摘要
沿搅拌头方向将超声能量引入对接焊焊缝,利用超声波的振动作用,促进搅拌针周围金属原子的运动和扩散能力,能有效地细化和均匀化焊核区的金属组织,改善焊缝材料的塑性流变行为,增强焊缝底部的搅拌强度,提高搅拌摩擦焊焊接质量和焊接效率。通过对1.8 mm厚2024-T4铝合金进行平板对接焊试验,对比研究了搅拌摩擦焊焊接接头组织与性能。结果表明,超声辅助搅拌摩擦焊能有效减少焊接缺陷,并且接头强度提高了10%,超声辅助搅拌摩擦焊优越性效果明显。
Ultrasonic power was employed into butt welded joint along the stir tool direction （perpendicular to the welding direction）. Owing to ultrasonic vibration, the metal atoms motion and diffusion abilities were enhanced, thus the microstructure of nugget zone was more uniform and refined, the plastic rheology of materials and the stirring intensity at bottom of welded joints was improved, and the quality and efficiency of fxiction stir welding were increased. Through the welding tests of 2024-T4 aluminum alloy sheet with 1.8 mm-tbickness, The joint properties and microstructure of friction stir welding （FSW） and ultrasonic-assisted friction stir welding （UA-FSW） were studied and contrasted. The results show that ultrasonic-assisted friction stir welding can effectively decrease the welding defects and increase strength of the joint by 10%. The joint quality and stability of UA-FSW are better than those of the FSW. The advantage of UA-FSW is obvious.
出处
《热加工工艺》
CSCD
北大核心
2016年第15期216-219,共4页
Hot Working Technology
基金
湖南省教育厅科学研究项目(15C0080)
关键词
超声辅助搅拌摩擦焊
2024-T4铝合金
组织
性能
ultrasonic-assisted friction stir welding
2024-T4 aluminum alloy
microstructure
mechanical properties
