电焊机2025，Vol.55Issue(3)：40-47,8.DOI:10.7512/j.issn.1001-2303.2025.03.05
工具形貌对微型搅拌摩擦焊塑性金属流动及焊缝力学性能的影响
Effect of Tool Morphology on Plastic Metal Flow and Weld Mechanical Properties in Micro-friction Stir Welding
摘要
Abstract
In the process of Micro Friction Stir Welding(μFSW),the drastic reduction of the size of the stirring tool will cause insufficient heat generation and poor plastic metal flow,resulting in poor surface forming and internal defects such as holes and tunnels.Therefore,the shaft shoulder of mixing tools is widely used to increase the flow of plastic metal by adding spiral structure.The concave shape of the shaft shoulder provides a space for the flow of plastic metal,and the increase of the contact area between the tool and the material can also increase the friction heat production.In view of this,this paper de-signed two kinds of stirring tools with three-helix shape of shaft shoulder(type I)and concave three-helix(type Ⅱ),and con-ducted a comparative experiment of ultra-thin plate friction stir welding on 7075-T6 aluminum alloy with a plate thickness of 0.5mm.The collection of temperature,transverse force and axial force electrical signals in the welding process,the obser-vation of the microscopic microstructure of the welded joint and the testing and analysis of mechanical properties show that the peak temperature of the welding process of the type Ⅱ tool is 6%higher than that of the type I tool,the flow behavior of the plastic metal changes from horizontal flow to internal and upward spatial flow,and the tensile strength of the mechanical properties of the joint is increased by 11%.The yield strength is increased by 2%,and the elongation after fracture is in-creased by 19.2%.The results show that the concave and triple helix shape of the shaft shoulder is helpful to increase the heat production,promote the flow of plastic metal and improve the mechanical properties of the joint.关键词
微型搅拌摩擦焊/超薄板/工具形貌/内凹结构/三螺线结构Key words
micro friction stir welding/ultra thin sheet substrate/tool morphology/concave structure/triple helix structure分类
金属材料引用本文复制引用
张昌青,谷怀壮,马东东,王栋,刘恩荣,张鹏省..工具形貌对微型搅拌摩擦焊塑性金属流动及焊缝力学性能的影响[J].电焊机,2025,55(3):40-47,8.基金项目
国家自然科学基金(52261013) （52261013）
