**4. Conclusions**

In this investigation, a low carbon component with high strength was fabricated by WAAM without any visible detects and an analysis on its microstructure and mechanical properties was undertaken, which showed potential for industrial application. The following conclusions can be drawn:


**Author Contributions:** Methodology, C.G. and D.Y.; writing-original draft preparation, L.S.; project administration and funding acquisition, F.J. and R.H.; data curation, J.W.; writing—review and editing, providing ideas, C.G and F.J. All authors have read and agreed to the published version of the manuscript.

**Funding:** This work was supported by the National Key R&D Program of China (No. 2017YFB1103701); the National Natural Science Foundation of China (No. 51671065); the Equipment Development Department for Commission of Science and Technology (No. 41423030504); the Applied Technology Research and Development Plan of Heilongjiang (No. GA18A403); and the Natural Science Fund of Heilongjiang Province (No. ZD2019E006).

**Acknowledgments:** Authors appreciate the help of Research & Development Centre and Quality Inspection O ffice, Harbin Welding Institute Limited Company.

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