Microstructural characterization of dissimilar friction stir welds between AA2219 and AA5083 |
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Authors: | J J S Dilip M Koilraj V Sundareswaran G D Janaki Ram S R Koteswara Rao |
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Affiliation: | (1) Department of Materials Science and Engineering, Sharif University of Technology, Azadi Ave., Tehran, Iran; |
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Abstract: | Fusion welding of dissimilar aluminum alloys is very challenging. In the present work, Al-Cu alloy AA2219-T87 was friction
stir welded to Al-Mg alloy AA5083-H321. Weld microstructures, hardness, and tensile properties were evaluated in as-welded
condition. Microstructural studies revealed that the nugget region was primarily composed of alloy 2219, which was placed
on the advancing side. No significant mixing of the two base materials in the nugget region was observed. Hardness studies
revealed that the lowest hardness in the weldment occurred in the heat-affected zone on alloy 5083 side, where tensile failure
were observed to take place. Tensile tests indicated a joint efficiency of around 90%, which is substantially higher than
what can be achieved with conventional fusion welding. Overall, the results show that satisfactory butt welds can be produced
between AA2219-T87 and Al-Mg alloy AA5083-H321 sheets using friction stir welding. |
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