Welding wire used for Al-Cu-Li system aluminum lithium alloy and Al-Cu system aluminum alloy

Abstract

The invention discloses a welding wire used for an Al-Cu-Li system aluminum lithium alloy and an Al-Cu system aluminum alloy. The welding wire is prepared from, by mass percentage, 4.60% of Cu, 0.35% to 1.00% of Sc, 0.30% to 0.60% of Mn, smaller than or equal to 0.10% of Zn, smaller than or equal to 0.05% of Mg, smaller than or equal to 0.06% of Si, smaller than or equal to 0.15% of Fe, smaller than or equal to 0.15% of other impurities and the balance Al, wherein the mass percentage of each kind of the impurities is smaller than or equal to 0.05%. When the Al-Cu-Sc system welding wire is used for fusion welding of the Al-Cu-Li system aluminum lithium alloy and the Al-Cu system aluminum alloy, the structure of a welding joint is fine, the crack resistance is good, and the comprehensive mechanical properties of a connector are good.

Description

technical field [0001] The invention relates to a welding material, in particular to a welding wire used for Al-Cu-Li series aluminum-lithium alloy and Al-Cu series aluminum alloy. Background technique [0002] Due to their lower density, higher specific strength and specific stiffness, Al-Li alloys have gained attention in fields such as aerospace. In recent years, the third-generation Al-Cu-Li-X alloy developed by appropriately reducing the Li content, increasing the Cu content and adding multiple alloying elements has excellent comprehensive properties such as excellent damage resistance and fracture toughness, among which Some alloys have been applied in the aerospace field. In order to further reduce the weight of the structure, replacing riveting with welding has become an important trend in the application of high-performance aluminum-lithium alloys. Due to the characteristics of easy operation, process practicability, strong applicability and low cost, the fusion w...

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Problems solved by technology

[0004] It is reported that when welding Al-Cu-Li alloys, the existing Al-Mg welding wires (5556, 5654) or Al-Cu welding wires (2319, 2325) are mostly used, and the former can improve the corrosion resistance of the weld. and fracture toughness, but the weld strength and formability are poor. The latter can improve the strength and formability of the weld, but it is easy to form hot cracks

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