Berlin 2018 – wissenschaftliches Programm

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MM: Fachverband Metall- und Materialphysik

MM 47: Poster Session II

MM 47.44: Poster

Mittwoch, 14. März 2018, 18:30–19:45, Poster C

Surface Characterization of CuCrZr-Electrodes for Resistance Spot Welding — •Philipp Moritz^1,2, Oliver Höfft¹, Hagen Kerl², Volker Wesling², and Wolfgang Maus-Friedrichs^1,2 — ¹Institute of Energy Research and Physical Technologies, Clausthal University of Technology, Leibnizstr. 4, 38678 Clausthal-Zellerfeld — ²Clausthal Centre of Material Technology, Clausthal University of Technology, Agricolastr. 2, 38678 Clausthal-Zellerfeld

Resistance spot welding is an established technology in the automotive industry. An important aspect in this process is the interaction of the welding electrodes with the steel body sheet. After a certain number of weldings the electrodes produce an irregular welded joint. It is presumed that adherences and diffusion processes at the interface limit the life time of the electrodes significantly.

To understand these interactions, the surfaces of CuCrZr-electrodes are studied with X-ray photoelectron spectroscopy (XPS), Scanning electron microscopy (SEM) and Energy dispersive X-ray spectroscopy (EDX). For the experiments conventional steel plates with AlSi-coatings were used for welding. The electrodes were studied after 0, 10 and 100 welding processes, respectively.

SEM and EDX measurements show that a deposition of AlSi-sheet material was formed on the CuCrZr-electrode surface. Depth profiles indicate that the elements of the steel sheet diffuse into the surface of the electrode. These effects increase with the number of welding processes.