电焊机2024，Vol.54Issue(2)：70-76,7.DOI:10.7512/j.issn.1001-2303.2024.02.11
低合金高强钢螺纹孔摩擦塞补焊修复接头的组织与性能研究
Microstructure and Mechanical Properties of Friction Plug Repair Welding Joint on Low Alloy High Strength Steel Threaded Hole
祝弘滨 1何宾 2李晓华 3武媛 3崔雷2
作者信息
- 1. 中车工业研究院有限公司,北京 100161
- 2. 天津大学 材料科学与工程学院,天津 300072||天津大学 天津市现代连接技术重点实验室,天津 300072
- 3. 中车永济电机有限公司,山西 永济 044500
- 折叠
摘要
Abstract
In this paper,the friction plug repair welding process and mechanical properties for the threaded hole on rail ve-hicle part were studied.The defect-free repair welding joints with optimized geometries of the plug/hole and welding pa-rameters were obtained,and their microstructure,tensile properties,impact toughness and fatigue properties were analyzed.The results showed that incomplete penetration occurred in the bonding interface at high axial force.The defect-free joints were obtained with a rotation speed of 7 000 r/min,axial force 35 kN,thrust force 40 kN,and the plug feeding 18 mm.The microstructure near the bonding interface consists of pearlite,ferrite and some lath bainite,at the nugget zone is acicular fer-rite,a large amount of grain boundary ferrite and a small amount of lath bainite.The defect-free joint has excellent mechani-cal properties,the tensile properties are equivalent to that of base metal,the fracture position of the joints are all located in the base metal at room temperature tensile test.In the fatigue test,the external thread of bolt always cracked precedes that of the internal thread of repair thread hole,The five million cycles fatigue strength of repair thread by plug welding reaches 142 MPa.关键词
低合金高强钢/螺纹孔/摩擦塞补焊/微观组织/力学性能Key words
low alloy high strength steel/threaded hole/friction plug repair welding/microstructure/mechanical properties分类
矿业与冶金引用本文复制引用
祝弘滨,何宾,李晓华,武媛,崔雷..低合金高强钢螺纹孔摩擦塞补焊修复接头的组织与性能研究[J].电焊机,2024,54(2):70-76,7.
