mig question (not enough heat?)

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I tried to mig a 1/4" plate, mild steel to a 3" cold roll, round.   the weld bead was balling up, almost as if it wasn't penetrating very deep.   I was using .035 wire FCAW process.  Maybe more juice??? Thanks!!!
Reply:Did you preheat the big one?  You had DCEN, right, using settings for 1/4 - 5/16" steel?Keep most of the heat on the big piece and wash it into the thinner.The only other thing I can think of is it might be a Lincoln....
Reply:Originally Posted by irocMaybe more juice??? Thanks!!!
Reply:I did preheat but I believe I was running too cold.  ya ya ya Mac702, it was that Lincoln again.   Thanks guys...