What factor primarily influences the size of the tungsten used for TIG welding stainless steel?

The thickness of the material being welded plays a crucial role in determining the size of the tungsten used for TIG welding stainless steel. When welding thicker materials, larger tungsten electrodes are typically required to handle the increased heat and maintain a stable arc. A larger tungsten provides a larger current-carrying capacity, which is necessary to achieve the necessary penetration and fusion when dealing with thicker sections. Conversely, for thinner materials, smaller tungsten electrodes are sufficient, as they deliver lower heat input, reducing the risk of warping or burning through the metal. Thus, the relationship between material thickness and tungsten size is essential for achieving optimal welding results and maintaining control over the weld process.