Transactions of Materials and Heat Treatment

Title：Joining law of local bulging and extrusion at ultra-low temperature of thin-walled tube and flange composite joint for 6061 aluminum alloy

Authors： Cheng Wangjun1 Zhang Hengyuan1 Liu Wei2 Gao Qiang1 Sun Yaoning1

Unit： 1.School of Mechanical Engineering Xinjiang University 2. National Key Laboratory for Precision Hot Processing of Metals Harbin Institute of Technology

KeyWords： local extrusion at ultra-low temperature plastic joining thin-walled tube thin-walled flange bulging load

ClassificationCode：TG376.9

year,vol(issue):pagenumber：2023,48(5):25-30

Abstract：

To solve the efficient joining problem of the thin-walled tube and thin-walled flange complex structure for aluminum alloy, a novel plastic joining method of local extrusion at ultra-low temperature for thin-walled tube and thin-walled flange for aluminum alloy was proposed. The plastic jointing dies used in radial bulging and axial compression sealing at ultra-low temperature were designed. The effect laws of middle sealing layer and bulging load on the wall thickness distribution and the damage factor of the joining part after the radial bulging and axial compression sealing for aluminum tube-plastic-flange joining part at room temperature and ultra-low temperature (-196 ℃) were analyzed by numerical simulation. The results show that the larger the bulging load is, the more the convex amount of the axial compression sealing is, and the higher the need of material plasticity is. Likewise, the thinning of materials mainly occurs in the radial bulging stage. The damage of outer flange is significantly smaller than that of the inner tube under the same condition. Meanwhile, the damage resistance of specimens at ultra-low temperature is obviously higher than that at room temperature, which effectively inhibits the fracture defects of plastic joining parts. This process plays an important reference role in the manufacturing of joining structures with high quality for thin-walled tube and thin-walled flange of aluminum alloy.

Funds：

新疆维吾尔自治区自然科学基金资助项目 (2022D01C653)；中国博士后科学基金面上资助项目 (2022M722666)；新疆维吾尔自治区“天池英才”高层次人才项目（51052300536）

作者简介：程旺军（1987-），男，博士，副教授，E-mail：chengwangjun2008@126.com

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