Bandit Well ,,,ya ,,,you could try some more passes 2 more at least,,,,,,,,,but really,,,you need a larger welder,,,and when you are done it should look like Vee shaped fish scales (single pass only)and looking at the brown haze on the metal,,,,do you know if that was a flux core welder,,,or does it have a gas tank kit ,,,,if its flux then again you need to clean slag (brown crud) every time you make a pass. I`ve welded some thin stuff (sheet metal) and some thick plate around the farm,,,the 3/8 and 1/2 inch plate sucks up the heat,,,,any time you see the weld Mound up when you welding in a corner its too cold,,,it should look like a nice curved transition from one metel to the other..1/4 wall is pushing it for a small welder.it just takes practice,,,and learning how to move in each position, with small zig zag or circle 8`s...