Oerlikon Inertrod 22 9 3 description: INERTROD 22 9 3 is a W 22 9 3 N L / ER 2209 type solid TIG welding rod depositing a low C 22Cr 8Ni 3Mo weld metal. Suitable for use mainly with Ar shielding gas. INERTROD 22 9 3 is used for the welding of duplex stainless steels in a range of applications including the fabrication of pipe and plate. The weld metal has a PREN value >35 giving a high resistance to pitting and stress corrosion cracking especially in high chloride media. The weld metal nickel content over matches the parent material by 2-3% to provide an optimum balance of austenite and ferrite in the as welded condition. For special request INERTROD 22 9 3 is available with TUV approval. TIG rod for welding Duplex two-phase steels. The excellence of corrosion resistance and mechanical strength by the deposit depend a great deal on the welding technique that is employed.