Tungsten electrodes are used in Tungsten Inert Gas (TIG) welding and plasma cutting. They are made of non-consumable tungsten and are used to create an electric arc for welding or cutting applications. Tungsten electrodes are known for their high melting point, stability, and resistance to erosion, making them suitable for use in high-temperature and high-current applications. Different types of tungsten electrodes are available, each with specific properties and suitable for different welding applications.