中南大学学报（自然科学版）2012，Vol.43Issue(10)：3801-3806,6.
冷却条件对2519A铝合金搅拌摩擦焊焊缝性能的影响
Influence of cooling conditions on joint properties of 2519A aluminum alloy by friction stir welding
摘要
Abstract
Friction stir welding was used to weld 2.75 mm thick 2519A aluminum sheets. The sheets were welded in conventional condition (in air) and flowing water condition. The influence of cooling conditions on. the microstructure and mechanical properties of the joint was investigated. The results indicate that with the rotation speed of 2 700 r/min and welding speed of 60 mm/min, the water cooling welding results in better joint, and improves the joint strength to 340 MPa. In water cooling condition, the softening region becomes remarkably narrow, and its hardness value is improved. Moreover, the grain size of the nugget zone is much smaller than the grain size in air cooling condition. In water cooling, the distribution of the hardness in the nugget zone is almost a straight line, while in air cooling, the hardness in nugget zone firstly becomes higher and then lower, and it changes significantly. The average hardness in the nugget zone by water cooling is smaller than the average hardness in air cooling condition, because the air cooling can improve the solution degrees and promote the aging process.关键词
搅拌摩擦焊/2519A铝合金/焊接冷却工艺/硬度/析出相/强度Key words
friction stir welding/2519A aluminum alloy/welding cooling conditions/hardness/precipitates/strength分类
矿业与冶金引用本文复制引用
宋继超,叶凌英,张新明,贺地求,李红萍..冷却条件对2519A铝合金搅拌摩擦焊焊缝性能的影响[J].中南大学学报（自然科学版）,2012,43(10):3801-3806,6.基金项目
国家重点基础研究发展计划("973"计划)项目(2012CB619500) （"973"计划）
