航空材料学报2012，Vol.32Issue(4)：26-31,6.DOI:10.3969/j.issn.1005-5053.2012.4.005
6061-T4铝合金搅拌摩擦焊T型接头缺陷及性能
Defects and Properties of Friction Stir T-Welded Joints for 6061-T4 Aluminum Alloy
摘要
Abstract
The processes of friction-stir-welded T-joints for 3mm thick AA 6061-T4 were investigated, and the influences of welding speeds and rotating speeds on welding defects and mechanical properties were discussed specifically. It was found that for given fixture and tool, when v was kept constant, tunnel defects were easily produced at the fillet corner of stringer nugget along advancing side which became smaller with the increasing ω/v. Clear "Z" line was tended to appear near the retreating side. Two soften zones that were enlarged with the increasing ω were found in the skin. The hardness in the center of weld was increased with the ω increased. The stringer thermo-mechanically affected zone was also softened and its hardness was reduced 17.0%. The decreased hardness was the main factor to reduce the tensile strength of all T-joints along skin direction. The best tensile strength was only up to 73. 8% compared to base material. Tunnel defect was the main reason to reduce tensile strength in the stringer direction for ω = 1008r/min. And the softer microstructure of thermal mechanical affected zone in T-joints was contributed to the decrease of tensile strength for ω = 1541r/min and ω = 2256r/min. The highest tensile strength reaches to 83. 5% of the base material when ω/v = 1541/218 r/mm.关键词
搅拌摩擦焊/T型接头/焊接缺陷/力学性能Key words
friction stir welding/T-welded joints/welding defects/mechanical properties分类
矿业与冶金引用本文复制引用
周光,杨新岐,徐效东,张照华..6061-T4铝合金搅拌摩擦焊T型接头缺陷及性能[J].航空材料学报,2012,32(4):26-31,6.基金项目
国家自然科学基金资助项目(50775159) （50775159）
