Dr. V. Prieb
Structural Aspects of Metal Joining,
Stretching and Stamping Using Ultrasonics
"MFS-Büro Dr. Prieb", Berlin, 1999
(on behalf of "Ultrasonics Steckmann GmbH")
(US-Welding aluminum plate absorbers with copper water pipes in solar collectors)
Abstract: The structure and component distribution at the weld interface of ultrasonically joined
(welded) metal pairs was investigated using scanning electron microscopy (SEM)
and light optical microscopy (LOM) in order to understand the bonding
mechanisms and processes which enable the ultrasonic joining of metals. The
metal pairings copper-copper, copper-aluminum, copper-silver (silver-coated
brass) and copper-steel were welded. Thus, it can be concluded
about the main mechanisms responsible for ultrasonic joining of metals.
The plastification and plastic deformation of the
metal workpieces being joined or stretched while held under constant contact
pressure plays an essential role in ultrasonic welding.
Deformation stages and mechanisms peculiar to the ultrasonic joining process
are theoretically discussed.
Technological and technical problems are discussed too.
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