Hi there,
Thanks for all the replies.
It seems like oxy acetylene would be the way forward, as I don't see myself investing large sums of money in TIG.
I'm thinking about making a pulsejet, so silver solder is probably out of the question. These engines glow red/orange when running and after some brief reading, it seems like the temperature is very close to the melting temperature of silver solder and I'd rather not have bits of molten solder (and then large steel tubes...) being flung out the tailpipe.
Thanks again
Warren