In resistance welding, what is the main role of the electrodes?

In resistance welding, one of the primary functions of the electrodes is to conduct electric current to the materials being joined. The welding process relies on the generation of heat through electrical resistance when this current passes through the workpieces. The heat produced is crucial for melting the interface between the materials, allowing for a strong bond to form as the molten metal solidifies upon cooling.

While electrodes also play supportive roles, such as applying pressure to hold the workpieces together during the process, their essential function is to facilitate the flow of current necessary for the welding operation. This electrical conductivity directly influences the welding quality and efficiency by determining the amount of heat generated. Thus, understanding that the primary role of the electrodes is to effectively conduct electric current is fundamental to grasping the principles of resistance welding.