|About this Abstract
||2017 TMS Annual Meeting & Exhibition
||Friction Stir Welding and Processing IX
||Realization of Ultrasound Enhanced Friction Stir Welded (USE-FSW) Al/Mg- and Al/Steel-Joints: Process and Robustness, Mechanical and Corrosive Properties
||Marco Thomae, Guntram Bernhard Wagner, Benjamin Strass, Bernd Wolter, Sigrid Benfer, Wolfram Fuerbeth
|On-Site Speaker (Planned)
As an innovative hybrid joining process USE-FSW was successful applied on Al/Mg-Joints and offers a beneficial impact on the resulting microstructure and mechanical properties. The always during the conventional FSW-process developing continuous Al<SUB>3</SUB>Mg<SUB>2</SUB> and Al<SUB>12</SUB>Mg<SUB>17</SUB> intermetallic layers can be avoided by USE-FSW as a result of the into the joining area transferred ultrasound power energy. In this case the intermetallic phases are spread over the complete Nugget area. Consequently the tensile strength increases 25 % and the fatigue strength rises 3.5 times. Based on this USE-FSW was investigated with regard to possible advantages for Al/Steel-Hybrid-Joints. Pre-investigations have shown significant differences in the microstructure of ultrasound enhanced and non-ultrasound enhanced EN AW-6061/DC04-Joints. While conventional FSW led to hooks and large particles of steel in the aluminum, the USE-FSW-Joints show remarkably smaller and more homogenous distributed steel particles in the Nugget. Beside mechanical investigations non-destructive and corrosive tests are carried out.
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