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Capacitor Discharge Technique

In these units, the energy which is necessary for welding, is first stored in capacitors and then, during the actual welding time, released at the welding point in the form of pulses. Here, extremely high welding currents of several hundreds kA with very short welding times within the ms-range can be reached. The welding time itself, however, is not settable and the adaptation of the welding parameters in the case of variations is limited.


  • extremely high currents at very short times possible
  • small heat-affected zone
  • low system load, even with high output currents


  • inflexible
  • practically suitable for projection welding only
  • influence on current path not possible
  • welding time NOT settable
  • very expensive and time-consuming
  • storage is carried out with high voltage
  • the charging time of the capacitors restricts the welding clock rate

Our products: As this technique is difficult to control and too inflexible, we do not offer any products to that end.

Alternative solutions:
Since power sources which are based on high-frequency inverters generate a comparable current quality with high rates of current rise, the HFDC inverters SPATZ+H300, SPATZ+H9000 and the DragSPATZ series are a good alternative. In combination with the capacitor storage technique of the SumoSPATZ units, the necessary connected loads are reduced to a low level.