https://www.alumiweld.com/

is one brand, but most local welding shops will carry some version of the stuff. I used it to braze my intake tubes to  1/4" plate, but I have no idea whether it will stand up to the intake pulses & vibration with the engine running. I can tell you that the stuff isn't the magically easy to use stickum that it seems to be, when you're watching the carnival barker at SNF. The stuff I used was marginal on thick stuff with a propane torch (might not be a factor with the heat exchanger). You'll almost certainly need a wood handled stainless steel brush to free the corrosion on the base metal while the torch is applied to the molten brazing material.

 

Have you thought about hitting Barry up to take a look at it? ;-)

 

Charlie

On Mon, Feb 22, 2021 at 3:04 PM Finn Lassen finn.lassen@verizon.net <flyrotary@lancaironline.net> wrote:

Some time ago Ed Anderson recommended some (rather expensive) DIY alum
welding or brazing rods that he had good success with.

I really need to add some alum tubing to the ends of the evaporator core
tanks (and close off the existing tubes going into the tank sides).

I'm worried that If I try to do that myself that I will disturb (weaken)
the existing core brazing/welds.

I assume that if I take them to a (Tig?) welder he'll be able to do it
so heat won't spread (or maybe submerged in water)?

Any advice?

BTW, I'm now unable to find the exact same cores on eBay and would
rather avoid having to re-do the fiberglass inlet ducts. So I'll have to
take the plane out of service to do it and to not mess up the cores.

Finn


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