...but I've been practising with my new MIG for an hour or so for past three nights and thought it was coming on OK. I'm using the gas (CO2) bottle supplied and hence it has no guage. Thought I'd check if there was any still in by putting upside down in water. Turned tap to 3 as advised on instructions - nothing. Turned up to 5 and audible hiss and BUBBLES!!. Thing is, I've never had it past 3 whilst welding and never heard it hiss before (didn't know it should!). Is it safe to say all my practise has been gasless? If so - is burn through and brown powdering no surprise? Please don't use the phrase 'common sense'!!