铝合金搅拌摩擦焊-交叉点焊工艺

周冠男; 沈以赴; 李博; 姚磊; 胡伟叶

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铝合金搅拌摩擦焊-交叉点焊工艺
周冠男¹, 沈以赴¹, 李博¹, 姚磊¹, 胡伟叶²
1.南京航空航天大学材料科学与技术学院, 南京 210016;2.中国航天科工集团南京晨光厂工艺研究所, 南京 210012

摘要:

在铝合金传统搅拌摩擦点焊的基础上,以提高点焊接头力学性能为目标,提出"搅拌摩擦焊-交叉点焊"技术.其基本工艺原理是,搅拌头沿交叉轨迹做极短距离的往复式搅拌摩擦焊,以实现高性能的点焊连接.对4mm板厚5A02-H14铝合金进行"搅拌摩擦焊-交叉点焊"试验及分析.结果表明,该工艺可大大拓宽点焊接头的连接面积,并显著降低搭接界面畸变和匙孔处材料缺失的不利影响,与传统搅拌摩擦点焊相比,该工艺能够显著提高铝合金点焊接头的抗剪切性能.

关键词: 交叉点焊搅拌摩擦焊铝合金力学性能

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基金项目:南京航空航天大学博士学位论文创新与创优基金资助项目(BCXJ12-09);中央高校基本科研业务费专项资金资助项目

A cross-friction stir spot welding process of aluminum alloy

ZHOU Guannan¹, SHEN Yifu¹, LI Bo¹, YAO Lei¹, WU Xiaowei²

1.College of Materials Science and Technology, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China;2.Technology Research Institute of Nanjing Chenguang Group Co., Ltd(NCGC), China Aerospace Science and Industry Corporation(CASTC), Nanjing 210006, China

Abstract:

A new technique of cross-friction stir spot welding (cross-FSSW) was proposed for improving the mechanical properties of the spot weld joints. This technology was realized by the tool made the short cross-reciprocating movement. Using this technique,experiments were conducted in 4 mm thick sheets of aluminum alloy 5A02 in H14 condition. The results show that the bonding widths of cross-FSSW joints had been increased, the adverse effects of interface distortion and the lack of material of the keyhole had been avoided. cross-FSSW joints were found to be superior to traditional Friction stir spot welds produced under optimum conditions in lap-shear.

Key words: cross-friction stir spot welding friction stir welding aluminum alloy mechanical properties