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Influence of direct electric current on wetting behavior during brazing |
Kirsten BOBZIN1, Wolfgang WIETHEGER1, Julian HEBING1, Lidong ZHAO1, Alexander SCHMIDT1( ), Riza ISKANDAR2, Joachim MAYER2 |
1. Surface Engineering Institute (IOT), RWTH Aachen University, 52072 Aachen, Germany 2. Central Facility for Electron Microscopy, RWTH Aachen University, 52074 Aachen, Germany |
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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.
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Keywords
brazing
electric current assisted wetting
Lorentz force
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Corresponding Author(s):
Alexander SCHMIDT
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Just Accepted Date: 16 April 2020
Online First Date: 14 May 2020
Issue Date: 03 September 2020
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