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I realise this is an old thread but I have a question-the welds shown at 3rd/4th pics down appear to have slag on them? the OP said he was using Argoshield light-I was under the impression mig with gas produced a weld with no slag?
It's not really slag as such, it's the silicates that come out of the weld metal and settle on the surface.




Thankfully there was no damage to the machine, it just needed a good clean out.