Different welding techinques (i.e. resistance welding, capacitive discharge or CD welding, induction welding, ultrasonic welding, stud welding and tungsten inert gas welding)require the same kind of capacitor, namely these application needs high energy/power densities and a good response to pulses. Expecially for CD welding, the work curve is a sudden discharge which start with a high current input, that rise to a top value and than decrease.

The main characteristic that a welding capacitor should present is good response in charge/discharge events, translated in parameters: a strong robustness of dielectric and papers and a high resistance to current spikes. Preferably high voltage bank modules of capacitor, renouncing to compactness, accomplish the duty of current needs.