2219 aluminum alloy, American deformed aluminum and aluminum alloy. 2219 aluminum alloy has poor corrosion resistance and good machining performance; poor brazing properties, easy to arc welding and spot welding. Suitable for structural parts and high-strength welding parts that work at a high temperature of 315°C.
Due to its high strength and low density, 2219 aluminum alloy has become one of the most important lightweight structural materials in the aerospace field, and is called "aviation aluminum". At present,
2219 aluminum alloy plate has been widely used in thin-walled components such as fuel tanks, launch vehicle cabins, aircraft wall panels, and high-speed rail bodies in the aerospace field. Among them, high-quality connection technology for medium and large aluminum alloy structural parts is required. Urgently, in the current mainstream connection technology, welding, as an important connection technology, has the advantages of being able to achieve metallurgical bonding at the connection and less restriction on the types of applicable connection materials.
With the rapid development of the aerospace industry and the rapid progress of materials, the design of large-scale launch vehicle tanks urgently requires materials with high strength, excellent welding performance, and low stress corrosion sensitivity. At the same time, the materials are required to be at the low temperature of liquid hydrogen and liquid oxygen. There is no low temperature brittleness, and the effective load is improved. The tank material of the current carrier rocket model is mainly 2A14 aluminum alloy, but its welding process is complicated, the weld is brittle, and it is sensitive to stress concentration. During storage, the welding crack hidden under the surface of the base material may be delayed. Improve the production efficiency of the launch vehicle tank and the reliability of the product quality. 2219 aluminum alloy is an Al-Cu-Mg series alloy, which can be heat-treated and strengthened. It has been widely used in foreign carrier rockets. The flaps and wall panels of the new generation of domestic carrier rockets are all made of
2219 aluminum alloy plate,
2219 aluminum Alloy plate has obvious advantages in low and high temperature mechanical properties, fracture toughness, welding performance and stress corrosion resistance, etc., especially good welding performance.
(1) The orientation of the sample has different effects on the yield strength and tensile strength of the annealed sheet and the quenched sheet: in the annealed state, the strength parallel to the rolling direction is higher; while in the quenched state, it is often perpendicular to the The performance in the rolling direction is higher.
(2) Heat treatment has a significant effect on the performance of the sheet. The yield strength, elongation and anisotropy coefficient of the quenched sheet are slightly higher than those of the annealed sheet. The tensile strength and strain hardening index of the quenched sheet are those of the annealed sheet. More than 2 times, the quenched sheet has better toughness compared with the annealed sheet, and the uniform plastic deformation ability of the quenched sheet is improved.
