Transactions of Materials and Heat Treatment

Title：Simulation study on welding quality and transverse weld of 6XXX series aluminum alloy during porthole die extrusion

Authors： Wang Zhaohe1 Gao Wenlin2 Wang Jicheng2 Liu Zhongqiu1 Li Baokuan1

Unit： 1.School of Metallurgy Northeastern University Shenyang 110819 China 2.Hexing Aeronautical Materials (Tianjin) Technology Co. Ltd. Tianjin 300300 China

KeyWords： 6XXX series aluminum alloy porthole die extrusion welding quality transverse weld parameters of extrusion process flow dead zone

ClassificationCode：TG376

year,vol(issue):pagenumber：2025,50(5):155-164

Abstract：

The porthole die extrusion process for 6XXX series aluminum alloy collector tube was simulated, and the accuracy of the model was validated by the distribution of transverse welds on different sections of the actual extruded profiles. Then, the influences of extrusion speed and extrusion temperature on metal flow velocity, temperature distribution, extrusion force required for the extrusion process, welding quality and transverse weld length were analyzed. The results indicate that increasing the extrusion speed can improve the production efficiency of profiles. However, when the extrusion speed exceeds 1.2 m·min-1, the welding quality decreases, and when the extrusion speed is 1.5 m·min-1, the local temperature of profiles exceeds the limit. When the extrusion temperature is elevated from 480 ℃ to 520 ℃, the peak extrusion force decreases from 17.08 MN to 15.17 MN, but the bonding performance of the welding interface deteriorates. Furthermore, the length of the transverse weld is mainly affected by the distribution of the material flow velocity, while the extrusion temperature has a less significant effect on the evolution of welds. At a high extrusion speed of 1.5 m·min-1, the flow dead zone decreases from 19.4% at an extrusion speed of 0.6 m·min-1 to 13.9%, which shortens the welds by 26.5%.

Funds：

辽宁省兴辽人才-青年拔尖人才项目（XLYC2203064）;辽宁省优秀青年基金资助项目（2023JH3/10200001）

作者简介：王昭河（1999-），男，硕士研究生，E-mail：2271902@stu.neu.edu.cn；通信作者：刘中秋（1986-），男，博士，教授，E-mail：liuzq@smm.neu.edu.cn

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