Thanks Ralf for the detailed info. The Rothenberger kit really seems to be for smaller tasks than building a recumbent frame.
Torben Scheel once brazed his python: http://www.scheel.net/HPV/Python/default.asp
Brazing is suitable for skilled persons. You have to be very accurate and need a lot experience with the right temperatures.
Arc welding is way easier and faster. With tubing walls of 1.5 mm the frame will be rock solid and the seams won´t break even if your welding is bad.
My personal opinion:
Stick welding is too coarse for my taste MIG or MAG welding with wire feed is easiest Oxyacetylene welding can be very precise but needs some skill TIG welding is state of the art (I wish I had one)
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