Analysis of process parameters effects on friction stir welding of dissimilar aluminum alloy to advanced high strength steel |
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| Affiliation: | 1. Department of Materials Science and Engineering, Sharif University of Technology, P.O. Box 11365-9466, Azadi Ave., Tehran, Iran;2. Institute of Condensed Matter Physics (ICMP), EPFL, CH-1015 Lausanne, Switzerland;3. McGill University, Department of Materials Engineering, Montreal, QC H3A 2B2, Canada;4. Department of Mechanical Engineering, National Taiwan University of Science and Technology, Taipei 10607, Taiwan, ROC |
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| Abstract: | Thin sheets of aluminum alloy 6061-T6 and one type of Advanced high strength steel, transformation induced plasticity (TRIP) steel have been successfully butt joined using friction stir welding (FSW) technique. The maximum ultimate tensile strength can reach 85% of the base aluminum alloy. Intermetallic compound (IMC) layer of FeAl or Fe3Al with thickness of less than 1 μm was formed at the Al–Fe interface in the advancing side, which can actually contribute to the joint strength. Tensile tests and scanning electron microscopy (SEM) results indicate that the weld nugget can be considered as aluminum matrix composite, which is enhanced by dispersed sheared-off steel fragments encompassed by a thin intermetallic layer or simply intermetallic particles. Effects of process parameters on the joint microstructure evolution were analyzed based on mechanical welding force and temperature that have been measured during the welding process. |
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| Keywords: | Friction stir welding Dissimilar aluminum/high strength steel Process parameters Intermetallic compound Tensile strength |
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