What is a key consideration when selecting tungsten size for TIG welding?

When selecting the size of tungsten for TIG welding, the thickness of the material is a key consideration because it directly impacts the heat required to achieve a proper weld. Thicker materials require a larger diameter tungsten electrode to handle increased current without overheating or degrading. A larger tungsten provides a greater surface area, which allows for better thermal conductivity and stability when welding thicker sections. This helps to maintain a consistent arc and produces a more reliable weld.

For thinner materials, a smaller diameter tungsten is typically used because it allows for a more focused arc and minimizes the risk of burning through the workpiece. Thus, understanding the thickness of the material being welded is critical to selecting the appropriate tungsten size to ensure effective and quality welding performance.