The Effect of Element Ag and P in Dissolving Action and Mechanical Performance of the Welds during Weld Brazing of Copper

Dissolving action of Ag and P during weld brazing of thick copper plates without preheating was investigated and the mechanical performance of the weld of copper was analyzed. The difference of dissolving action between Ag and P is that Ag-Cu binary alloys dissolve base metals in form of body dissolution, while P diffuse into grain boundary first and reach the limit solid solubility gradually then the surface layer of base metal begins to dissolving. The stirring function of arc is important for dissolving action of P but has little effect on dissolving action of Ag. P in form of rigid and brittle Cu3P increases the micro-hardness of welds.