[davidimurray]

Well I do like to throw a few wild ones out in the mix. These aluminium brazing products seem very interesting. Doing a bit of research - it seems they have been used quite succesfully to build intake manifolds - quite impressive really when you consider the weight hung on them. Looking round a bit further, over on the mig welding forums, there is an example there of using it to fix a pipe into a plate that is subject to 28 inches of vacuum!

Having spent a bit of time making boilers that were silver soldered together, this seems like quite a similar process to me - but made to suit aluminium.