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Stretching and Stamping Using Ultrasonics V. Prieb "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 chosen. Sharply defined contact boundaries without evidence of a weld seam were observed in all cases. SEM composition analysis shows that no mixing of the metallic components occurred by melting or diffusion at the contact inter-face. 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 discussed. Technological and technical problems are discussed too. More: Article (full script with pictures, english) as PDF-file Home |