Abstract:The interfacial bonding state for the different metals Ag, Ni without metallurgic are actions was studied. The tensile test of the joint concludes that the bonding strength of Ag,Ni in cold pressure welding is strong enough to satisfy the demand of application, while the value of bonding strength is larger than that of Ag base. The conclusions further signify that the metals(hardly being mutual soluble) can be welded, and supply extremely important references to the further study either on test or theory for the weldability of different metals. The theoretical analysis and calculations of the bonding strength were made on the base of thermodynamics, crystallography, solid physics etc. Moreover, by means of microscopic test and analysis, especially drawing support from the research of Al-Pb, this strong bonding mainly depends on the mechanical bonding power and metal atomic linkage, but not on the atomic diffusion.

Key words:  metallurgic reactions; cold pressure welding; interface bonding