**4. Conclusions**

The titanium manufacturing process plays an important role in the mechanical properties and the workpiece machinability. An experimental study was performed to assess the influence of wire arc additive manufacturing on the material properties and on the resulting drilling performance. On the basis of the obtained results, the following conclusions can be drawn:


Overall, from this study, it can be concluded that the workpieces produced by WAAM yield better performance in terms of mechanical properties and burr height, but higher cutting forces would be obtained under the same drilling conditions.

Future research works should consider the influence of the geometrical characteristics of the drill in the cutting process in order to obtain an optimized tool for this new workpiece material. Other lines of research to consider cover the study of different drilling parameters, considering the variance and repeatability with a large sample-size experiment analyzing the wear of the drill. Also of interest is the comparative study of the machinability of the material manufactured by this additive technology versus other material deposition technology such as selective laser melting (SLM) or laser metal deposition (LMD).

**Author Contributions:** Conceptualization, U.A., F.V., and A.S.; Data curation, U.A. and F.V.; Investigation, U.A. and F.V.; Methodology, U.A. and A.S.; Resources, A.S.; Supervision, A.S.; Validation, T.A.; Writing—original draft, U.A., F.V., and A.S.; Writing—review & editing, T.A. All authors have read and agreed to the published version of the manuscript.

**Funding:** This research was funded by the vice-counseling of technology, innovation, and competitiveness of the Basque Government gran<sup>t</sup> agreemen<sup>t</sup> kk-2019/00004 (PROCODA project).

**Acknowledgments:** The authors thank the companies ADDILAN (Spain) and KENDU tools (Spain) for the technical and material support given to this study, as well as Paul Diego Martin for your collaboration.

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