Thermal treatment process for improving weld structure performance of aluminum alloy battery box body

Abstract

The invention discloses a thermal treatment process for improving the weld structure performance of an aluminum alloy battery box body, which is characterized by comprising the steps of: promoting a solid solution strengthening phase in an alloy to separate out through first high-temperature short ageing from an ageing control process, wherein an extruded section online solid solution treatment process is as follows: the section mold stripping hole temperature is 520-540 DEG C, online air cooling and quenching are carried out, and a high-temperature ageing process is carried out at a temperature of 195-205 DEG C for 1.5-2 hours; secondly, under the cooling condition provided by a welding procedure special tool, enabling a weld structure to generate different levels of secondary solid solution quenching effects; and finally, carrying out low-temperature ageing treatment at a temperature of 160-170 DEG C for 5-6 hours. By adopting the technical scheme disclosed by the invention, on the basis of no reduction of strength of a base material, the structure performance level of a weld heat affected zone of an aluminum alloy extruded member can be improved.

Description

technical field [0001] The invention relates to a heat treatment process for an aluminum alloy extruded component, in particular to a heat treatment process for improving the welded structure and performance of an aluminum alloy battery case. Background technique [0002] The battery box structure of the chassis of the electric vehicle is formed by 9 sections of 6005 aluminum alloy extruded components through welding process. The fixing device is placed in the battery case of aluminum alloy welding structure. For a precipitation-strengthened aluminum alloy with a certain composition, the properties, distribution and evolution of the precipitated phase caused by the welding heat transfer process have an important impact on the welding strength and state of the aluminum alloy extrusion component. Therefore, how to control the evolution of microstructure and metallurgical properties during the welding process so that it is in the best state is very important for improving the ...

AI Technical Summary

Problems solved by technology

[0005] The technical problem solved by the present invention is to propose a new heat treatment process route for the current 6005 aluminum alloy battery box frame, the welding structure and the instability of the performance of the heat-affected zone, so that the welding heat of aluminum alloy extruded components can be improved. The organization and performance of the affected area have been stabilized and improved

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