What is the nominal percentage of thorium oxide in a red tungsten electrode?

The nominal percentage of thorium oxide in a red tungsten electrode is 2%. This type of electrode is specifically formulated for its unique properties that enhance welding performance. Red tungsten electrodes, which contain thorium oxide, are known for their ability to provide a stable arc, excellent current carrying capacity, and their durability in a variety of welding conditions.

Thorium oxide is added to tungsten to improve its performance, especially for AC (alternating current) applications. The 2% composition allows for a balance between the physical characteristics of tungsten and the enhancing effects of thorium, providing arc stability while also allowing for easier starting and a longer service life compared to non-thoriated electrodes. The addition of thorium also helps in the improvement of the electrode's resistance to contamination, which is crucial in producing high-quality welds.

Understanding the nominal composition is vital for welders, as it informs their choice of electrode based on the specific needs of a welding project and helps them achieve the best possible results.