Influence of direct electric current on wetting behavior during brazing

Kirsten BOBZIN, Wolfgang WIETHEGER, Julian HEBING, Lidong ZHAO, Alexander SCHMIDT, Riza ISKANDAR, Joachim MAYER

Front. Mech. Eng. ›› 2020, Vol. 15 ›› Issue (3) : 496-503.

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Front. Mech. Eng. ›› 2020, Vol. 15 ›› Issue (3) : 496-503. DOI: 10.1007/s11465-019-0582-6
RESEARCH ARTICLE
RESEARCH ARTICLE

Influence of direct electric current on wetting behavior during brazing

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Abstract

The wetting behavior of liquid metals is of great importance for many processes. For brazing, however, a targeted modification beyond the adjustment of conventional process parameters or the actual set-up was not possible in the past. Therefore, the effect of direct electric current along the surface of a steel substrate on the wetting behavior and the formation of the spreading pattern of an industrial nickel-based filler metal was investigated at a temperature above T = 1000 °C in a vacuum brazing furnace. By applying direct current up to I = 60 A the wetted surface area could be increased and the spreading of the molten filler metal could be controlled in dependence of the polarity of the electric current. The electric component of the Lorentz force is supposed to be feasible reasons for the observed dependence of the electrical polarity on the filler metal spreading direction. To evaluate the influence of the electric current on the phase formation subsequent selective electron microscope analyses of the spreading pattern were carried out.

Keywords

brazing / electric current assisted wetting / Lorentz force

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Kirsten BOBZIN, Wolfgang WIETHEGER, Julian HEBING, Lidong ZHAO, Alexander SCHMIDT, Riza ISKANDAR, Joachim MAYER. Influence of direct electric current on wetting behavior during brazing. Front. Mech. Eng., 2020, 15(3): 496‒503 https://doi.org/10.1007/s11465-019-0582-6

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Acknowledgements

The presented investigations were carried out at RWTH Aachen University within the framework of the Collaborative Research Centre SFB1120-236616214 “Precision Melt Engineering” and funded by the German Research Foundation (DFG e.V.). The sponsorship and support is gratefully acknowledged. Open access funding provided by Projekt DEAL.

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2020 The Author(s) 2020. This article is published with open access at link.springer.com and journal.hep.com.cn
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