Hobart SDX S2Ni1-ENi1 description: SDX S2Ni1-ENi1 is a copper-coated, low-alloy, solid wire for submerged-arc welding. The nominal 1% nickel weld deposit chemistry provides good 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.