**3. Concluding Remarks**

In all the work that has been performed thus far, it has been noted that all the focus has been on FSP as an enhancement technique on aluminium alloys, magnesium, and other alloys. It is also noticed that the common mechanical properties analyzed include the tensile test, fatigue and microhardness. These properties are studied correlatively with the microstructure. Very few works thus far, which considers friction stir processing as a post weld processing technique for tungsten inert gas dissimilar alloy welded joint. There is minimal to no trace of any literature on submerged friction stir processing of tungsten inert gas and friction stir welded dissimilar alloy joints. Therefore, this opens an opportunity for the exploration on the impact of friction stir processing and submerged friction stir processing towards the properties of the friction stir welded and tungsten inert gas welded dissimilar joints.

**Author Contributions:** Both authors have fully contributed equally to all the work produced. All authors have read and agreed to the published version of the manuscript.

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

**Acknowledgments:** The authors would like to thank the Cape Peninsula University of Technology for allowing this study to be performed.

**Conflicts of Interest:** The authors declare no conflict of interest. The authors declare there is no funding involved in this study.
