The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Sep. 24, 2002
Filed:
Dec. 27, 2000
Gerald Richard Crawmer, Saratoga, NY (US);
General Electric Company, Schenectady, NY (US);
Abstract
A steam turbine rotor is constructed from a first forging of a first alloy, and a second forging of a second alloy different than the first alloy. For example, one of the alloys is suitable for use in a high temperature environment and the other in a low temperature environment. The forging ends are contoured so as to provide central portions, which may be disc-shaped, and the contoured portions may be in the shape of truncated cones. A first weld, such as a root weld formed by inertia, friction, or electroslag welding, joins the central portions, and the contoured portions are joined by a second weld different than the first weld, such as a submerged arc weld. This allows the rotor forgings to be joined in relatively inexpensive horizontal facilities, and reduces the demands on the welding technology required to obtain a sound root weld.