I was given a snap on YA212A mig machine a while back. It was in pretty rough shape so i tore it all the way down and repainted it. Put it back together and it was working good. Only problem i would have was that the switch in the gun seemed to stop working sometimes. When trigger was pulled, nothing would happen. No gas and no wire feed. Then in a few secs it would start working again. I havent used it in a few months and decided to play with it some since i bought some new tips. It is not acting right now. Its is like the arc is pulsing when welding. Ive played with heat and wire feed rate and it does not seem to change. Wire is feeding nice and smooth out of gun. Any ideas? Could it be the switch in the gun? I have done almost no mig welding with gas but seems like when it was working right i was a very green flame when welding. I am not seeing that now. Using 100% argon.
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