I really cant remember any spefic welds of mine that where bad. I usualy tend to make worse welds when I am really trying hard or being tested by friends. One weld that I made that turned out horrible was during trash formations 2008, I was welding a giant rebar lizard and a piece of rebar that was under loads of stress snaped right next to my neck ( it came within inches of slicing open my neck!). Well it scared the living $#!@ out of me, and that obviously caused me to mess up the weld I was working on.

P.S. All of my welds are strong besides the killer bar that snapped!