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2198 Al-Li alloy welds were performed by friction stir welding (FSW) to investigate the influence of the ratio of rotation speed to welding speed (v/n) on joint microstructure, microhardness, and tensile properties. Transmission electron microscopy (TEM) was used to reveal the precipitate type across the weld cross-section. Results show that v/n has a little impact on both macroscopic morphology and microstructure of joints. Dissolution of precipitates has occurred in the weld nugget (WN). The density of T 1 phase and its size in the WN decrease remarkably. Changes to the T 1 phase are linked to a significant reduction in microhardness across the weld. With increasing v/n the microhardness of the joints decreases. The value of v/n also has impact on the fracture mode of the joints as well as the elongation.

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