2% THORIATED TUNGSTEN - RED
Radioactive. Best for use in Direct Current (D/C) applications using transformer based constant current power sources.
Best for use on non corroding steels, titanium alloys, nickel alloys, copper alloys. Good D/C arc starts and stability, medium
erosion rate, medium amperage range, medium tendency to spit.
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 risk of weld contamination
• Increase electrode life
Oxides used are primarily zirconium, thorium, lanthanum or cerium. Additions are usually 1% – 4%. These oxides greatly improve arc initiation, especially when direct current (DC) welding is employed. Thorium oxide (thoria) has been used for many years, having been found effective in terms of long life and thermal efficiency. Zirconium oxide (zirconia) has been commonly used for alternating (AC) TIG welding, normally for welding aluminum.