Hobart SDX S2Ni2-ENi2 description: SDX S2Ni2-ENi2 is a copper-coated, low-alloy, solid wire for submerged-arc welding. The nominal 2% nickel weld deposit chemistry provides excellent low temperature impact toughness, and is suitable for joining a wide range of low-alloy materials. Hobart recommends using this wire with the following flux(es): SWX 150.