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Ultrasound enhanced friction stir welding of aluminum and steel: Process and properties of EN AW 6061/DC04-Joints

: Thomä, Marco; Wagner, Guntram; Straß, Benjamin; Wolter, Bernd; Benfer, Sigrid; Fürbeth, Wolfram


Journal of materials science & technology : JMST 34 (2018), No.1, pp.163-172
ISSN: 1005-0302
ISSN: 1000-3029
Deutsche Forschungsgemeinschaft DFG
Joining by plastic deformation; DFG Priority Program 1640
Journal Article
Fraunhofer IZFP ()
friction stir welding; ultrasound enhancement; dissimilar joints; corrosion

In this work, the joining of aluminum to steel was conducted by ultrasound enhanced friction stir welding (USE-FSW). The power ultrasound was introduced into one of the metal sheets by an ultrasonic roll seam module synchronously to the FSW-process. The effect of the ultrasound on the resulting welds, their microstructure and their corrosion properties was investigated by light and scanning electron microscopy and corrosion investigations. The USE-FSW-joints showed less and smaller steel particles in the nugget zone as well as a thinner continuous intermetallic phase of FeAl3 at the interface. The nondestructive testing method of computed laminography proved the observations made by optic microscopy due to non-porous joints for both techniques. Corrosion investigations showed only low corrosion current densities and no enhanced galvanic corrosion for the EN AW-6061/DC04-hybrid joints in sodium chloride solution.