Hobart SDX S3TiB description: SDX S3TiB 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 S3TiB is commonly used in conjunction with SDX S2Mo-EA2 wire. Hobart recommends using this wire with the following flux(es): SWX 130, SWX 135.