基于套筒外壁沟槽改善回填式搅拌摩擦点焊过程材料流动行为的研究  

Study on Improved Material Flow Behavior during Refill Friction Stir Spot Welding by Grooves on Sleeve Outside Wall

作　　者：赵华夏 李登常 王月 吕赞[2] ZHAO Huaxia;LI Dengchang;WANG Yue;LYU Zan(AVIC Manufacturing Technology Institute,Beijing 100024,China;College of Aerospace Engineering,Shenyang Aerospace University,Shenyang 110136,China)

机构地区：[1]中国航空制造技术研究院,北京100024 [2]沈阳航空航天大学航空宇航学院,辽宁沈阳110136

出　　处：《热加工工艺》2021年第15期127-130,共4页Hot Working Technology

摘　　要：较差的沿板厚材料流动行为是导致回填式搅拌摩擦点焊接头中出现孔洞缺陷和未填充缺陷的重要原因。鉴于此,提出在组成焊接工具的套筒外壁开设倾斜凹槽的思想,建立了点焊过程材料流动的有限元模型,其合理性通过试验进行了验证。研究结果表明,套筒外壁及端面附近的材料流动速度大于套筒内壁附近材料流动速度。套筒外壁凹槽可以促进材料向下流动,随着凹槽数量的增加,材料向下流动的趋势逐渐加强。套筒外壁附近的材料向下流动促使远离套筒的材料向上流动,形成材料流动的循环。Poor material flow along the thickness direction is the main reason of occurrence of void lack of fill defects in refill friction stir spot welding joint. In order to solve this problem, the idea of notching inclined grooves on the sleeve outside wall was put forward. The finite element model of material flow during welding was established and its rationality was verified by the experiment. The results show that the flow velocity of the materials of the sleeve outside wall and near bottom surface is higher compared with that of the material near the sleeve inside wall. The grooves on the sleeve outside wall can facilitate downward flow of the material, and this effect can be strengthened with the increase of groove number. Moreover, the material downward flow near the sleeve outside wall causes the material upward flow far away the sleeve, thereby forming a cycle of material flow.

关 键 词：回填式搅拌摩擦点焊 凹槽 流场 材料流动 

分 类 号：TG453.9[金属学及工艺—焊接]