Inverter current source for pulse-arc welding with improved parameters

The feature of power current sources for pulse-arc welding is superimposing of current pulses with a defined shape, size and frequency on the main welding current. The purpose of this paper is to explore the possibilities to control the parameters of superimposed pulses by a particular (additional) welding inverter current source with improved parameters. The current pulse superimposed to the basic current has duration of 1.5 ÷ 3.0 μs and is realized by an additional source. The operation and the characteristics of the scheme are investigated by simulations (PSpice) under various modes and loads. The formation and separation of the drop from the end of the electrode is controlled by the amplitude and duration of the pulse current. Thus, the average welding current can be significantly reduced. Dependences of the parameters of pulses on specific components of scheme are derived. Recommendations are made to improve the performance and utilization of the circuit elements and the technological process. Design recommendations are presented to optimize the parameters of the transformer.