Design of Friction Stir Welding Tool for Avoiding Root Flaws

Materials

Shude Ji¹  Jingwei Xing²  Yumei Yue²  Yinan Ma²  Liguo Zhang² 

[1] Faculty of Aerospace Engineering, Shenyang Aerospace University, Shenyang 110136, China;

关键词: friction stir welding;    material flow;    numerical simulation;    root flaws;   

DOI  :  10.3390/ma6125870

来源: mdpi

【 摘 要 】

In order to improve material flow behavior during friction stir welding and avoid root flaws of weld, a tool with a half-screw pin and a tool with a tapered-flute pin are suggested. The effect of flute geometry in tool pins on material flow velocity is investigated by the software ANSYS FLUENT. Numerical simulation results show that high material flow velocity appears near the rotational tool and material flow velocity rapidly decreases with the increase of distance away from the axis of the tool. Maximum material flow velocity by the tool with the tapered-flute pin appears at the beginning position of flute and the velocity decreases with the increase of flow length in flute. From the view of increasing the flow velocity of material near the bottom of the workpiece or in the middle of workpiece, the tool with the half-screw pin and the tool with the tapered-flute pin are both better than the conventional tool.

【 授权许可】

CC BY   
© 2013 by the authors; licensee MDPI, Basel, Switzerland.