搅拌头旋转频率对静止轴肩搅拌摩擦焊接头力学性能的影响规律

发布时间：2018-04-21 08:38

本文选题：静止轴肩搅拌摩擦焊 + 力学性能　；参考：《焊接学报》2015年01期

【摘要】：利用自行设计的静止轴肩装置对6005A-T6铝合金进行了静止轴肩搅拌摩擦焊的试验研究.结果表明,当焊接速度为200 mm/min时,表面光滑且无缺陷的焊接接头抗拉强度与断后伸长率随着搅拌头旋转频率的增加呈现先增加后减小的趋势;焊接接头的正背弯180°无裂纹;当旋转频率为1 800 r/min时,抗拉强度达到最大值234MPa,接头强度系数达到79%.静止轴肩搅拌摩擦焊接头的显微维氏硬度呈W形分布,最小值出现在前进侧的热影响区;接头的软化程度随搅拌头旋转频率的增加而增加.焊接接头的断裂位置位于热力影响区,断口呈韧性断裂.
[Abstract]:The static shaft-shoulder friction stir welding (FSW) of 6005A-T6 aluminum alloy was studied by using a static shaft-shoulder device designed by ourselves. The results show that when the welding speed is 200 mm/min, the tensile strength and post-break elongation of the welded joints with smooth surface and no defects increase first and then decrease with the increase of the rotating frequency of the mixing head, and the positive back bending of the welded joints is not cracked at 180 掳. When the rotation frequency is 1 800 r/min, the tensile strength reaches the maximum value of 234 MPA, and the strength coefficient of the joint reaches 79 MPA. The micro-Vickers hardness of the static shaft-shoulder friction stir welding joint is W-shaped, and the minimum value appears in the heat affected zone of the forward side, and the softening degree of the joint increases with the increase of the rotating frequency of the stir head. The fracture location of the welded joint is located in the thermal affected zone, and the fracture surface is ductile fracture.
【作者单位】：沈阳航空航天大学航空航天工程学部;哈尔滨工业大学先进焊接与连接国家重点实验室;南车青岛四方机车车辆股份有限公司;
【基金】：国家自然科学基金资助项目(51204111) 航空科学基金资助项目(2013ZE54021,2014ZE54021) 先进焊接与连接国家重点实验室基金资助项目(AWJ-M13-07)
【分类号】：TG453.9

【参考文献】