Abstract
One of the main directions for reducing the weight of structures of aerospace engineering products is the use of aluminum-lithium alloys, which have unique characteristics of strength, rigidity and fracture toughness [1–3]. Nevertheless, the manufacture of large-sized welded structures from high-strength aluminum-lithium alloys is associated with serious problems due to their softening under the influence of the thermal cycle of fusion welding, for which the joint strength coefficient (the ratio of the weld strength to the strength of the base material) is below 60% [4, 5]… It is possible to increase the operational characteristics of welded joints through the use of new effective technological processes, such as friction stir welding (FWW) [6].
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