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:
Feb. 17, 1976
Filed:
Jun. 29, 1973
Applicant:
Inventors:
Takao Nakamura, Yokohama, JA;
Itsuo Hirose, Kamakura, JA;
Rokuro Misawa, Yokohama, JA;
Hidenori Horii, Yokohama, JA;
Akira Hagio, Yokohama, JA;
Tetsuo Sada, Yokohama, JA;
Assignee:
Nippon Kokan Kabushiki Kaisha, Tokyo, JA;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
B23K / ; B23K / ;
U.S. Cl.
CPC ...
228147 ; 228 175 ; 228231 ; 228240 ;
Abstract
A butt welded tube is provided having excellent properties by the steps of forming a skelp onto a round shape, butt welding the edges thereof with butt welding rolls, blowing oxygen or air into the weld zone, so that said zone is brought to a melted condition with oxidizing heat based on said blowing and some notches which are formed are blown off with said blowing, and then said tube is passed through a train of reducing rolls to obtain a smooth surface and the required dimension of said tube.