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% Lanthanated:Non-radioactiveBest general purpose electrode at medium to highter amperage for both A/C or D/C using inverter or transformer based constant current power sourcesGood for low-alloyed steels, non corroding steels, aluminum alloys, magnesium alloys, titanium alloys, nickel alloys, and copper alloysGood arc starts and stability, low erosion rate, medium to high current range