**4. Conclusions**

In the present study, dissimilar aluminum alloys (AA5083/AA5754 and AA5083/AA7020) were successfully joined by FSW at a wide range tool rotation speed of 300–600 rpm, a traverse welding speed range of 20–80 mm/min and reversing the alloys between the AS and the RS. From the obtained results the following conclusions can be drawn:


**Author Contributions:** Conceptualization, S.A., E.A. and M.M.Z.A.; methodology, A.M.A.M., E.A. and M.M.E.-S.S.; validation, S.A., N.A.A. and E.A.; formal analysis, S.A. and M.M.Z.A.; investigation, M.M.E.-S.S., S.A. and E.A.; writing—original draft preparation, S.A. and E.A.; writing—review and editing, M.M.Z.A. and N.A.A.; project administration, M.M.Z.A. and M.M.E.-S.S. All authors have read and agreed to the published version of the manuscript.

**Funding:** This research received no external funding.

**Institutional Review Board Statement:** Not applicable.

**Informed Consent Statement:** Not applicable.

**Data Availability Statement:** The data presented in this study are available on request from the corresponding author. The data are not publicly available due to the extremely large size.

**Acknowledgments:** The authors acknowledge the financial support rendered by the Science and Technology Development Fund (STDF), Ministry of Higher Education and Scientific Research, Egypt. **Conflicts of Interest:** The authors declare no conflict of interest.
