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Ercandogu: Process state estimation in ultrasonic metal welding from airborne sound recordings

Juni 9 @ 09:00 - 09:30

Ultrasonic metal welding is a solid-state bonding process in which metal workpieces are
exposed to high-frequency vibrations. It is an effective joining technology with a wide range
of industrial applications with its unique advantages. The vibrations of mechanical parts in
the machine cause fluctuations in the air pressure, thus causing sound waves to radiate. The
radiating sound may be directly related to the component vibrations. As a result, changes
in the process can be monitored by detecting changes in the airborne sound. This thesis
aims to study the airborne sound radiated during ultrasonic metal welding and estimate the
relation between the sound and the process stages. Several features are examined to achieve
this goal, starting with frequency analysis. The spectrogram of the airborne sound shows
that the sound emitted has a mostly constant amplitude and contains many frequencies,
most notably the fundamental frequency and its harmonics. These frequencies are examined
in relation to time in order to define transitions between different stages. Additionally, a
relationship between the welding strength and the welding frequency is investigated but no
correlation was discovered. Two ratios are derived to measure nonlinearity, one comparing
the fundamental frequency with all other frequencies, and the other with its harmonics. The
analysis presents comprehensive tables showing the relationship between welding stages and
the studied features. It is evident from the tables that there is a correlation between the
frequency behaviors and the stages of the process.

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Zoom-Meeting-ID: 967 6798 9931
Passwort: 879147


Juni 9
09:00 - 09:30


IHTA Seminarraum (60 Persons) and Zoom-Meeting (Hybrid)
Kopernikusstr. 5
Aachen, 52074 Deutschland
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