AC Square-Wave Arc Model and Analysis of Characteristics Waveform

This article establishes an AC square-wave SAW arc model, and the arc characteristic of the AC square-wave is analyzed by the model. The model uses the arc voltage as the feedback of closed-loop control considering the characteristic of AC wave. The AC square-wave arc is described by the first-order differential equation. A time constant can be draw from this model, which shows the self-regulation ability of the arc. The impact of the AC square-wave SAW parameters on the current and voltage waveform can be obtained from this model. The relationship between arc stability and welding parameters can be discussed by the model. The research provides guidance for the AC square-wave submerged arc welding arc closed loop control strategy.