*Challenges and Advances in Welding and Joining Magnesium Alloy to Steel DOI: http://dx.doi.org/10.5772/intechopen.101862*

the interfacial reaction was achieved through diffusion and combination of alloying elements from the BM. The phase formation in the magnesium-interlayer-steel alloy system and the mechanism of wetting in magnesium-interlayer-steel alloy system were extensibility investigated. The benefits of using Cu, Ni, Sn, Zn, and Cu-Zn interlayers were also explored. The addition of suitable interlayer improves the spreadability and the nucleation of magnesium on the steel substrate. Therefore, more interlayer materials that form the eutectic phase with Mg either in a pure form such as Ag and Al or as alloys such as Al-Cu and Ag-Sn should be investigated.

Currently, a great deal of research has been conducted on the interface characteristics and mechanical performance of Mg alloys to steel joints, particularly under static loading. Under optimized processing conditions, excellent static strength has been achieved, even surpassing that of Mg alloy base metal with insertion of Ag, Cu, and Ni intermediate elements. However, few experiments have been carried out on the corrosion behavior of the jointed parts and the joints performance under dynamic loading. Thus, cost-effective and reliable joining techniques for Mg/steel will still require further development. The need for the industries for more advanced materials to accommodate the huge demands for strong, rigid and light structures may be the powerful drivers for further development of the welding techniques of hybrid structures of Mg alloys to steel.
