Abstract No.:
7160

 Scheduled at:
Thursday, June 23, 2022, Saal Brüssel 9:40 AM
Quality assurance, process and product quality


 Title:
Development of an optical inspection method for evaluating the surface condition of metal surfaces to be brazed

 Authors:
Lienhard Wegewitz / Clausthal University of Technology, Germany
Wolfgang Maus-Friedrichs / Technische Universität Clausthal, Germany
Ulrich Holländer/ Institut für Werkstoffkunde, Leibniz Universität Hannover, Germany
Friedrich Bürger/ Clausthaler Zentrum für Materialtechnik, Technische Universität Clausthal, Germany
Kai Möhwald/ Institut für Werkstoffkunde, Leibniz Universität Hannover, Germany
Hans Jürgen Maier/ Institut für Werkstoffkunde, Leibniz Universität Hannover, Germany
Philipp Moritz*/ Technische Universität Clausthal, Germany

 Abstract:
Up to now, there has been a lack of fast and cost-effective measurement methods with sufficiently accurate reliability for the evaluation of the brazability of component surfaces for inline quality control in brazing production. The aim of the work presented is to use spectroscopic ellipsometry to identify optical properties of metal surfaces which are suitable for making reliable statements about the surface condition of these metals with regard to their brazability. For this purpose, the surfaces of typical materials (steels, copper) used in brazing technology are modified in a defined manner (oxidized, contaminated with oils, etc.) and their optical behavior is measured by means of ellipsometry. At the same time, the adjusted surface conditions are analyzed in terms of surface science and their wetting behavior during brazing is investigated. From this, a correlation between adjusted surface states, their brazing and wetting behavior and the optical properties of the surface will be obtained in order to evaluate its brazability based on the measured optical properties of the surface. The results should enable the realization of an automatic optical inspection method for component surfaces prior to brazing. In this paper, the current status of the investigations in the research project, which will run until the end of 2022, is presented and discussed.

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