摘要
铝合金的搅拌摩擦焊(FSW)通常在焊接区形成上高下低"浅漏斗状"的温度场,使焊缝厚度方向的组织性能差异较大.为了得到更好的焊接效果,文中提出超声搅拌复合焊思想,将超声波通过搅拌头导入焊缝纵深处,以改善焊缝组织性能.试验采用2.5 mm厚的2219铝合金分别用上述两种方法进行焊接,并对焊缝的微观组织和力学性能进行了分析比较.结果表明,两种方法焊接的2219铝合金均可得到成形美观内部无缺陷的焊缝,超声搅拌复合焊的焊缝力学性能明显要优于搅拌摩擦焊.
Friction stir welding(FSW)of aluminum alloy usually results in a special 'funnel shaped' temperature field,which makes obvious difference of microstructure properties in the direction of weld seams.In order to get better properties of welded joints,ultrasonic stir hybrid welding technology has been put forward in this paper,which concentrates the ultrasonic energy in deep weld seams through the stirring pin.Thickness of 2.5 mm 2219 aluminum alloy sheets has been adopted and welded by the two technologies mentioned above in this experiment,microstructure and mechanical properties of weld are analyzed and compared as well.Result shows that the weld joints of 2219 aluminum welded by the two technologies are both with good appearance and defect-free in the inner,and ultrasonic stir hybrid welding obviously has better mechanical properties.
出处
《焊接学报》
EI
CAS
CSCD
北大核心
2011年第12期70-72,108,共4页
Transactions of The China Welding Institution
基金
国家"973"资助项目(2010CB731704)
关键词
超声搅拌复合焊
搅拌摩擦焊
2219铝合金
ultrasonic stir hybrid welding
friction stir welding
2219 aluminum alloy
