Harris® ER90S-B3 1/8" Dia X 36" Low Alloy Steel TIG Welding Rod comes in a 10 lb tube. Welding rod is used for welding 2 1/4 Cr - 1 Mo steels and for high temperature high-pressure piping as well as pressure vessels. It is ideal for joining dissimilar combinations of Cr-Mo and carbon steels.