Which electrode is recommended for TIG welding aluminum?

The recommended electrode for TIG welding aluminum is pure tungsten. Pure tungsten electrodes have a high resistance to contamination and provide a good arc stability, which is essential when working with aluminum. This type of electrode can handle the heat better and allows for a cleaner and more precise weld since aluminum requires a specific technique that can benefit from the properties of pure tungsten.

Other types of tungsten, such as thorium or lanthanum doped tungsten, are more suitable for welding other materials like steel or nickel alloys due to their increased longevity and durability under certain conditions. However, for aluminum, pure tungsten is preferred as it produces a stable arc, minimizing the risk of tungsten contamination in the weld pool, which is particularly important for achieving a high-quality aluminum weld.