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@PHDTHESIS{Hummel:1010404,
author = {Hummel, Marc Daniel},
othercontributors = {Häfner, Constantin Leon and Reisgen, Uwe},
title = {{S}ynchrotron-basierte in situ {A}nalyse
wellenlängenabhängiger {P}rozessphänomene beim
{L}aserstrahlschweißen von {K}upfer; 1. {A}uflage},
school = {RWTH Aachen University},
type = {Dissertation},
address = {Aachen},
publisher = {Apprimus Verlag},
reportid = {RWTH-2025-04084},
isbn = {978-3-98555-269-6},
series = {Ergebnisse aus der Lasertechnik},
pages = {1 Online-Ressource : Illustrationen},
year = {2025},
note = {Druckausgabe: 2025. - Auch veröffentlicht auf dem
Publikationsserver der RWTH Aachen University. - Weitere
Reihe: Lasertechnik. - Weitere Reihe: Edition Wissenschaft
Apprimus; Dissertation, RWTH Aachen University, 2024},
abstract = {The increasing demand for electrical systems and battery
storage requires highquality and efficient welding processes
for copper materials. These offer maximum electrical
conductivity but are also challenging to process due to
their high reflectivity for laser radiation in the near
infrared range. Novel laser beam sources in the visible
wavelength range of 515 nm offer an alternative for
established welding processes due to their higher
absorptivity on copper. For these laser beam sources to be
used industrially, fundamental process phenomena must be
understood and differences to the current state of the art
must be known. In this work, the laser beam welding of
copper-based alloys in the form of CuSn6and Cu-ETP with
laser beam sources of 515 nm and 1030/1070 nm laser beam
wavelength is examined. For this purpose, a diagnostic
methodology for the special case of laser beam welding is
designed on basis of phase-contrast imaging with synchrotron
radiation. Temporal resolutions of 5000 Hz and spatial
resolutions of 6 µm are achieved. This approach is used to
investigate fundamental process phenomena in situ during
welding, using the two different laser beam wavelengths. The
focus is on quality-determining factors such as welding
depth, weld seam width and porosity. In addition, the
high-resolution visualization of internal process phenomena
is used to analyse the laser-material interaction as a
function of laser process parameters such as laser power and
feed rate. The knowledge gained will be used to further
develop a welding methodology with superimposed spatial and
temporal power modulation. The result is an improvement of
the welding depth consistency at the weld seam root and
enables flexible control of the welding depth. The welding
method is demonstrated in application using a dissimilar
joining configuration of copper and stainless steel in butt
joint configuration. Through an approach of combined basic
research and consistent transfer of knowledge into
application, this work contributes to the expansion of
process understanding for laser beam welding of copper.},
cin = {418710},
ddc = {620},
cid = {$I:(DE-82)418710_20140620$},
pnm = {SFB 1120 A01 - Steuerung von Geometrie und Metallurgie beim
Laserstrahl-Mikroschweißen durch Beeinflussung der
Schmelzbaddynamik über örtlich und zeitlich angepassten
Energieeintrag (A01) (260036706) / SFB 1120:
Bauteilpräzision durch Beherrschung von Schmelze und
Erstarrung in Produktionsprozessen},
pid = {G:(GEPRIS)260036706 / G:(GEPRIS)236616214},
typ = {PUB:(DE-HGF)11 / PUB:(DE-HGF)3},
doi = {10.18154/RWTH-2025-04084},
url = {https://publications.rwth-aachen.de/record/1010404},
}
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