Which type of tungsten is best used for welding stainless steel?

The use of E3 2% thorium tungsten for welding stainless steel is advantageous due to its properties that enhance arc stability and improve the quality of the weld. This type of tungsten electrode has a small percentage of thorium added, which provides a higher current-carrying capacity, increased electron emission, and a more stable arc. These characteristics are crucial when working with stainless steel, as they help maintain precise control over the welding process and minimize heat input, thus improving the integrity of the weld.

Additionally, E3 2% thorium tungsten electrodes can withstand higher temperatures than pure tungsten, making them suitable for a range of welding applications, including those requiring a high level of skill and precision. This allows welders to tackle stainless steel with greater proficiency, especially in critical joints or intricate designs where heat management is essential to prevent warping or discoloration.

While pure tungsten electrodes can be used for some welding applications, they lack the performance benefits that thorium provides, particularly for stainless steel. Other types of tungsten, while effective in certain contexts, do not offer the same efficiency and control as E3 2% thorium tungsten when welding this specific material.