Which type of filler metal is commonly used in GTAW for stainless steel?

The type of filler metal commonly used in Gas Tungsten Arc Welding (GTAW) for stainless steel is ER308L. This filler metal is specifically formulated for welding austenitic stainless steels, which are known for their excellent corrosion resistance and high-temperature strength. ER308L is ideal as it offers good mechanical properties and corrosion resistance in the weld area, ensuring that the welded joint maintains compatibility with the base stainless steel material.

In GTAW, using the appropriate filler metal is crucial for achieving optimal results, including adequate strength, ductility, and resistance to corrosion. ER308L is widely accepted for its versatility and effectiveness in various applications involving stainless steel.

The other filler metals listed serve different purposes; for example, ER4047 is typically used for welding aluminum-silicon alloys, ER70S-6 is intended for carbon steel applications, and ER5356 is used primarily for welding magnesium alloy. Thus, ER308L stands out as the best choice specifically for stainless steel welding in GTAW processes.