Oerlikon Inertrod 318 description: INERTROD 318 is a W 19 12 3 Nb/ER318 type solid TIG welding rod depositing a C-19Cr 12Ni 2.5Mo niobium stabilised weld metal. Suitable for use mainly with Ar shielding gas. INERTROD 318 is used for the welding of 316Ti and 316Nb stainless steels in a wide range of applications including the fabrication of pipe, plate and vessel. The weld metal provides good resistance to crevice corrosion by oxidising acids.