Bonding Aluminum 7075

Check out HTS 2000 aluminum brazing.Low temp, high strength brazing.

HTRN

Why braze, why not glue?

High temperature (150 to 170°C) curing epoxi with residual elasticity would do!

Do not exceed 170°C for more than 2 hours else you will change the temper status of the 7075.

RHABE

GA as thats exactly what I woould do, after really intimate cleaning and slight roughening of the two surfaces to be glued.

Would Durafix do it? I've used this with a propane torch & it produced a joint as strong as the parts being joined. The braze temp is well below your material limit.

I guess I should have added that antifreeze will be flowing through these, so there can be no leaks. I will be pumping the antifreeze at 20LPM. I haven't found a suitable glue that will handle the temperature change that I put this through. From the cold of Michigan winters to the heat of the summer. Glues that I have found won't handle the temp swings.

Thanks for the replies.

Quality epoxy, check the maker's specs before buying.

This from a recent NASA bulletin;

A truly remarkable, innovative epoxy adhesive, sealant, and protective coating has gained widespread acceptance for service at cryogenic temperatures. Master Bond EP29LPSP not only functions at temperatures as low as 4 degrees K, but also withstands cryogenic shocks (i.e., from room temperature down to liquid helium temperatures in a 5-10 minute time period). Additionally, it meets NASA low-outgassing requirements.

Might be worth checking out their products.

You might think about laser or e-beam welding around the perimeter of these pucks, but why not treat them as you would a pipe flange, and either bolt or clamp them with an O-ring between them?