Metal working – Method of mechanical manufacture – Impeller making
Reexamination Certificate
2005-06-30
2009-12-22
Bryant, David P (Department: 3726)
Metal working
Method of mechanical manufacture
Impeller making
C029S889210, C029S889700, C029S402070
Reexamination Certificate
active
07634854
ABSTRACT:
A method is provided for joining blades to blade roots or rotor disks when manufacturing and/or repairing gas turbine blades or integrally bladed gas turbine rotors. A blade and a blade root or rotor disk that is to be joined to the blade are supplied, and provided with a thickening in sections that are to be joined together. The sections of the blade and the blade root or rotor disk that are to be joined together are machined so as to form recesses and; c) are then aligned relative to each other, opposite recesses defining at least one groove-shaped seam preparation. The blade and the blade root or rotor disk are joined in the area of the or each seam preparation by means of laser power build-up welding and the joined blade and blade root or rotor disk are machined so as to provide a gas turbine blade or an integrally bladed gas turbine rotor having a predefined geometrical profile.
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Karl-Hermann Richter, Sven Orban, Steffen Nowotny, “Laser cladding of the titanium alloy TI6242 to restore damaged blades”, Proceedings of the 23rdInternational Congress on Applications of Lasers and Electro-Optics 2004, Oct. 7, 2004, XP002360040, ICALEO 2004, available at http://www.mtu.de/channel/files/pdf/laser—cladding—of—the—titanium—alloy.pdf.
Bernd Stimper, “Lasereinsatz zum Generieren und Reparieren in der Triebwerkteileinstandsetzung”, OTTI Profiforum—Lasereinsatz in der Fertigung und Materialbearbeitung—Regensburg, Sep. 30, 2003, XP002360041, available at: http://www.mtu.de/channel/files/pdf/3272Stimper.pdf See Search Report of PCT/DE2005/0011550 In English.
Bryant David P
Davidson Davidson & Kappel LLC
MTU Aero Engines GmbH
Walters Ryan J
LandOfFree
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