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:
Dec. 10, 2013
Filed:
Jun. 22, 2009
Koji Yano, Chiba, JP;
Kenji Oi, Kawasaki, JP;
Masahito Suzuki, Kawasaki, JP;
Toshifumi Kodama, Kawasaki, JP;
Shigeto Sakashita, Kawasaki, JP;
Koji Yano, Chiba, JP;
Kenji Oi, Kawasaki, JP;
Masahito Suzuki, Kawasaki, JP;
Toshifumi Kodama, Kawasaki, JP;
Shigeto Sakashita, Kawasaki, JP;
JFE Steel Corporation, Tokyo, JP;
Abstract
There is provided a method for manufacturing a laser welded steel pipe in which the status of laser welding is accurately assessed, and the assessment is used to modify welding conditions, so that laser welded steel pipes can be manufactured at a high yield rate and in a stable manner. Irradiation point(s) of laser beam(s), with which the longitudinal edges are irradiated from the side of the outer surface, are monitored from the side of the inner surface of an open pipe, and then conditions of welding with the laser beam(s) are assessed to be kept unchanged if any keyhole is found penetrating out of the inner surface of the open pipe, or modified if no keyhole is found penetrating out of the inner surface of the open pipe.