A bit hard to say without some more info (or pictures). But as a rule of thumb, pretty much any slow curing (24h) epoxy should do a good job. Make sure to clean the joint surface well (possibly with alcohol/acetone) prior to gluing. Roughing up the surface with something like 80 grit sandpaper would be a good idea, too. Secure the joint with clamps if at all possible. Do not tighten the clamps too much, just enough to achieve a good fit, then leave well alone for the next 24h.

That said, I'm not sure I would use glue in your situation. In all likelihood bolts would be mechanically stronger and you can always disassemble them for repair if necessary.