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:
Aug. 04, 1998
Filed:
Sep. 08, 1995
Hermann O LaGally, Greensburg, PA (US);
Larry M Kozak, Greensburg, PA (US);
Semur P Sathi, Monroeville, PA (US);
Westinghouse Electric Corporation, Pittsburgh, PA (US);
Abstract
The wall of a pressure vessel tube having cracks or other discontinuities is repaired by localized melting with the addition of an alloying material. The melting reforms or eliminates the discontinuity while the alloying material improves the physical and chemical properties of the reformed tube wall. The alloying material may be added as an insert or as a weld wire. The insert may be melted in only its center section to ensure that the entire weld is properly alloyed. Sections of the insert which are not melted may be expanded to be in intimate contact with the tube. The weld wire feed means may be integral with the welding head. A post-weld stress relief process may be applied to the welded area to reduce residual stress generated by the welding operation.