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. 19, 1980
Filed:
Apr. 19, 1978
Isao Masaoka, Hitachi, JP;
Katsuyuki Imai, Hitachi, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
A method for butt welding of austenitic stainless steel piping with forced cooling of the inside by the flow of a cooling medium comprises the steps of initially welding the pipe ends together by a root pass prior to the inflow of the cooling medium so as to prevent leakage of the medium to the outside, introducing an insert for constraining the flow of the cooling medium into the pipe, and welding the junction while forcing the medium to flow through the space between the insert and the surrounding wall of the pipe, the insert constructed so that it increases the flow velocity of the cooling medium to the maximum in the vicinity of the welded joint being formed.