Siemens Energy, Inc.

Siemens Aktiengesellschaft

David W Hunt

David B Allen

Gerald Joseph Bruck

Allister William James

Michael Ott

Karsten Kolk

Harald Hoell

Douglas J Arrell

Petya M Georgieva

Harald Nimptsch

Kenneth M Tamaddoni-Jahromi

Voids, cracks or other similar defects in substrates of thermal barrier coated superalloy components, such as turbine blades or vanes, are filled with resin, without need to remove substrate material surrounding the void by grinding or other processes. The resin is cured at a temperature under 200&#xb0; C., eliminating the need for post void-filling heat treatment. The void-filled substrate and resin are then coated with a thermal barrier coating.

Turbine superalloy component defect repair with low-temperature curing resin

A method for welding to a superalloy material without causing cracking of the material. The method includes the steps of depositing a weld strip () of a weldable material onto a superalloy substrate material () using a spray deposition process () and then forming a weldment () to the weld strip. None or a controlled amount of the substrate material () is melted during the weld in order to maintain the concentration of strengthening elements in the local melt within a zone of weldability. The spray deposition process may be a thermal process such as HVOF or a cold spray process. A groove () may be formed in a surface () of the superalloy substrate material to receive the weld strip. A diffusion heat treatment step may be used to improve adhesion between the weld strip and the superalloy material.

Sprayed weld strip for improved weldability

A rotor for an axial flow turbomachine is provided. The rotor includes a plurality of rotor discs that are arranged in stacks and clamped together with at least one tie rod. At least one of the rotor discs of the rotor comprises a smaller outer diameter than one of the neighboring rotor discs and that the difference in diameter is compensated by a drum surrounding the rotor disc with the smaller outer diameter as a ring. The drum may be made of a heat resistant material. The rotor discs surrounded by the drum may be made of a less expensive material. Furthermore, the drum may include at least one more blade ring than the rotor discs that are surrounded by the drum.

Rotor for an axial flow turbomachine

A friction stir welding method including: feeding a filler material through a first passage in a friction stir weld tool and into a substrate during friction stir welding of the substrate; and rotating the filler material with respect to the substrate while feeding the filler material. In this method, heat generated by rotational frictional contact of the filler material contributes to plasticization of the filler material.

Filler rotated friction stir welding

A hybrid cast component () including both a columnar grained region () and a single crystal region () integrally formed and joined along a metallurgical boundary () in a single casting operation without the need for any weld or braze. A gas turbine blade formed as such may include a columnar grained airfoil and a single crystal platform without any necessity for a thermally formed joint at the blade fillet area.

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Orlando, FL, United States of America

David W Hunt