**5. Conclusions**

In this study, based on the CA-FD model coupled with the FE model, the temperature distribution and dendritic morphology of the molten pool for TC4 alloy plates welded by GTAW were analyzed theoretically and experimentally. In addition, the effect of the welding current on weld bead geometry was analyzed in detail. In summary, the main conclusions inferred from the above analysis are as follows:


**Author Contributions:** Conceptualization, M.Z. and Y.Z.; Data curation, C.H.; Formal analysis, W.Z.; Investigation, Y.Z.; Methodology, J.L.; Resources, J.L.; Software, W.Z.; Supervision, M.Z.; Validation, C.H.; Writing—original draft, Y.Z.; Writing—review & editing, Q.C.

**Funding:** This research was funded by the Natural Science Foundation of China, grant number 51274162, and the Education Department of Shaanxi Provincial Government scientific research projects of key laboratory, grant number 15JS082, and the Education Department of Shaanxi Provincial Government service local special projects, grant number 16JF021.

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