Abstract
Lightweight construction materials, in particular aluminum alloys, have recently become more important as construction materials due to their low weight with high strength and sufficient wear and corrosion properties. In order to be able to use the advantages resulting from the use of aluminum alloys, powerful and reliable thermal joining methods are required which reduce the heat input into the component and thus the distortion and change the set structure as less as possible. New approach here is the NV-EB brazing at low acceleration voltage. In particular, two aspects must be solved for process-reliable brazing of aluminum alloys. On the one hand, the oxide layer on the surface of the aluminum workpiece must be removed. On the other hand, sufficient heat must be put into the solder and base material in order to both melt the solder and to heat the base material sufficiently, but below the solidus temperature. Often the “Nocolok” potassium tetrafluoroaluminate flux is used. In addition, the harmful to health cesium fluoroaluminate and mixtures of both fluxes are used. Apart from health aspects, the use of fluxes has led to increased pollution of an equipment and corrosion, which contributes to process instability. By reason of described above, the investigation of a fluxless brazing of aluminum alloys using non vacuum electron beam by 60kV acceleration voltage is of great interest.
Highlights
At the Institute of Material Science of the Leibniz Universität Hannover, systematic studies are conducted to study the potential of a non-vacuum electron beam with an accelerating voltage of 60 kV
Apart from health aspects, the use of fluxes has led to increased pollution of an equipment and corrosion, which contributes to process instability
By reason of described above, the investigation of a fluxless brazing of aluminum alloys using non vacuum electron beam by 60kV acceleration voltage is of great interest
Summary
Published under licence by IOP Publishing Ltd oxide layer of the base material is removed and the aluminum surface can be wetted by the solder [1]. It was investigated the possibility of using an AC welding source for flux-free brazing of aluminum alloys with specially designed aluminum solder [1]. This material combination enables low processing temperatures of up to 524 ° C in order to provide the largest possible process window for the soldering process These materials have only a low formability in the alloyed state and can hardly be processed as solid wire. Brazing experiments with an accelerating voltage 60kV were conducted on an adapted NVEB system
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