The electrode material should have sufficiently high electrical conductivity, thermal conductivity and high temperature hardness. The structure of the electrode must have sufficient strength, rigidity and complete cooling conditions.
Since the contact area of the electrode determines the current density and the resistivity and thermal conductivity of the electrode material are related to the heat generation and loss, the shape and material of the electrode have a significant effect on the formation of melt nuclei. The maintenance of the electrode end is particularly important as the contact area increases and the hard point strength decreases with deformation and wear of the electrode end. The electrode is an important component for the quality of resistance welding and has the function of conducting the welding current, pressure and heat to the workpiece.