Method for the laser welding of a composite material to a component, and laser-weldable composite material for such a method

US8153929B2 · kind B2 · utility

Assignee

• Alanod Aluminium-Veredlung GmbH & Co. KG · DE

Inventors

• Harald Küster · Goldkronach, DE
• Dimitrios Peros · Siegen, DE

Key dates

• Filing date: Nov 20, 2009
• Grant date: Apr 10, 2012
• Expiry date: Jul 17, 2030

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T428/265
• WIPO field: Machine tools
• WIPO sector: Mechanical engineering

Abstract

The invention relates to a method for the laser welding of a composite material (V) to a component (11) in particular for the production of a solar collector element (E), wherein the composite material (V) comprises a strip-shaped substrate (1) composed of a metal having high reflectivity to laser radiation, said substrate having a first side (A) and a second side (B), wherein a dielectric coating (7) is situated at least on the first side (A), and wherein, in order to produce a weld seam, a laser beam (L) is projected at an acute orientation angle (μ) at least onto the first side (A) of the substrate (1) provided with the dielectric coating (7). In order to improve the energy efficiency of the laser radiation used, it is proposed that the dielectric coating (7) has a thickness (DB) in the range of 140 nm to 210 nm and the laser beam (L) is radiated in at an orientation angle (μ), in particular in focused fashion, in such a way that the radiated-in energy of the laser beam (L) is absorbed to the extent of at least 15 percent.