Hobart SDX S3Mo-EA4 description: SDX S3Mo-EA4 is a copper-coated, low-alloy solid wire for submerged arc welding. The manganese and molybdenum content of this wire makes it a suitable for joining low-alloy materials of a similar composition, as well as application requiring consistent mechanical properties before and after post-weld stress-relief. Hobart recommends using this wire with the following flux(es): SWX 130, SWX 135.