Thanks for the info. My knowledge base = exactly what was posted above, and not a bit more.
Literally, I was working with a machinist on a different project--"not so DIY outside corner brackets", and I mentioned how I could put together an inside corner bracket with 2 pieces of stock angle aluminum. A local company could TIG weld that for me for $80/hour. But this machinist mentioned that I could try soldering brass. I had some solder for volt mods, I had a plumber's torch for plumbing, I found some angle brass, and so I gave it a go!
With my batch, it seems plenty sturdy as is. By design the corner brackets aren't really load bearing--the solder joint really is for resisting torquing and separation. I guess we'll see when I put together a frame.
So, then, you recommend silver solder for the next batch?
ps. Honored for the front page!