Agree with Seanick about the arc welder - I bought my stick welder for less than £60 from Amazon, and it came with gauntlets and a face shield (albeit a fixed tint one that I quickly replaced with an arc activated type).
It worked a treat repairing my chassis and modifying my frame, it took a little getting used to but within an hour or so I was getting strong, deep welds. It was a bit trickier welding the thin stuff - there's a fine line between insufficient power so no arc and too much so you just blow holes in the job - but I was able to weld in my new floorpans after a bit of practice.
Try one of these for welding on the cheap -
http://www.amazon.co.uk/Silverline-6...9620314&sr=8-1
http://www.amazon.co.uk/Silverline-4...9620314&sr=8-2
Good luck, welding's not as hard as the experts make out so have fun.
