Oerlikon Inertrod 347Si description: INERTROD 347Si is a W 19 9 Nb Si/ER 347Si type solid TIG welding rod depositing a 19Cr 9Ni niobium stabilised weld metal. Suitable for use with Ar shielding gas. INERTROD 347Si is used for welding of 321 and 347 grade stainless steels and is used for 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 the susceptibility to intergranular corrosion. The increased silicon content promotes weld pool fluidity resulting in a smooth weld deposit.