T i m wrote:
On Sun, 9 Aug 2020 08:15:08 +0100, "Brian Gaff \(Sofa\)"
wrote:

Yes if the casting is quite thick and is not suffering the porosity issue, a
couple of self tapping screws in a brace on the hidden side might help with
strength, ideally an angled section.
Brian

This is one of those instances where (for most of us anyway) 'a
picture speaks 1000 words'.

Not that you couldn't describe the scenario to some degree but you
would have to also describe the loads and stresses likely in the
completed chair to predict the likely result.

Cheers, T i m


But without a picture, we can make some simple statements.

Gluing pieces end-on won't work. Not strong enough.

------X X-------
/

If you add a slab of material underneath, now there are
a lot more square inches of glue working for you. But
practical issues (how armrest fastens to tubular frame)
aren't going to work out for you.

------X X-------
/ XXXXXXXXXX
----------

*******

When the armrests on the chair I'm sitting in failed,
I made new ones. The retention screws tend to
constantly loosen up. But at least I have armrests.

Paul