On Sun, 22 Sep 2013 21:28:58 -0400, Ecnerwal
wrote:

In article ,
Tim Wescott wrote:

This is out of curiosity:

How good of a bond can one achieve with epoxy to aluminum? How good can
one achieve with epoxy that ordinary folks can mail-order, vs. what folks
who have the ear of a Locktite sales rep and applications engineer can
achieve? How good can one achieve with JB Weld?

Armstrong A-12 is moderately available to the determined consumer last I
checked. Has the interesting property of variable hardness with mix
ratio. I stuck together some serious stuff with it that couldn't be
bolted for electrical reasons, and was then subjected to serious forces
by electro-magnetic means, back when Ronnie was Ray-Gunning. Of course,
the Mech-E specified the areas of the joints to be sufficent. Heat cure
or a LOT of patience (= heat cure.) 5KSI at 1:1 mix.

Plastic titanium (Devcon) supposedly can do 18KSI. Probably compressive.
Nah, they lowered the claim to 15K since I bought mine, and it's only 2K
tensile/shear.

Plastic aluminum (liquid, also devcon) 2.7 tensile shear, 9Ksi
compressive - paste a bit worse.

A-12 is winning so far.

Possibly an "aluminum solder" would be better - I'm not sure. The "high
strength" stuff is basically zinc, but I've struck out finding a tensile
strength for zinc so far.

http://www.belmontmetals.com/datasheets/L-1014.pdf

Hm - the tensile strength for this process I did find some data for and
Al-Al joints is under 1KSI, but that's Sn/Ag solder.

http://www.superiorflux.com/papers/D...lder_Paste.pdf

Perhaps give A-12 a try.

http://www.ellsworth.com/armstrong-a...50ml-mixpac-ca
rtridge/?gclid=CKrblpuu4LkCFZSd4Aod-CYAXg


A4 Metalset is speced for aviation uses. It looks like JB Weld..but
is supposed to be much tougher.

I installed a Night Sun on a Ranger helicopter and used A4 for most of
the cockpit attachments




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Each worn-out label is replaced by another which raises hopes of an ultimate solution of the insoluble basic
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The most recent slogan is "State Capitalism."[Fascism] It is not commonly realized that this covers nothing more
than what used to be called Planned Economy and State Socialism, and that State Capitalism, Planned Economy,
and State Socialism diverge only in non-essentials from the "classic" ideal of egalitarian Socialism. - Ludwig von Mises (1922)