Hobart SubCOR SL 735 1W description: SubCOR SL 735 1W-5W is a specially formulated cored wire intended for single or two-run submerged arc welding using 1 wire. The wire chemistry of SubCOR SL 735 1W provides amounts of micro-alloys specifically selected to best counteract the formation of coarse microstructures. This promotes good impact toughness, even when welding on thick materials at high travel speeds and deposition rates.