**4. Conclusions**

A reliable semi-solid state brazing joint of Copper connected to aluminum was successfully obtained using a new technique for non-vacuum ultrasound-assisted non-prefabricated semi-solid high-frequency induction brazing. The microstructure evolution and physical properties of Al/Zn-22Al/Cu joints were studied. Based on the achieved results, the conclusions are summarized as follows:


**Funding:** This project is supported by the National key R&D program (Grant No. 2018YFB1305305), and the National Natural Science Foundation of China (Grant No. U1731118).

**Author Contributions:** Conceptualization, P.H. and J.W.; Formal analysis, Y.L.; Investigation, Y.L. and Y.S.; Project administration, H.Z.; Resources, J.P. and H.Z.; Supervision, J.P.; Validation, P.H.; Visualization, P.H. and Y.S.; Writing—original draft and revising, Y.L.; Writing—review and editing, all the authors; Writing—revising, L.C. and Y.L. All authors have read and agreed to the published version of the manuscript.

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