Flux Core Welding wire provides a self-sheilding flux cored wire used for welding carbon steels. Flux core welding wire common numbers are E71T-GS, E71T-11, This product would require no shielding gas and some,such as E71T-11, can be used in limited mulit-pass welding operation while the E71T-GS is for single pass applications only.. All self shielding welding wire is to be used on DCEP (Strait Polarity). Please take a look at the full line of high quality Flux Core Welding Wire below.