摘要
对于回填式搅拌摩擦点焊工艺,套筒的最大下扎位置和套筒回抽路径上容易形成因材料流动不足而导致的孔洞和未填充缺陷,而套筒形貌是影响焊接过程中材料流动的主要因素。提出在套筒外壁开设倾斜凹槽的方法,在试验验证有限元模型正确性的基础上,利用数值模拟的方法对凹槽影响材料流动行为的规律进行分析。研究结果表明:倾斜凹槽有助于提高材料向下流动的速度。随着凹槽宽度增加,材料最大向下流动速度下降而材料高速向下流动的区域变大,当套筒宽度为0.75mm时,套筒促进材料向下流动的效果最为明显。
For refill fiction stir spot welding,voids and lack of fill defects induced by insufficient material flow are easily formed at the maximum plunging position of sleeve and the movement path of sleeve.The geometry of sleeve is the main factor influencing the material flow during welding.In this paper,the outside wall of sleeve with inclined grooves were designed.On basis of the verification of rightness of finite element model by experiments,the effect of groove on material flow behavior was investigated by numerical simulation.The results show that the inclined groove can heighten the material downward flow velocity.With the increase of groove width,the material downward flow velocity decreases and the material high-speed flow area increases.When the groove width is 0.75mm,the sleeve has the most obvious effect on promoting the downward flow of material.
作者
赵华夏
李登常
王月
姬书得
ZHAO Huaxia;LI Dengchang;WANG Yue;JI Shude(AVIC Manufacturing Technology Institute,Beijing 100024,China;College of Aerospace Engineering,Shenyang Aerospace University,Shenyang 110136,China)
出处
《航空制造技术》
2020年第3期53-58,共6页
Aeronautical Manufacturing Technology
关键词
回填式搅拌摩擦点焊
凹槽
数值模拟
材料流动
有限元模型
Refill friction stir spot welding
Groove
Numerical stimulation
Material flow
Finite element model
