Hobart SDX S3MoTiB description: SDX S3MoTiB is a copper-coated, low-alloy, solid wire for submerged arc welding. The wire is micro-alloyed to provided improved mechanical properties in high-dilution, multi-wire welding of carbon and non-alloyed steels. SDX S3MoTiB is commonly used in conjunction with SDX S2Mo-EA2 wire.