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

A technology of microstructure and properties of aluminum alloy, applied in the field of heat treatment process of aluminum alloy extrusion components, can solve the problems of welding microstructure and performance instability of heat-affected zone, so as to improve the microstructure and properties of aluminum alloy, reduce manufacturing cost and improve product quality and productivity effects

Active Publication Date: 2012-02-08
天津锐新昌科技股份有限公司
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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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  • Thermal treatment process for improving weld structure performance of aluminum alloy battery box body

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Embodiment 1

[0021] Taking 6005 aluminum alloy extrusion profile as an example, its chemical composition is Al-0.50Mg-0.78Si-0.14Fe (mass percentage). Extrude the above-mentioned 6005 aluminum alloy extruded round ingot after preheating in the heating furnace. The temperature of the extruded profile exit die is 530°C, and it is simultaneously subjected to online forced air cooling and quenching. The temperature of the extruded profile entering the quenching zone is not lower than 460°C. , The cooling rate is above 60°C / min, and the first-time solid solution quenching treatment on the extrusion line is completed. The aluminum alloy extruded member cut to the specified length on-line is subjected to short-term aging at high temperature: 200°C / 1.5 hours.

[0022] The welding process of aluminum alloy extruded components adopts the automatic MIG welding method of welding robots. The welding conditions are: welding voltage 21V, welding current 180A, welding speed 800mm / min, welding thickness 5m...

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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 ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22F1/043
Inventor 刘惠群
Owner 天津锐新昌科技股份有限公司
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