I have tried gluing / bonding aluminium in the past, with mixed results.
I use an epoxy resin, of the Araldite type, clean & abraid the area (to remove oxide), apply resin, leave to set.
Sometimes it works fine, others it fails. The joints aren't stressed, they tend to be small boxes etc. Often as not, the resin is more to fill a gap/seal than 'hold together'.
There seems to be no obvious reason for the times it doesn't work.
I need to join/seal some very thin aluminium (paper type thickness). Again, no real stress, but a seal is required and the join will be exposed to mild heat ( you could touch it but probably wouldn't want to).
I've found some resin, JB weld, which is rated for high temperature but how do I improve the likelihood of the joint 'taking' in the first place. The joint will be close fitting, as good as clamped until the resin is set.