10PK TIG 2% Thoriated Tungsten Electrode Rod WT20 1.6mm 1/16"x7" 175mm Stainess Steel Welding Red Tip WT20 2% Thoriated Tungsten Electrodes For TIG Welding. AC welding: thin-gauge aluminum and material less than 0.060" DC welding: Carbon steel, stainless steel, nickel, and titanium. 10pcs 1.6mm*175mm WT20 Tungsten electrode Red tips