The process starts from high-purity metal smelting (Sn, Pb, Ag, Au, Ni, Co, Cu, Pd, In, Sb, Bi, rare earth Etc.), Through rolling equipment to manufacture a variety size of ribbon, Finally use precision molds to form solder all kinds of shapes required to meet customers requirement, Use flux-free solder preforms in In formic acid, hydrogen atmosphere or vacuum to weld, It is ultra-low voids