Method for welding sheets with coatings comprising an alloy of aluminum and silicon

US12275087B2 · kind B2 · utility

Assignee

• TRUMPF LASER- UND SYSTEMTECHNIK GMBH · DE

Inventors

• Tim Hesse · Ditzingen, DE
• Nicolai Speker · Pleidelsheim, DE

Key dates

• Filing date: Jun 12, 2024
• Grant date: Apr 15, 2025
• Expiry date: Jun 12, 2044

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B23K2101/34
• WIPO field: Machine tools
• WIPO sector: Mechanical engineering

Abstract

A method of welding two metal sheets includes providing a first sheet having a first weld surface and a second sheet having a second weld surface. The first sheet has a coating includes an alloy of aluminum and silicon on the first weld surface. The method further includes irradiating the first weld surface and the second weld surface with a laser beam. The laser beam has an inner core and an outer ring with different intensity profiles. The laser beam is moved with a wobbling motion in a feed direction along an imaginary feed line and perpendicular to the imaginary feed line. A path of the laser beam along the imaginary feed line is of a periodic shape. A width of the path perpendicular to the imaginary feed line is greater than a length of a period of the path along the imaginary feed line.