摘要
采用SSFSW技术成功实现了7050-T7451高强铝合金的焊接。对该接头的外观形貌、显微组织、硬度分布及力学性能分别进行了试验研究。结果表明,与常规FSW相比,SSFSW的接头成形美观,表面光滑,焊缝无减薄现象;焊缝组织结构也有明显的不同,热影响区范围明显窄小,前进侧TMAZ只有60μm;接头硬度呈典型的"W"形分布,最低硬度出现在靠近焊核的热影响区附近,显微硬度为128 HV;接头的抗拉强度为487 MPa,达到了母材的91%,力学性能良好。断裂发生在热影响区,为微孔聚集型断裂。
7050-T7451 aluminum alloy joint was successfully obtained by stationary shoulder friction stir welding(SSFSW).Weld appearance,microstructures,hardness profiles and tensile properties of the joint were measured and studied.The results show that the joint by SSFSW process has good and smooth appearance,and there is little reduction in the weld thickness.Compared with the conventional FSW,the microstructures of SSFSW joint was also significantly different.The thermomechanically affected zone is quite narrow,whose width on the advancing side is only 60μm.The hardness profiles of joint presents“W”shape,the lowest hardness occurs in the heat affected zone near the weld nugget,the microhardness is 128 HV.The tensile strength of the joint is 486.8 MPa,which reaches up to 92%of the base metal.The fracture occurs in the heat affected zone,which is a typical ductile fracture.
作者
张华
赵常宇
林三宝
石功奇
Zhang Hua;Zhao Changyu;Lin Sanbao;Shi Gongqi(School of Mechanical Engineering,Beijing Institute of Petrochemical Technology,Beijing 102617,China;State Key Laboratory of Advanced Welding and Joining,Harbin Institute of Technology,Harbin 150001,China;The Welding Institute,Cambridge,UK)
出处
《焊接》
2018年第9期5-9,65,共6页
Welding & Joining
基金
先进焊接与连接国家重点实验室开放课题基金资助项目(AWJ-16-Z01)
关键词
静轴肩搅拌摩擦焊
7050铝合金
显微组织
力学性能
stationary shoulder friction stir welding
7050 aluminum alloy
microstructure
tensile property
