Electron beam welding method suitable for injection-molded 7000-series aluminum alloy

Abstract

The invention discloses an electron beam welding method suitable for an injection-molded 7000-series aluminum alloy. In the method, electron beam welding is performed on the injection-molded 7000-series aluminum alloy by adopting the process parameters of welding current of 18-22mA, voltage of 70-75kV, welding speed of 280-320 mm / min and scanning frequency of 1.8-2.4Hz to obtain a good weld seam. The method has the advantages that: a good weld seam structure can be obtained for the injection-molded 7000-series aluminum alloy treated with the method, and no welding air hole, structural boundary line or remarkable coarse crystal strip exists. The intensity of a weld assembly can be enhanced by performing subsequent solid solution and aging treatment.

Description

technical field [0001] The invention relates to an electron beam welding method suitable for spray forming 7000 series aluminum alloys. Background technique [0002] As a widely used structural material, aluminum alloy should not only have high specific strength, specific modulus, fracture toughness, fatigue strength and corrosion resistance stability, but also have good forming process and good weldability. The 7000 series aluminum alloys are age-strengthened aluminum alloys. The spray-formed Al-Zn-Mg-Cu alloy is famous for its ultra-high strength. At present, many universities and research institutions at home and abroad have launched research on the microstructure, properties, processing technology and heat treatment system of the spray-formed Al-Zn-Mg-Cu alloy. Research. In order to make the material practically applied and popularized, the welding performance of the material is also one of the very important factors. [0003] Electron beam welding refers to a welding...

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Problems solved by technology

At the same time, due to the different temperature and cooling rate in each region during the welding process, regions with different structures are formed. There are certain interfaces in these regions, which also become weak interfaces in the process of tensile loading of welded joints, and other defects such as welding pores together, resulting in rapid cracking of the welded joint

[0006] When using traditional ingot metallurgy and deformation processing to produce 7000 series aluminum alloys, the total content of main alloying elements in the alloy is generally controlled at a maximum of 12%-13%, which limits the ultimate tensile strength of 7000 series aluminum alloys

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