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:
Mar. 28, 1995
Filed:
Nov. 19, 1993
Eiji Yoneda, Tohkai, JP;
Mitsubishi Nuclear Fuel Co., Tokyo, JP;
Abstract
A method is disclosed for welding an end plug to an open end of a surface-coated tube in order to provide a control rod. First, the end plug is brought into pressed abutment with the open end of the surface-coated tube. Then, resistance welding is performed in order to join the end plug with the open end of the surface-coated tube by applying electric current between the surface-coated tube and the end plug to heat the same while keeping the end plug pressed in abutment with the open end of the surface-coated tube. With these procedures, even when a surface-coated tube having a hard coating formed over its entire length is employed, the coating material is prevented from dissolving into the welded portion and therefore ensures an excellent welding quality, and the resulting control rod exhibits excellent characteristics over its entire length.