摘要
研究了4种不同冷却条件对6 mm厚2219铝合金搅拌摩擦焊接头组织及性能的影响。结果表明：冷却介质的导热效果越好,焊缝成形越美观。采用空气冷却＋水雾及纯水冷焊接的接头,其轴肩下方的晶粒尺寸更为细小。冷却介质的瞬时快冷作用提高了接头的显微硬度。自然冷却条件下接头的抗拉强度平均为331.5MPa,伸长率平均为5.4%,采用空气冷却＋水雾及纯水冷焊接接头的抗拉强度为370～380 MPa,伸长率为5.5%～6.0%,比自然冷却条件下焊接的接头抗拉强度提高约45MPa左右,达到母材强度（450～460 MPa）的80%以上。
The effects of four different cooling conditions on the microstructure and properties of the 6 mm thick 2219 aluminum alloy friction stir welding（FSW） joint were studied. The results show that the heat conduction effect of the cooling medium is better and the weld forming is more beautiful. The grain size of the position under the shaft shoulder of the welded joint is smaller by using air cooling ＋ water mist and pure water cooling. The instantaneous rapid cooling of the cooling medium enhances the microhardness of the joint. The average tensile strength of the joint under natural cooling condition is331.5 MPa, and the average elongation is 5.4%. The tensile strength of the welding joints by using air cooling ＋ water mist and pure water cooling is 370-380 MPa, and the elongation is 5.5%-6.0%, and the tensile strength of the welded joints is increased by about 45 MPa than that of the welded joint under natural cooling conditions, which reaches more than 80% of the base metal strength of 450-460 MPa.
作者
孙世烜
贾晓喆
高彦军
李超
王凯
李晓光
SUN Shixuan;JIA Xiaozhe;GAO Yanjua;LI Chao;WANG Kai;LI Xiaoguang(Capital Aerospace Machinery Corporation,Beijing 100076,China)
出处
《热加工工艺》
CSCD
北大核心
2018年第17期25-29,35,共6页
Hot Working Technology
基金
国家自然科学基金资助项目(51375150,51205114)
关键词
冷却介质
搅拌摩擦焊
2219铝合金
cooling medium
friction stir welding（FSW）
2219 aluminum alloy
