对1mm厚6061-T6铝合金进行流动摩擦点焊试验,通过测试各种工艺条件下的焊接接头剪切性能,结合金相组织观察及断裂特征分析,研究了不同工艺参数对焊接接头焊核区、热机影响区、热影响区微观组织和剪切性能的影响.结果表明:在本次试验研究范围内,随着搅拌头焊接转速和焊接时间的增加,焊接接头的剪切性能逐渐提高;当焊接转速与焊接时间确定时,焊接接头的剪切性能随下压力的逐步增加呈现先增大后减小的趋势.当下压力F≤2300N时,"Hook"缺陷未上翘至上板顶部,焊点断裂模式为"剪切"断裂;当下压力F>2300N时,"Hook"缺陷上翘至上板顶部,焊点断裂模式为"插入"断裂.当下压力F=2300N,搅拌头旋转速度为2000r/min,焊接时间为10s时,1mm厚6061-T6铝合金流动摩擦点焊接头剪切性能和成型质量较好.%The friction flow spot welding experiment has been performed on 1mm thick aluminum alloy 6061-T6. The process, microstructure and properties of welded joints were analyzed. The results show that the welded joints can be divided into four regions namely weld nugget zone, thermo-mechanical affected zone, heat affected zone and base mate-rial zone. The weld nugget zone has the tiniest grains. Down force, welding rotational speed and welding time have influ-ences on the properties of the welded joints. In this paper, the author selects down force as the parameter for controlling the plunge depth of the tool. When down force≤2300N, the hooking defeat hasn't inserted into the top surface of the upper sheet, the fracture mode acts as the "shear fracture". When down force > 2300N, the fracture mode acts as the "plug frac-ture". The study shows that when choosing down force 2300N, welding rotational speed 2000r/min, welding time 10s as the welding parameter, good weld joints of 1mm thick aluminum alloy 6061-T6 can be got.
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