Electrode Temperature in the Arc-Discharge Zone Attachment

The paper presents results of electrode‐surface temperature measurements in the arc‐discharge attachment zone. The investigations were carried out on tungsten electrodes in helium atmosphere and on zirconium electrodes in nitrogen atmosphere for currents within the range of 100…200 A. The contribution of plasma radiation to pyrometer readings has been determined. The real temperature of the tungsten electrode surface was measured using the polarised radiation at the wavelength λ = 0.65μ m. The energy distribution of arc‐spot radiation has been obtained for the spectral range of 0.4…1.2 μ m. The character of the arc‐spot radiation spectrum has been analysed.