Spray formed 7055 high strength aluminum alloy welded joint with traditional aluminum alloy welding wires has low strength, only 240-260 MPa, and high brittleness, which seriously restricts the widespread application of spray formed 7055 high strength aluminum alloy. In this paper, two kinds of aluminum alloy welding wires containing TiB₂ and ZrB₂ ceramic particles were developed, and TiB₂ and ZrB₂ ceramic particles were introduced into the welded joint of the spray formed 7055 aluminum alloy by TIG welding, respectively. The results show that the microstructures of TiB₂-7055 welded joint is fine equiaxed grains, and the tensile strength of is 310 MPa, reaching 51.6% strength of the base metal. Moreover, the elongation is more than 5%, demonstrating ductile fracture. The microstructure of ZrB₂-7055 welded joint is fine dendrite, and the tensile strength is 280 MPa, reaching 46.6% strength of the base metal, showing brittle fracture. The development of this new type of welding wire containing TiB₂ ceramic particles can solve the problems of softening and low plasticity of spray formed 7055 high strength aluminum alloy fusion welded joint, and provide the basis for expanding the applications of spray formed 7055 high strength aluminum alloy in the fields requiring both lightweight and high strength.

采用传统铝合金焊丝喷涂成型的7055高强铝合金焊接接头强度低，只有240-260  MPa，且脆性大，严重制约了喷涂成型7055高强铝合金的广泛应用。本文研制了两种含TiB ₂和ZrB ₂陶瓷颗粒的铝合金焊丝，分别采用TIG焊接将TiB ₂和ZrB ₂陶瓷颗粒引入喷涂成形的7055铝合金的焊接接头中。结果表明，TiB ₂ -7055焊接接头组织为细小的等轴晶，抗拉强度为310 MPa，达到母材强度的51.6%。此外，伸长率超过 5%，显示出韧性断裂。ZrB ₂ -7055 焊接接头组织为细小枝晶，抗拉强度为280  MPa，达到母材强度的46.6%，呈脆性断裂。研制这种含TiB ₂陶瓷颗粒的新型焊丝，可以解决喷涂成型7055高强铝合金熔焊接头软化和塑性低的问题，为扩大喷涂成型7055高强铝合金的应用提供依据。合金在需要轻质和高强度的领域。