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@PHDTHESIS{Balz:796060,
author = {Balz, Isabel},
othercontributors = {Reisgen, Uwe Kaspar and Vorländer, Michael},
title = {{P}rozessanalyse der thermo-mechanischen {V}orgänge
während der {V}erbindungsbildung beim
{M}etall-{U}ltraschallschweißen},
volume = {3/2020},
school = {RWTH Aachen University},
type = {Dissertation},
address = {Aachen},
publisher = {Shaker Verlag},
reportid = {RWTH-2020-08744},
isbn = {978-3-8440-7537-3},
series = {Aachener Berichte Fügetechnik},
pages = {1 Online-Ressource (XIV, 117, xi Seiten) : Illustrationen,
Diagramme},
year = {2020},
note = {Veröffentlicht auf dem Publikationsserver der RWTH Aachen
University; Dissertation, RWTH Aachen University, 2020},
abstract = {Ultrasonic Metal Welding (USMW) is a particularly suitable
process for joining electric components and its use is
growing due to the increasing complexity of electronic
systems. Despite its widespread application, USMW suffers
from quality variations. These are often unclear due to a
lack of deep scientific knowledge regarding the complex
interactions between tools and joining parts during welding
process. Therefore, the aim of this doctoral thesis is to
describe thermo-mechanical processes in the mechanical
overall-system, consisting of horn, anvil and joining parts,
which occur during bonding formation in USMW of similar
sheet metal joints of copper. This work is divided in three
main parts: Chapters 4 and 5 present the experimental setup
with process data acquisition system, the processing of the
measured signals and an evaluation concerning their
suitability for process analysis. For this purpose, in
addition to the machine internal sensors, the oscillation
behavior of the mechanical overall-system during the USMW
process is recorded externally by a high-speed camera and
two laser Doppler vibrometers. The processed measurement
signals are used in chapter 6 to identify characteristic
transient process signals. In order to be able to assign
concrete states of bonding formation to these signals later
on, the welding process is stopped after defined times and
the bonding formation is characterized under microstructural
and fracture-mechanical aspects. Finally, in Chapter 7, the
thermo-mechanical processes taking place during bonding
formation are described by a process phase model by
correlating characteristic process signals with the
mechanisms of bond formation. The final verification under
changed process conditions also provides information about
the interchangeability of the model. Regarding the current
state of research, the results of the present work allow
deeper insight into the thermo-mechanical processes taking
place in USMW. Thus, the in-situ process analysis is helpful
to a more profound understanding and leads to an improved
process capability of the USMW.},
cin = {417610},
ddc = {620},
cid = {$I:(DE-82)417610_20040731$},
typ = {PUB:(DE-HGF)11 / PUB:(DE-HGF)3},
doi = {10.18154/RWTH-2020-08744},
url = {https://publications.rwth-aachen.de/record/796060},
}
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