I've been working on a big project with my IMig 200 and the welder started acting real funny after a few hours. I took everything apart checked the drive tensions and the gas output to no avail. I gave up for the night and started cleaning up the space and realized that my dad stuck one of my heavy duty magnetic clamps to the back of the piece that I was working on. I popped it off and gave it another shot and everything worked as it should! Sometimes it's the simplest things that cause you to lose the most time. I now know the sound and will be an easy fix in the future. Other than that I just made it through 2 lbs of wire in about three days of working and started my first 10 lb roll. I'm really liking the IMig!