Just took a five day welding course, SO I'M AN EXPERT NOW . . . not. I was a stick welder 20 years ago, and didn't do too badly.
I agree that you may be trying to make your beads too long. Heat builds up and you end up with a blowout. I would also suggest that you check your gas flow rate. I was told that 15 CFM is high.
Keep in mind that I finally found an on-off switch for my brand new MIG welder, which came with a defective one, so I haven't been able to practice what I am preaching. My first jobs are probably going to be replacing floor pans and cab corners. I hope I learned something at that course.
