I have a heap of old bike parts and so wanted to use these as much as possible, at least until the machine proves to be functional. All of the welding is done with a MIG and I have little idea of what other methods one can use. There are really only 2 main parts to the whole frame being the main body and the seat. Main Body I first started by bending and then tack welding the rectangular tubing for the frame. It is best to have the front wheel in place to be certain of the correct spacing as this will weld up to be quite strong and is hard to correct later.
Extra tubing is added near to the wheel bolting position for strength.
I cut a slit in the end which passes over the rear part of the fork so there is more area to hold. I spent a lot of time fiddling with the angle the frame makes at the rear to get the center of gravity as low as possible and this still could do with being a little lower. I have purposely not made very much steering movement so the trike will be safer to ride. The lack of movement makes it a bit of a pain for manoeuvring but normal riding is not affected in any way. In terms of setting up the steering geometry the best information I have found says that the setup is all the same as front wheel steering but usually needs to be more finely tuned.