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7203 |
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Wednesday, June 22, 2022, Saal Brüssel 11:40 AM Industrial application of brazing and diffusion bonding |
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Flux-free joining of dissimilar materials |
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Lukas Wojarski* / TU Dortmund University, Germany Wolfgang Tillmann / Dortmund University of Technology, Germany Henrik Ulitzka/ TU Dortmund University / Institute of Materials Engineering, Germany Ino Rass/ Euromat GmbH, Germany |
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Continuously rising regulations regarding the application of chemical agents that are suspected of being toxic or harmful to the environment, lead to the demand for safe and clean processes. In this regard, the abandonment of the use of fluxes not only leads to less contamination but can also be economically advantageous due to the elimination of storage and disposal costs as well as the saving of post-processing steps for the removal of the flux residues, which can feature a corrosive effect. Besides vacuum brazing, in which the vacuum atmosphere can prevent a re-oxidation of the faying surfaces or even cause a reduction of surface oxides, ultrasonic-assisted soldering resp. brazing in ambient atmosphere is a cost-effective flux-free alternative joining process. Due to the introduction of ultrasound during the isothermal hold at joining temperature, cavitation processes are initiated in the molten filler alloy, which are capable to destroy the surface oxides at the faying surfaces in situ without the need for additional chemical substances. This manuscript demonstrates the high potential of ultrasonic-assisted induction joining for the production of dissimilar material composites. In addition to possible areas of application, the different microstructures and the achievable strengths are shown. |