THE WELDER DUDE:
He could probably explain this better but to put it into 'English'......
You can get different types of welder.....Arc, TIG, MIG and probably some others i dont know of. Anyway....Welder works by creating an electric circuit and therefore supplying a certain amount of current to the metal piece you are welding (you choose the amount of current using a switch on the welder), the current melts the metal and allows it to form a very strong metallic bond between the two bits you are welding together when it solidifys again. MIG welding is better for doing jobs with thinner metal, you are less likely to weld a hole into your piece of metal and if your good at it, it will leave a reasonably neat weld.....ALTHOUGH WITHOUT PRACTICE YOU PROBABLY WILL STILL MANAGE TO RUIN YOUR JOB EVEN WITH A MIG WELDER!!!
Maybe this is in less english than him, im no welding expert but hope it helps a bit!
Have a look at
www.screwfix.co.uk they have MIG welders for a reasonable price, or else buy one off ebay or something!
Welding is fun, id give it a go if you had the money, dead handy for fixing loads of stuff!:-)
L.