Current types in resistance welding

Basically, a distinction is made between alternating and direct current. In older machines and systems, mains-frequency systems are still found in the alternating current version (50 or 60 Hz). This requires a thyristor power unit and a conventional welding controller, e.g. FiliusACS, Ratia73 or GeniusACS. A second, albeit extremely rare, representative of alternating current is low frequency or frequency converter.

Direct current can be generated via three-phase secondary rectifiers (6-pulse circuit) or single-phase double-wave secondary rectifiers. In the first case, three thyristor power units and a control with three ignition outputs (Ratia73 R2) must be used.

Most applications are for medium-frequency direct current generated by the combination of inverters and MF transformers with secondary rectifiers (e.g. GeniusMFIxxx or GeniusHWI xxx inverters and the corresponding medium-frequency transformers).

At HWH, you will find the right control unit and the corresponding power unit for all possible types of current. With the Filius, XComand operating units and the XPegasus interface, you will even find a uniform programming concept, regardless of the type of current.