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@Sam_Doman
Yeah. Welding is one of the most useful things ever. I've made frames using tig and brazing before, and I'm making a street luge frame at the moment.
Here's a picture of a trials bike frame I made for my A level tech project:
http://www.trials-forum.co.uk/gallery/1193182514/med_gallery_13468_1764_17151.jpg
http://www.trials-forum.co.uk/gallery/1206793351/gallery_13468_1764_60166.jpg
http://www.trials-forum.co.uk/gallery/1206793351/gallery_13468_1764_156709.jpg
And to prove it worked!
http://www.trials-forum.co.uk/gallery/1206793351/gallery_13468_1764_49332.jpg
It was fillet brazed from butted 4130 tubing. Rode pretty nicely, but was a bit on the heavy side for competition stuff.
Buy your own welding kit and do it in your back garden, it's the best investment you'll ever make!