The effect of tool pin size and taper angle on the thermal process and plastic material flow in friction stir welding

Friction stir welding (FSW) tool pin, as a critical component of FSW tool, plays an important role in determining the final joint properties by affecting heat generation, plastic material flow, loads, and so on. However, effects pin on mass transfer are not elucidated quantitative studied. In present study, validated model was adopted to quantitatively analyze size taper angle thermal process flow FSW. The root diameter, tip were investigated, respectively. It reveals that torque transverse force imposed increased with increase diameters (including its condition constant angle), while total varies little for diameter considered this study. When increase, viscosity materials near is decreased, temperature well velocity increased. More could rotate around diameter. TMAZ boundary enlarged larger Particularly, shear layer thickness same horizontal plane range 1 mm < z 5 significantly diameters. region when using addition, maximum width at top surface workpiece affected experimental results. lay solid foundation optimizing