Effect of Grain Morphology on Consumption of GTA Electrode(Physics, Process, Instruments & Measurements)

概要

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This work was made on tungsten electrodes activated with ThO_2, La_2O_3, Y_2O_3, and CeO_2. The phenomena of electrode consumption were investigated from the point of view of those oxides' behavior during arc discharge. The results indicated that ThO_2-W electrode has inferior characteristics among those electorodes at low arc current, but at high arc current all electrodes exhibit insufficient properties. The morphology of tungsten grain has an influence on the stability and life time of electrode of gas-tungsten arc. Two types of tungsten electrode, whose grain have a longitudinal shape and a granular shape were compared experimentally, and it was shown the longitudinal type has a superior properties than the granular type. To clarify the effect, the behaviors of oxide during arc discharge were reviewed and discussed. And based on the theory of oxide behavior deduced from the review, the effects of tungsten grain shape on the temperature and consumption were discussed.
大阪大学の論文