Robin2:
Just remembered seeing some guy at a model engineering exhibition selling a special sort of "solder" that worked exceptionally well with aluminium to aluminium joints.I'm not sure if it was actually solder or some sort of catalyst that facilitated a form of welding.
Sorry, can't remember what it was called. It was expensive per metre,
Yes I saw that at the Harrogate model engineering show about four years ago. It was £32 per meter, but I can’t remember what is was called either.