AWS A5.9 ER2209 Duralloy 2209 is a solid TIG welding rod. Duralloy 2209 is used for the welding of duplex stainless steels in a range of applications including the Fabrication of pipe and plate. The weld metal provides 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. Shielding Gas Argon