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:
Oct. 19, 2021
Filed:
Jul. 14, 2016
GM Global Technology Operations Llc, Detroit, MI (US);
David Yang, Shanghai, CN;
Wu Tao, Shanghai, CN;
GM GLOBAL TECHNOLOGY OPERATIONS LLC, Detroit, MI (US);
Abstract
A method of laser spot welding a workpiece stack-up () that includes at least two overlapping steel workpieces () is disclosed. The method includes directing a plurality of laser beams (″) at the top surface () of the workpiece stack-up to create a molten steel weld pool () that penetrates into the stack-up. The molten steel weld pool is then grown to penetrate further into the stack-up by increasing an overall combined irradiance of the laser beams while reducing the total projected sectional area () of the laser beams at a plane of the top surface of the workpiece stack-up. Increasing the overall combined irradiance of the laser beams may be accomplished by moving the focal points (″) of the laser beams closer to the top surface or by reducing the mean angle of incidence () of the laser beams so as to reduce the eccentricity of the individual projected sectional areas of the laser beams.