While I'm not overly fond of the gasless flux core wire, but just like jdurand said it has its uses the thing you have to remember about it is it welds like a combination of 6011& 6013 once you learn to rock your stinger directing arc while keeping the electrode in the puddle it will yield decently strong welds.
for most of my welding I use flux core but not the gasless type I used a duel shield cored wire with CO2 mostly because much of my welding is on heavier mterials requiring deeper penetration and larger beads.
But I have 1 machine set up with solid wire with 75/25 shielding gas and 1 set up with the gasless wire There are times when the gasless makes more sense than stick welding
Never try to tell me it can't be done
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