*Metals* **2019**, *9*, 875

welding speed were altered. To know their soundness in terms of defects and strength, the joints were subjected to microscopic and mechanical tests. The following important findings can be drawn from the study:


**Author Contributions:** Conceptualization, A.L., H.W. and G.H.; methodology, A.L. and H.W.; formal analysis, A.L., H.W., G.H. and B.H.; investigation, A.L., H.W. and G.H.; writing—original draft preparation, A.L. and H.W.; writing—review and editing, A.L., G.H., K.A. and B.H.; visualization, A.L. and H.W.; supervision, G.H.

**Funding:** The necessary funding to realize this work in the research community was provided by Fundamental Research Funds for the Central Universities (Grant No. NS2015055), High-End Foreign Experts Project with Universities directly under the Administration of Ministries and Commissions of the Central Government (Grant No. 011951G19061), National Natural Science Foundation of China (Grant No. 51105202) and State Administration of Foreign Experts Affairs PR China and Ministry of Education PR China (111 project, Grant No. B16024), for which the authors are grateful.

**Acknowledgments:** The authors are thankful to GIK Institute of Engineering Sciences and Technology (Pakistan) for providing advisory and technical support.

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