined additional critical temperature of the material depending on the shape of the groove, and a coil is used for inductive heating of the workpiece and/or its position is adjusted relative to the groove in the groove, preferably its shape; (3) plating, dimensional correction or repairing a functional area of a Z-groove of a top cover strip of a turbine blade, a sealing fin on a turbine bladed discs, a blade tip of a compressor rotor blade or a portion of a casing of a turbo-machine; (4) producing a workpiece, preferably a turbine- or compressor blade, or a turbine- or compressor housing, or any of their parts, comprising preparing a substrate made of the material containing titanium aluminide, and applying a layer of at least one additive until a predetermined contour of the workpiece is formed or packed; (5) a device for applying material layers on the workpiece by deposition welding, comprising a holding device for holding the workpiece, a feeding device for feeding a powdery, titanium aluminide-containing additive, a melting device for melting the additive, where the melting device is arranged for generating a laser- or plasma jet and for directing the laser- or plasma jet on the workpiece, and a preheating device for preheating the workpiece. A device is designed and equipped for carrying out the above mentioned method. The preheating device is designed and equipped for inductive, locally restricted heating the surface of the workpiece; and (6) a workpiece with at least one material layer.