> I was using paper clips and it was OK, but not ideal- today I simply bent a section on each end
Forming what is, essentially, a lap-fell joint? Yes, that's a simple and effective joint.
I've been using slot & tab joints for this purpose for years, both in windshields and in drinks can burner inner walls.
Have a look at this (rather blurry) picture of such a joint in a cone clone:
The upper tab is folded in, and the lower tab is folded out. It's better if they're the other way around, to keep the upper tab outside, and thus out of the flame. Won't matter for Ti, but is beneficial with aluminium.