Esab Ab

David Juliusson

A method is performed in a welding or cutting system including a power supply configured to deliver current pulses through a weld circuit to a contact tip extending from a welding torch to create an arc on a workpiece. The method includes: while the contact tip is shorted to the workpiece to set an arc voltage equal to zero: sampling a current pulse to produce current values; and at a voltage sense point, on the power supply or the weld circuit, that is spaced-apart from the welding torch, sampling a voltage pulse associated with the current pulse to produce voltage values that differ from the arc voltage due to an electrical circuit parameter of the weld circuit; and computing a value of the electrical circuit parameter based on the current values, the voltage values, and the arc voltage equal to zero.

Weld circuit calibration for arc voltage compensation

A method, performed in a welding or cutting system including a power supply configured to deliver a current to a welding torch to create an arc on a cut-off workpiece, comprises: sampling the current to produce digitized current values; filtering the digitized current values using a first digital filter to produce filtered digitized current values; sampling a voltage corresponding to the current to produce digitized voltage values; filtering the digitized voltage values using a second digital filter to produce filtered digitized voltage values; and controlling a current level of the current using the filtered digitized current values or the filtered digitized voltage values.

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Gothenburg, Sweden

David Juliusson