.035 flux core welding wire for MIG welders. E71T-GS alloy is a high strength flux core wire which produces a deep penetrating weld without shielding gas. Tensile strength 80,000 PSI. No shielding gas required, but 75% CO2/25% Argon (C-25) will reduce spatter. Machine polarity DCEN straight polarity (MIG DC -). 2# spool.