Any welders on the board?

I think you need to get the weld really glowing and rite before the point were the pool of hot glowing metal would fall, that is when you need to cut the juice and let it cool. it takes practice but you'll get it. one more way to tell if your doing a good job is to look at the back side of the weld( if you can see it) and see if you are getting good penitration. It should look burnt and you should be able to see exactly were you were welding (if you can see the back side of the weld that is).