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@PHDTHESIS{GonzalezOlivares:852635,
author = {Gonzalez Olivares, Erick Alejandro},
othercontributors = {Reisgen, Uwe and Bobzin, Kirsten},
title = {{H}ybridization between plasma and {MIG} processes in a
tandem configuration for aluminum joints},
volume = {2/2022},
school = {RWTH Aachen University},
type = {Dissertation},
address = {Düren},
publisher = {Shaker Verlag},
reportid = {RWTH-2022-08232},
series = {Aachener Berichte Fügetechnik},
pages = {1 Online-Ressource : Illustrationen, Diagramme},
year = {2022},
note = {Druckausgabe: 2022. - Auch veröffentlicht auf dem
Publikationsserver der RWTH Aachen University; Dissertation,
RWTH Aachen University, 2021},
abstract = {Welding is one of the key manufacturing processes in the
metal mechanic industry, for this reason, any improvement in
quality and efficiency leads to enhanced overall
productivity. On the other hand, aluminum alloys are
increasingly becoming a fundamental part of the task of
reducing the weight of metal structures in means of
transport, as a means of reducing CO2 emissions. The union
or hybridization between two welding processes as a means of
increasing productivity in joint applications is a widely
used and studied technique. An alternative hybrid process
that is being studied in recent years is the Plasma-MIG
process in a tandem configuration. This process is
characterized by having a torch arrangement on the same axis
(paraxial) with a distance between them. With this
configuration it is guaranteed that each one of its
processes maintains its unique properties. However, problems
and phenomena such as current transfer between the welding
arcs which affects the measurement of electrical signals
have been vaguely commented on in the scarce literature on
the subject. In this investigation the Plasma-MIG in tandem
configuration is characterized by gradually bringing their
torches closer together in order to observe the behavior of
their electrical signals as the arcs are coupled. In
addition, the Plasma process is configured with direct and
alternating current, in order to observe the need for
cathodic cleaning when the hybrid process is used in
aluminum alloys. Once the phenomena that occur when
hybridizing the processes are known, the interaction between
the welding processes is studied, from an energy point of
view. The objective is to observe if there is an exchange of
current between the welding processes and, if it exists, how
this affects the welding processes. The results showed that
it is possible to couple the Plasma and MIG processes in a
paraxial (tandem) configuration to make aluminum joints,
with a stable arc and greater penetration than the single
processes. The establishment of a "current path” between
the MIG and plasma arcs was noticed, which allows the
current flow between the welding process, influencing
directly the MIG arc length behavior. Moreover, it was
concluded that it is not necessary to configure alternating
current in the Plasma process to weld aluminum, because the
MIG process does the cathodic cleaning. It was also
concluded that an external magnetic field is not necessary
to stabilize the behavior of the welding arcs. The joints of
10 and 15 mm thickness presented good surface appearance,
although the hybrid process demonstrated superiority only
for the 15 mm thick joints.},
cin = {417610},
ddc = {620},
cid = {$I:(DE-82)417610_20140620$},
typ = {PUB:(DE-HGF)11 / PUB:(DE-HGF)3},
doi = {10.18154/RWTH-2022-08232},
url = {https://publications.rwth-aachen.de/record/852635},
}
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