Methods and laser welding devices for deep welding a workpiece

US11400548B2 · kind B2 · utility

Assignee

• TRUMPF LASER- UND SYSTEMTECHNIK GMBH · DE

Inventors

• Patrick Haug · Dinkelsbühl, DE
• Nicolai Speker · Pleidelsheim, DE

Key dates

• Filing date: May 9, 2019
• Grant date: Aug 2, 2022
• Expiry date: Sep 28, 2040

Classification

• Technology area (CPC G): Physics
• CPC primary: G02B6/02042
• WIPO field: Machine tools
• WIPO sector: Mechanical engineering

Abstract

The disclosure relates to methods and systems for deep welding a workpiece, a surface of the workpiece being irradiated by a first laser beam and a second laser beam. In a workpiece surface plane (OE) a first beam width B1 of the first laser beam is larger than a second beam width B2 of the second laser beam and in at least the workpiece surface plane (OE) the second laser beam lies inside the first laser beam. The intensity of the first laser beam alone is sufficient to produce a keyhole in the workpiece. The keyhole produced in the workpiece has a width KB in the workpiece surface plane (OE), KB substantially equaling B1, and B2≤0.75*KB. The methods and systems provide good seam quality, high penetration depth, and high welding speed.