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Al-Li alloy is considered to be an ideal structural material for aerospace vehicles because of its fight weight, high strength and other excellent qualities.However, the low welding performance of Al-Li alloy limits its wide application in aeronautics and astronautics fields.Friction spot welding (FSpW), as one kind of solid-state welding, can significantly improve the mechanical properties of Al-Li alloy joint, compared with conventional melting welding.