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:
Jul. 03, 2018
Filed:
May. 15, 2012
Hideo Nakamura, Toyota, JP;
Tooru Sugiyama, Nagakute, JP;
Seiichi Matsumoto, Toyota, JP;
Noriaki Yamamoto, Okazaki, JP;
Yoshinori Shibata, Nagoya, JP;
Hideo Nakamura, Toyota, JP;
Tooru Sugiyama, Nagakute, JP;
Seiichi Matsumoto, Toyota, JP;
Noriaki Yamamoto, Okazaki, JP;
Yoshinori Shibata, Nagoya, JP;
TOYOTA JIDOSHA KABUSHIKI KAISHA, Toyota-shi, JP;
Abstract
Disclosed is a technique for quickly detecting a defect of a portion welded by laser beam welding. Specifically disclosed is a welding step in which a welding device is used, the welding device welding an object to be welded with a pulsed laser. In the welding step, a first photodetector receives only infrared rays having a wavelength allowing detection of a keyhole formed in a molten pool from among infrared rays radiating from a welded portion during the welding of the object, and an analyzer determines quality of the welded portion on the basis of intensity of the infrared rays received by the first photodetector.