Hobart SDX 2209 description: SDX 2209 is a duplex stainless steel solid wire primarily used for submerged arc welding 2205 and similar grades of duplex stainless steels. Hobart recommends using this wire with the following flux(es): SWX 220. In an effort to best serve the packaging needs and requirements of our customers globally, this product has part numbers exclusive to customers in North America, and others exclusive to customers outside of North America (part numbers ending in "0").