Evenin' all. Having mucked around with my Toolex 160N Dual Purpose MIG for a few months, not knowing what I was doing, I have stumbled onto this very practical site. Thanks for all the newbie advice on MIG welding - I now have a better idea of where to start ( So, when using gas, the gun goes on the +ve terminal and the earth on the -ve? Who would have thought.....? It made all the difference when I tried that out. ) I hope to learn a great deal more in the coming weeks and months. KAYEM