scholarly journals Coupled Eulerian-Lagrangian prediction of thermal and residual stress environments in dissimilar friction stir welding of aluminum alloys

2021 ◽  
pp. 100052
Author(s):  
Kareem Salloomi ◽  
Sanaa Al-Sumaidae
Keyword(s):  
Residual Stress ◽  
Friction Stir Welding ◽  
Aluminum Alloys ◽  
Friction Stir ◽  
Dissimilar Friction Stir Welding ◽  
Stress Environments

Underwater dissimilar friction stir welding of aluminum alloys: Elucidating the grain size and hardness of the joints

2017 ◽  
Vol 233 (4) ◽  
pp. 763-775 ◽  
Author(s):  
Khosro Bijanrostami ◽  
Reza Vatankhah Barenji
Keyword(s):  
Grain Size ◽  
Friction Stir Welding ◽  
Aluminum Alloys ◽  
Classical Equation ◽  
Hardness Test ◽  
Traverse Speed ◽  
Welding Parameters ◽  
Friction Stir ◽  
Dissimilar Friction Stir Welding ◽  
Electron Microscopes

Underwater dissimilar friction stir welding of the AA6061 and AA7075 aluminum alloys was performed in this study. The effect of friction stir welding parameters on the grain size and hardness of the joints was studied using empirical models. The microstructure of the joints was characterized by means of light and transmission electron microscopes. The Vickers hardness test was conducted to measure the hardness of the joints. In addition, the process parameters including traverse and rotational speeds, grain size and hardness of the joints were correlated. The results revealed that the developed models predicted the hardness and grain size of the joints, precisely. Higher traverse speed and lower rotational speeds resulted in finer grain size and larger hardness. The grain boundaries and dislocations were identified as responsible for the higher hardness of the joints welded at lower heat input conditions. Moreover, the Hall–Petch relationship showed a deviation from its linear classical equation, which was due to the formation of substructures such as dislocations inside the grains.

A study on microstructures and residual stress distributions in dissimilar friction-stir welding of AA5086–AA6061

2012 ◽  
Vol 47 (14) ◽  
pp. 5428-5437 ◽  
Author(s):  
H. Jamshidi Aval ◽  
S. Serajzadeh ◽  
N. A. Sakharova ◽  
A. H. Kokabi ◽  
A. Loureiro
Keyword(s):  
Residual Stress ◽  
Friction Stir Welding ◽  
Stress Distributions ◽  
Friction Stir ◽  
Dissimilar Friction Stir Welding

scholarly journals Dissimilar Friction Stir Welding of Aluminum Alloys

2009 ◽  
Vol 27 (5) ◽  
pp. 10-15 ◽  
Author(s):  
Sang-Woo Song ◽  
Nam-Kyu Kim ◽  
Chung-Yun Kang
Keyword(s):  
Friction Stir Welding ◽  
Aluminum Alloys ◽  
Friction Stir ◽  
Dissimilar Friction Stir Welding

scholarly journals Investigation into the Dissimilar Friction Stir Welding of AA5052 and AA6061 Aluminum Alloys Using Pin-Eccentric Stir Tool

Metals ◽  
2019 ◽  
Vol 9 (7) ◽  
pp. 718 ◽  
Author(s):  
Yu Chen ◽  
He Wang ◽  
Huaying Li ◽  
Xiaoyu Wang ◽  
Hua Ding ◽  
...  
Keyword(s):  
Friction Stir Welding ◽  
Aluminum Alloys ◽  
Material Flow ◽  
Tensile Tests ◽  
Friction Stir ◽  
Dissimilar Aluminum Alloys ◽  
Dissimilar Friction Stir Welding ◽  
Average Grain Size ◽  
Dislocation Strengthening ◽  
Onion Ring

Friction stir welding with different pin-eccentric stir tools (the pin eccentricities were 0, 0.4, and 0.8 mm, respectively) was successfully utilized for joining dissimilar aluminum alloys AA5052 and AA6061, and the influences of pin eccentricity on the microstructural evolution and mechanical properties of joints were investigated. The results showed that sound joints could be obtained by placing the hard AA6061 in the advancing side, while the welding heat input led to both the coarsening of strengthening precipitates and dynamic recrystallization and softening of the nugget zone (NZ). The application of pin eccentricity promoted the material flow in the NZ and enlarged the area of the “onion ring”. Furthermore, the average grain size and fraction of recrystallized grain in the NZ decreased as the pin eccentricity increased. All joints failed in the NZ during tensile tests, and the joint produced by the 0.8 mm-pin-eccentric stir tool performed the highest tensile strength due to the enhanced grain-boundary and dislocation strengthening.

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