Effects of tool offset, pin offset, and alloys position on maximum temperature in dissimilar FSW of AA6061 and AA5086

Amir Ghiasvand,Maziar Mahdipour Jalilian,Mahdi Kazemi,Hossein Ahmadi Rashid

doi:10.1186/s40712-020-00118-y

Abstract

Friction stir welding (FSW) is a solid-state welding technique, which two workpieces join by pressure and large plastic deformation near their melting points. The tool offset, pin offset, and position of dissimilar alloys can highly affect the maximum temperature and heat distribution in FSW process. In current research, the effects of three mentioned variables on the maximum temperature of FSW of AA6061 and AA5086 alloys have been investigated. In this manner, Response Surface Methodology (RSM) as an auxiliary method has been used. The results show that pin offset is the most effective parameter affecting maximum achieved temperature. In all pin and tool offsettings, placing the harder alloy (AA6061) at advancing side results in more maximum temperature increment compared to the case which the harder alloy is at the retreating side.

Highlights

Friction stir welding (FSW) is a solid-state welding technique, which two workpieces join by pressure and large plastic deformation near their melting points (Mishra et al, 2014)
The results showed that tool offset could affect the weld mechanical properties
Model and responses To study the effect of main factors and interactions on maximum temperature of process, Central Composite Design (CCD) was utilized

Summary

Introduction

Friction stir welding (FSW) is a solid-state welding technique, which two workpieces join by pressure and large plastic deformation near their melting points (Mishra et al, 2014). In comparison with other techniques, FSW has some advantages, e.g., lower required energy, lower residual stress, better mechanical properties, lower defects, and nature-friendly (Aliha et al, 2016). This process is used to join similar and dissimilar materials. The main factor in forming appropriate and defectless connection in the FSW process is generating heat and its proper distribution. Heat in FSW is generated by friction and plastic flow (Schmidt et al, 2003). Due to asymmetrical heat distribution in FSW, different regions are formed in

Methods

Results

Conclusion