The 3% Mixed Oxide Tungstens are universal for use on both AC & DC Tig Welding. They offer many benefits compared to other Tungsten Styles such as: * Increased Arc Stability. * Reduced Burn Off. * High Current Capacity. Engineered to exact specifications, you can count on these long-lasting electrodes to perform during your most difficult welding application. With reliable arc-striking and a low burn-off rate, these electrodes maintain the highest quality of arc while adhering to ANSI and American Welding Society standards such as AWS A5.12M/A5.12:2009 Class EWG.