Related Experiment Video
Updated: Feb 25, 2026

Generating Lap Joints Via Friction Stir Spot Welding on DP780 Steel
Published on: August 13, 2019
Design of Friction Stir Welding Tool for Avoiding Root Flaws
Shude Ji1, Jingwei Xing2, Yumei Yue3
1Faculty of Aerospace Engineering, Shenyang Aerospace University, Shenyang 110136, China. jishude@sau.edu.cn.
Abstract:
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.
Related Concept Videos
Residual Stresses
Steel Fastening Techniques
Rivets are cylindrical steel fasteners with a specially designed head. During application, rivets are heated until white-hot and then inserted through pre-drilled holes in the steel sections. A pneumatic hammer is used to shape the exposed end into a second head, securing the sections together.
Bolting is another...
Thin-Walled Hollow Shafts
Mechanical Characteristics of Steel
The tension test is fundamental for determining tensile strength. In this test, a steel specimen is stretched using a gripping device until it breaks. The data collected during this test are used...
Residual Stresses in Circular Shafts
Frictional Force

