Among all assembly processes, resistance welding represents a solution with countless situations and applications.
For resistance welding it is intended the process based on the principle for which the passage of current through a body, more or less conductor, determines the development of heat in a quantity that is proportional to the electrical resistance of the material itself and proportional to the square of the value of the current (Q=RI 2 ).
Every single material behaves differently towards this law and therefore all materials, either “simple” such as iron, copper, aluminium etc. or compound – alloy, mixture etc. -, have to be treated in different ways.
Materials considered as “good conductors”, therefore having a low resistance, are the most emblematic to be treated because, as it is not possible to work on the resistance R, it is necessary to work on the current I and, consequently, on the power of the machine.