TIG welding electrodes usually contain small quantities of metallic oxides which can offer the following benefits: -Facilitate arc starting -Increase arc stability -Improve current carrying capacity of the electrode -Reduce the risk of weld contamination -Increase electrode lifeOxides used are primarily zirconium, thorium, lanthanum or ceriumAdditions are 1% - 4%, improve arc initiation, especially when direct current (DC) welding is employedThorium oxide (thoria), effective in terms of long life and thermal efficiencyZirconium oxide (zirconia) has been commonly used for alternating (AC) TIG welding, welding aluminumElectrode length: 7"Each package contains 10 electrodes; 2% Thoriated:Good current capacity, arc stability and easy arc start on DC currentHigh resistance to weld pool contaminationMaintains sharpened tip configurationNot normally used on AC current because it is difficult to maintain the balled endMedium tendency to spitMedium erosion rate;