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Influence of direct electric current on wetting behavior during brazing
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作者 Kirsten BOBZIN Wolfgang WIETHEGER +4 位作者 julian hebing Lidong ZHAO Alexander SCHMIDT Riza ISKANDAR Joachim MAYER 《Frontiers of Mechanical Engineering》 SCIE CSCD 2020年第3期496-503,共8页
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 poss... 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. 展开更多
关键词 BRAZING electric current assisted wetting Lorentz force
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