The microstructure and mechanical properties of friction stir welded Al–Zn–Mg alloy in as welded and heat treated conditions

Effect of Preheating on Microstructure and Tensile Properties of Friction Stir Welded AA7075 Aluminium Alloy Joints

“…Examining these three stir zone regions in PRERT joint, low aspect ratio coarse grains is observed in the shoulder affected region, these grains are coarser than that of in the middle SZ region [11]. The finer grains are observed in the pin affect region than that in middle stir zone region it is due to sufficient stirring action caused by tool [25]. Similar type of grain pattern at SZ is observed in all preheated weld joints.…”

Friction Stir Welding of Dissimilar Butt Joints with Novel Joint Geometry

“…It likewise deals with the plastic flow of models to evaluate the velocities around the pin. Singh et al [7] reported that post weld heat treatment decreases the strength, but enhances the percentage of elongation during the friction stir butt weld between rolled plates of 7039 aluminium alloy.…”

Effect of Post Weld Heat Treatments on Mechanical and Stress Corrosion Cracking Behaviour of Aa7075 Friction Stir Welds

“…Because of the absence of parent metal melting and related problems such as brittle dendrite structure, porosity, distortion and residual stresses, this process can be used for joining most of the aluminium alloys [1]. FSW of aluminum alloys offers the advantages of low heat input, reduced distortion, therefore, low residual stresses and higher mechanical properties compared to conventional fusion welding methods [2].…”

“…The welding temperatures in FSW ranges between 425 0 C-480 0 C. The welding temperature never exceeds 80% of melting point and does not cause melting but high enough to cause dissolution/overaging of strengthening particles in heat affected zone (HAZ), thermomechanically affected zone (TMAZ) and the nugget zone (NZ) leading to the formation of a softened region with degraded mechanical properties generally in heat affected zones [2,3]. FSW causes grain refinement in the weld zone due to which the tensile strength of the joint increases with little loss of ductility [1].…”