In laser welding, precision and reproducibility are fundamentally dependent on temporal and spatial processes of energy input. Induced by the dynamics of the melt pool, pressure equilibria in the vapor capillary, and solidification behavior, different weld seam qualities are achieved. To obtain the lowest possible defect frequency, new tailored joining strategies need to be investigated using multibeam and multiwavelength approaches. To improve the quality by influencing the process dynamics, a dual-beam approach is investigated that superimposes a stationary laser beam with a wavelength of 445 nm with a spatially modulated laser beam with a wavelength of 1070 nm. The aim is to utilize ∼10 times higher absorption of a 445 nm diode laser on copper with the high focusability of a 1070 nm fiber laser. In this context, the influence of the relative positions of the two beams to each other on the weld seam quality is investigated, while one of the beams moves either in front, behind, or coaxial to the other beam following the path of a line weld. The main objective is to observe how the laser beams influence each other and how the capillary depth and porosity vary for different parameters. To visualize the process dynamics, the welding experiments on copper are performed at the Deutsches Elektronen-Synchrotron DESY by means of in situ phase contrast videography. Quality-determining weld properties like the distribution of pores or process fluctuations are then extracted automatically from the image sequences by means of a trained neuronal network.
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November 2024
Research Article|
September 03 2024
Analysis of laser beam welding with superimposed 445 and 1070 nm wavelength lasers on copper by in situ synchrotron diagnostics
Christoph Spurk
;
Christoph Spurk
a)
(Conceptualization, Data curation, Formal analysis, Investigation, Methodology, Project administration, Resources, Software, Supervision, Validation, Visualization, Writing – original draft, Writing – review & editing)
1
RWTH Aachen University, Chair for Laser Technology LLT
, Steinbachstraße 15, 52074 Aachen, Germany
a)Author to whom correspondence should be addressed: christoph.spurk@llt.rwth-aachen.de
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Frederik Dietrich
;
Frederik Dietrich
(Data curation, Formal analysis, Investigation, Methodology, Software, Validation, Visualization, Writing – original draft)
2
RWTH Aachen University, Chair for Technology of Optical Systems TOS
, Steinbachstraße 15, 52074 Aachen, Germany
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Jan Brüggenjürgen
;
Jan Brüggenjürgen
(Data curation, Formal analysis, Investigation, Software, Supervision, Visualization)
3
Fraunhofer Institute for Laser Technology ILT
, Steinbachstraße 15, 52074 Aachen, Germany
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Marc Hummel
;
Marc Hummel
(Conceptualization, Formal analysis, Investigation, Methodology)
1
RWTH Aachen University, Chair for Laser Technology LLT
, Steinbachstraße 15, 52074 Aachen, Germany
3
Fraunhofer Institute for Laser Technology ILT
, Steinbachstraße 15, 52074 Aachen, Germany
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André Häusler
;
André Häusler
(Funding acquisition, Resources, Supervision, Writing – review & editing)
3
Fraunhofer Institute for Laser Technology ILT
, Steinbachstraße 15, 52074 Aachen, Germany
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Alexander Olowinsky
;
Alexander Olowinsky
(Funding acquisition, Project administration, Resources, Supervision)
3
Fraunhofer Institute for Laser Technology ILT
, Steinbachstraße 15, 52074 Aachen, Germany
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Arnold Gillner
;
Arnold Gillner
(Funding acquisition, Methodology, Project administration, Resources, Supervision)
1
RWTH Aachen University, Chair for Laser Technology LLT
, Steinbachstraße 15, 52074 Aachen, Germany
3
Fraunhofer Institute for Laser Technology ILT
, Steinbachstraße 15, 52074 Aachen, Germany
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Felix Beckmann
;
Felix Beckmann
(Resources, Supervision)
4
Institute of Materials Physics, Helmholtz-Zentrum Hereon
, Max-Planck-Str.1, 21502 Geesthacht, Germany
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Julian Moosmann
Julian Moosmann
(Resources, Supervision)
4
Institute of Materials Physics, Helmholtz-Zentrum Hereon
, Max-Planck-Str.1, 21502 Geesthacht, Germany
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a)Author to whom correspondence should be addressed: christoph.spurk@llt.rwth-aachen.de
J. Laser Appl. 36, 042002 (2024)
Article history
Received:
July 01 2024
Accepted:
August 14 2024
Citation
Christoph Spurk, Frederik Dietrich, Jan Brüggenjürgen, Marc Hummel, André Häusler, Alexander Olowinsky, Arnold Gillner, Felix Beckmann, Julian Moosmann; Analysis of laser beam welding with superimposed 445 and 1070 nm wavelength lasers on copper by in situ synchrotron diagnostics. J. Laser Appl. 1 November 2024; 36 (4): 042002. https://doi.org/10.2351/7.0001598
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