**4. Conclusions**

This experiment can lead to the following conclusions:


This study found that the hot wire current plays an important role in cooling rates and tensile strength. Therefore, the hot wire process parameters should be used appropriately to maximize the benefits of the hot wire plasma arc welding workpiece. In the future, the optimization of the hot wire process parameters will be performed to obtain the most suitable parameters and study the phenomena that affect the results. This manuscript only reports appropriate parameters of the hot wire process effects on tensile strength and microhardness.

**Author Contributions:** Conceptualization, N.N.; methodology, N.N.; data curation, J.N., W.P., and R.Y.; validation, N.N. and J.N.; writing—original draft preparation, N.N.; writing—review and editing, N.N.; supervision, N.N.; project administration, J.N. and W.P.; funding acquisition, N.N. 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 National Metal and Materials Technology Center (MTEC), National Science and Technology Development Agency, Thailand for financial support.

**Conflicts of Interest:** The authors declare no conflict of interest.
