Friction Stir Spot Welding of Different Thickness Sheets of Aluminum Alloy AA6082-T6
Abstract
:1. Introduction
2. Methodology
2.1. Starting Materials
2.2. Friction Stir Spot Welding Process
3. Results and Discussion
3.1. FSSWed Joints Surfaces’ Appearance
3.2. Heat Input Calculation and Temperature Measurement
3.3. Transverse Macrographs of the FSSWed Joints
3.4. Microstructure Investigation
3.5. Hardness Characterization
3.6. Tensile Shear Testing and Fracture Behavior
4. Conclusions
- The applied FSSW parameters in terms of a constant dwell time of 3 s and different rotation speeds of 400, 600, 800, and 1000 rpm succeeded in welding two different thin sheet thicknesses of AA6082-T6 in spot lap joint configuration.
- Among the produced joints, the spot-welded joint processed at 600 rpm achieved the highest SZ hardness of 95 ± 2 HV0.5 and maximum tensile shear load of 4300 ± 30 N.
- The FSSW of AA6082-T6 temper condition significantly decreased the hardness in the weld zone (SZ, TMAZ, and HAZ) compared to the BMs, and the SZ showed higher hardness values than the TMAZ and HAZ.
- The spot-welded joints processed at the lowest rotation speed of 400 rpm and those processed at the highest rotation speed of 1000 rpm failed in the SZ with a ductile fracture mode.
Author Contributions
Funding
Institutional Review Board Statement
Informed Consent Statement
Data Availability Statement
Acknowledgments
Conflicts of Interest
References
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Element | Mg | Mn | Si | Fe | Cr | Zn | Cu | Ti | Al |
---|---|---|---|---|---|---|---|---|---|
(wt. %) | 0.6 | 0.4 | 0.75 | 0.5 | 0.2 | 0.2 | 0.1 | 0.1 | Bal |
AA6082-T6 | Ultimate Tensile Strength(MPa) | Yield Stress(MPa) | Fracture Strength(MPa) | Hardness(HV) |
---|---|---|---|---|
1 mm sheet | 301 | 296 | 236 | 127 ± 3 |
2 mm sheet | 257 | 252 | 245 | 111 ± 2 |
Rotational Speeds (rpm) | 400 | 600 | 800 | 1000 |
Peak Temperature (°C) | 236 ± 4 | 265 ± 3 | 308 ± 5 | 367 ± 3 |
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Ahmed, M.M.Z.; El-Sayed Seleman, M.M.; Ahmed, E.; Reyad, H.A.; Touileb, K.; Albaijan, I. Friction Stir Spot Welding of Different Thickness Sheets of Aluminum Alloy AA6082-T6. Materials 2022, 15, 2971. https://doi.org/10.3390/ma15092971
Ahmed MMZ, El-Sayed Seleman MM, Ahmed E, Reyad HA, Touileb K, Albaijan I. Friction Stir Spot Welding of Different Thickness Sheets of Aluminum Alloy AA6082-T6. Materials. 2022; 15(9):2971. https://doi.org/10.3390/ma15092971
Chicago/Turabian StyleAhmed, Mohamed M. Z., Mohamed M. El-Sayed Seleman, Essam Ahmed, Hagar A. Reyad, Kamel Touileb, and Ibrahim Albaijan. 2022. "Friction Stir Spot Welding of Different Thickness Sheets of Aluminum Alloy AA6082-T6" Materials 15, no. 9: 2971. https://doi.org/10.3390/ma15092971