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:
May. 30, 2023
Filed:
Apr. 24, 2019
Toyota Jidosha Kabushiki Kaisha, Toyota, JP;
Koki Nakada, Toyota, JP;
Toru Hioki, Miyoshi, JP;
Atsushi Kawakita, Miyoshi, JP;
Shuhei Ogura, Nagakute, JP;
Takashi Goto, Toyota, JP;
TOYOTA JIDOSHA KABUSHIKI KAISHA, Toyota, JP;
Abstract
A laser welding method is provided to ensure a sufficient joining strength between metal plates by increasing the area of a joining region while preventing 'burn through' of a molten metal. In the laser welding method by applying a laser beam to a surface of multiple metal plates superimposed on each other, a scanning locus with the laser beam is sequentially shifted from an inner circular scanning locus to an outer one in a predetermined joining region on the metal plates, and an emission interval is provided to temporally stop the metal-plate-surface irradiation when the scanning locus is shifted. Thus, every time the scanning locus is shifted, the molten metal due to the previous irradiation is cooled and increases its viscosity. Accordingly, the 'burn through' is prevented regardless of increase of the area of the joining region, which results in a sufficient joining strength between the metal plates.