May be other issues but the welds in your pics look exactly like what I was trying to describe. Namely a 6011 typically gives a crappy appearing weld. Too, it penetrates deep, especially on lighter guage material, so if your a bit hot and/or running too large of a rod it's going to leave a crappy appearing, flat weld that looks like it was trying to melt all the way through. Top that off with the fact that the material you were welding on looked to be pretty nasty and you get exactly what I was trying to describe I've seen many, many times over the years from a 6011 rod.
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