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High-performance welding of copper with green multi-kW continuous wave disk lasers
Author(s): Eva-Maria Dold; Elke Kaiser; Konrad Klausmann; Sebastian Pricking; Sebastian Zaske; Rüdiger Brockmann
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Paper Abstract

We present application results of welding copper with multi-kW truly continuous-wave Disk Lasers at the green wavelength of 515 nm. By spatially combining three commercially available 1 kW TruDisk 1020 lasers, 3 kW of green cw laser radiation is provided by a fiber with 200 μm core diameter. We achieved the following highlights by applying this laser source to copper sheets of different thicknesses: Sputter-free full penetration welding of 0.7 mm thickness has been demonstrated with excellent quality and a feed rate of 25 m/min, much faster than comparable IR wobble processes. In deep penetration welding mode, high-quality welds with depths of 1 mm and 2 mm have been obtained with feed rates of 18 m/min and 8 m/min, respectively, even in thick copper sheets, i.e., at maximum heat dissipation. 3 kW of green cw radiation allow welding depths <3.5 mm. Having proven the large potential of multi-kW green cw lasers, we give an overview on the current lab results on the power scaling of the disk laser sources. We demonstrate <2 kW green cw power with a BPP of 2.5 mm·mrad, as well as <3 kW green cw power with a BPP of 5 mm·mrad, both devices being realized with a compact footprint of less than 1 m2. Summarizing, our application results prove the high-power green cw disk lasers to be the perfect choice for high-performance welding of copper with an excellent quality.

Paper Details

Date Published: 27 February 2019
PDF: 6 pages
Proc. SPIE 10911, High-Power Laser Materials Processing: Applications, Diagnostics, and Systems VIII, 109110U (27 February 2019); doi: 10.1117/12.2509925
Show Author Affiliations
Eva-Maria Dold, TRUMPF Laser GmbH (Germany)
Elke Kaiser, TRUMPF Laser GmbH (Germany)
Konrad Klausmann, TRUMPF Laser GmbH (Germany)
Sebastian Pricking, TRUMPF Laser GmbH (Germany)
Sebastian Zaske, TRUMPF Laser- und Systemtechnik GmbH (Germany)
Rüdiger Brockmann, TRUMPF Laser- und Systemtechnik GmbH (Germany)

Published in SPIE Proceedings Vol. 10911:
High-Power Laser Materials Processing: Applications, Diagnostics, and Systems VIII
Stefan Kaierle; Stefan W. Heinemann, Editor(s)

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