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7020 |
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Wednesday, May 05, 2021, Hall 1 11:45 AM Research and Development |
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Flux-free approaches for brazing aluminum alloys |
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Lukas Wojarski* / TU Dortmund University, Germany Henrik Ulitzka / Technische Universität Dortmund / Lehrstuhl für Werkstofftechnologie, Deutschland Ino J. Rass/ Euromat GmbH, Deutschland Wolfgang Tillmann/ Technische Universität Dortmund / Lehrstuhl für Werkstofftechnologiev, Deutschland |
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Aluminum alloys are the most frequently applied lightweight construction materials, which are commonly used in numerous fields of applications like automotive and aviation sector as well as electronic components and heat exchangers. In order to exploit the full potential of these materials, adequate joining techniques are desired, which enable high strength and thermal as well as electrical conductivity and at the same time matches the rising environmental constraints. In this regard, solely flux-free thermal joining processes like welding or brazing are capable to meet these stringent demands. Within this publication, the potential of different brazing techniques was investigated to produce high strength aluminum joints without the application of any fluxes. Joints were either produced by vacuum brazing or by ultrasonic-assisted induction brazing. The joint microstructures were characterized by using SEM analysis and EDS measurements as well micro hardness testing in order to determine the effect of the brazing parameters on the phases formed in the brazing seam. Additionally, the joint strength was measured in single lap shear tension testing and the fractured samples were examined in order to locate the fracture path. |