Oerlikon Inertrod 347 description: INERTROD 347 is a W 19 9 Nb/ER 347 type solid TIG welding rod depositing a niobium stabilised 19Cr 9Ni weld metal. Suitable for use mainly with Ar shielding gas. INERTROD 347 is used for the welding of 321 and 347 grade stainless steels in a wide range of applications, including the fabrication of pipe, plate and vessels. The weld metal has a high resistance to corrosive media at service temperatures <400C. The presence of niobium reduces the possibility to intergranular chromium carbide precipitation and thus reduces to susceptibility to intergranular corrosion. TIG rod for welding stabilized stainless steels. The presence of stabilizers improves corrosion resistance. Used when welding AISI 347 and 321 steels.