Energy input measurement

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To estimate the energy input of the arc into the workpiece, we measure the heat flux density and the electric current density.

For this purpose, the torch is moved over two water-cooled copper plates, which are thermally and electrically insulated by a 0.15 mm gap. To determine the heat flux density, the current intensity is recorded in relation to the distance of the arc center from the parting plane. For the heat flux density, the temperature change and the mass flow of the cooling water are measured. The Abel integral equation is used to calculate the electric current and heat flux density in relation to the arc radius from the current and calorimetry curves.

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