Welding is one of the most important steps in steel production, and prior to discussing it, it is important to have a clear understanding of its meaning. Welding is a process in which two or more pieces of metal are permanently joined together, with or without the use of a filler material.

When welding stainless steel it is important to consider the material’s mechanical resistance. Various phenomena occur when welding stainless steel, which are important to be aware of to ensure that a proper fusion take place. The main property of stainless steel is that of passivation, which is the formation of an invisible layer on the metal’s surface which causes it to lose its chemical reactivity and protects the steel from further oxidation.