Hobart SDX S1-EL12 description: SDX S1-EL12 is a copper-coated, carbon-steel, solid wire for submerged arc welding. SDX S1-EL12 has a low manganese and silicon composition, and is well suited for use with manganese and silicon-alloying flux(es). Hobart recommends using this wire with the following flux(es): SWX 110. 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 (part numbers ending in "H"), and others exclusive to customers outside of North America (part numbers ending in "0").