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Friction stir welding (FSW) was investigated as a method for joining dissimilar-aluminum alloys 5182-O, 5754-O, and 6022-T4. These alloys are used in automotive applications in which parts consisting of dissimilar welded combinations of these alloys may be of interest. This study focuses on the formability of friction-stir-welded, dissimilar-alloy pairs of essentially the same gage, in order to investigate the mechanical properties that can be obtained using this approach. Testing showed that the properties of welded 5182/5754 alloy pairs retained reasonably good formability compared to base material performance. However, the 5182/6022 and 5754/6022 alloy pairs had significantly reduced formability compared to the base material properties, with failures occurring in the heat-affected zone (HAZ) of the 6022 or in the weld nugget itself. However, this level of formability was not much worse than that of …