Which electrode is suitable for TIG welding stainless steel?

In TIG welding stainless steel, the use of a 2% thoriated tungsten electrode, identified by the red color code, is very common and effective. This type of electrode is favored for welding stainless steel because it provides excellent arc stability and superior performance at higher temperatures, which are common in stainless steel welding applications. The thoria additive improves the electrode’s conductivity and enhances its ability to maintain a clean arc, which is crucial for achieving high-quality welds in stainless materials.

The red-coded 2% thoriated tungsten is particularly suited for alternating or direct current welding, making it versatile for different stainless steel grades. It can withstand the thermal environment and helps in producing a smooth, stable arc, which is essential for precise handling during TIG welding.

Other electrodes may not perform as optimally on stainless steel due to various factors, such as conductivity or thermal characteristics. Pure tungsten, for example, is less versatile and often prefers AC applications, making it less suitable for stainless steel welding in many cases.