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Adaptive control of the welding frequency for roller seam welding

Welding with 3-phase DC or MF:

The DC produced from a three-phase AC grid or the rectified 1000 Hz MF current provides energy continuously to the piece for welding. This method is used to good effect at high, fixed welding speeds.

To achieve good welding results, a minimum ripple of the welding current is required" (DVS 2906). Sealed, volume or fixed seams are achieved by controlling the welding current with a variable mark/space ratio.

The decisive disadvantages of welding with DC are:

  • The welding current ripple can only be limited to a degree
  • Owing to the Peltier effect, there is a risk of different heating of the electrodes and the welding specimen alloy.

Welding with AC and single phase DC

Servo inverters in resistance press welding systems

Using servo inverters in welding systems offers a way out: The disadvantages of DC, such as the lack of ripple and the
alloy susceptibility, as well as the disadvantages of the limited advance speed at 50 Hz AC can be fully compensated with this type of current.

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