I recently bought some .030 flux wire made by Lincoln with an alloy no. of E71T-11. It was to replace some US Forge flux wire E71T-GS. They both worked, but the Lincoln stuff was much better. The arc was more stable. The bead was flatter. The penetration seemed a lot better. MY question is why was this? The Lincoln wire worked well enough for me to not just reserve Flux core for times when my tank is empty.