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:
Jun. 29, 2021
Filed:
Sep. 18, 2018
Trumpf Laser- Und Systemtechnik Gmbh, Ditzingen, DE;
Nicolai Speker, Pleidelsheim, DE;
Marcel Schäfer, Ditzingen, DE;
Philipp Scheible, Illingen, DE;
Thomas Graf, Nufringen, DE;
Peter Stritt, Stuttgart, DE;
TRUMPF Laser-und Systemtechnik GmbH, Ditzingen, DE;
Abstract
A laser beam directed is moved relative to a workpiece to weld along a weld seam and form a weld pool in the area surrounding the laser beam. The weld pool has a characteristic oscillation frequency f, and a laser power is modulated with a modulation frequency f and a modulation amplitude Π=1−P/P, where Pis minimal and Pis maximal laser power during a modulation period. For a normalized characteristic oscillation frequency Λand a normalized modulation frequency Λ, Λ≥2.2*Λ, with Λ=f·d/ν, where ν is the feed rate of the laser beam, and dis diameter of a beam focal spot. Also, Λ=f·d/v, where fis a measured characteristic oscillation frequency, dthe diameter of the beam focal spot, and vis the feed rate of laser beam, all during a test measurement without modulation of the laser power.