Solid-state laser beam sources offer the possibility of generating high-brilliance laser beams with low expansion and high usable intensity at the focal point. New approaches include beam shaping with the use of core and ring fiber and, therefore, variable power distribution in the laser beam focal point and material interaction area. Particularly, high-power laser beam welding benefits from beam shaping because of the stabilizing effect on the weld pool. Furthermore, the technical progress achieved with regard to beam quality also allows one to achieve high Rayleigh lengths and, therefore, a more uniform beam diameter over the whole material thickness. In this study, investigations on high-power laser beam welding with a 24 kW disk laser beam source are conducted for three different materials (mild steel, aluminum alloy, and copper), which are of high interest for welding in different sectors. The influence of power distribution between the core and the ring as well as welding speed on weld geometry (depth and width), weld pool stability, and the resulting weld seam quality is investigated. It is shown that the welding process cannot just be scaled up in comparison with welding with lower laser beam power but has its own challenges. It is possible that high welding depths (12 mm for copper, more than 12 mm is possible for aluminum, and 25 mm for mild steel) could be achieved in one pass. To achieve this, aluminum needs the lowest energy per unit length per mm of sheet thickness and copper the highest.
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November 2024
Research Article|
October 29 2024
Investigations on opportunities and challenges of brilliant high-power laser beam welding with 24 kW and adjustable power distribution for different materials
Sarah Seffer
;
Sarah Seffer
(Conceptualization, Data curation, Formal analysis, Investigation, Methodology, Visualization, Writing – original draft)
1
Laser Zentrum Hannover e.V.
, Hollerithallee 8, 30419 Hannover, Germany
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Oliver Seffer
;
Oliver Seffer
(Formal analysis, Writing – original draft, Writing – review & editing)
1
Laser Zentrum Hannover e.V.
, Hollerithallee 8, 30419 Hannover, Germany
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Jörg Hermsdorf
;
Jörg Hermsdorf
(Funding acquisition, Supervision, Writing – review & editing)
1
Laser Zentrum Hannover e.V.
, Hollerithallee 8, 30419 Hannover, Germany
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Stefan Kaierle
Stefan Kaierle
(Funding acquisition, Supervision, Writing – review & editing)
1
Laser Zentrum Hannover e.V.
, Hollerithallee 8, 30419 Hannover, Germany
2
Leibniz Universität Hannover, Institute of Transport and Automation Technology (ITA)
, An der Universität 2, 30823 Garbsen, Germany
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J. Laser Appl. 36, 042063 (2024)
Article history
Received:
June 27 2024
Accepted:
October 12 2024
Citation
Sarah Seffer, Oliver Seffer, Jörg Hermsdorf, Stefan Kaierle; Investigations on opportunities and challenges of brilliant high-power laser beam welding with 24 kW and adjustable power distribution for different materials. J. Laser Appl. 1 November 2024; 36 (4): 042063. https://doi.org/10.2351/7.0001553
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