What is the AWS classification for stainless steel filler rod?

The classification for stainless steel filler rod in the American Welding Society (AWS) standard is designated as ER308L. This designation indicates that the filler rod is specifically formulated for welding austenitic stainless steels, such as type 304, which is commonly used in various industries due to its excellent corrosion resistance and mechanical properties. The "ER" prefix stands for "electrode, filler rod," followed by the specific alloy designation, which in this case, "308L" signifies a low carbon content version of the 308 alloy. This low carbon content helps in minimizing carbide precipitation during welding, thereby improving the corrosion resistance of the welded joint.

In contrast, the other options represent different materials or alloy compositions. ER4043 is primarily used for aluminum welding, ER70S-6 is a filler rod for carbon steel, and ER5356 is an aluminum alloy filler rod as well. Each of these filler rods is suited to its respective base materials but does not apply to stainless steel applications like ER308L does.