i'm still a relative noob regarding mig welding (well all welding tbh) i recently bought a used clarke 90pro and have been playing with it in the shed. the other day i was practising on an old car bonnet and the welds were rubbish compared to what i was doing when i first started a few weeks back. then i realised the small bottle of co2 that came with the welder had ran out. so i fitted a new bottle of argon mix and wow what a difference. it seems so much easier now 
