Thoriated tungsten {tungsten, 98 %; thorium oxide. 2 %) is a widely used electrode material for inert-gas arc-v.,elding. Data for the hc~,t capacity, electrical resistivity, and hemispherical total emissivity of this material are reported for the temperature range 1200-3600 K. A subsecond pulse-heating technique was applied to rod specimens: radiance temperature was measured by high-speed pyrometry. Literature values of the temperature dependence of the normal spectral emissivity of tungsten were used to obtain true temperatures, using the melting point of thoriated tungsten as a calibration point. Reported uncertaintics for the properties are 4% for heat capacity, 1.5 % for electrical resistivity, and 7% for hemispherical total emissivity. KEY WORDS: electrical resistivity: heat capacity: hemispherical total emissivity: high temperature: tungsten: welding electrodes.
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