[sdiy] Soldering copper to aluminum using indium

[Gordonjcp]

On Tue, Aug 17, 2021 at 03:59:49PM +0200, cheater cheater via Synth-diy wrote:
> 
> BTW, I know this will require a lot of power from the soldering iron,
> I have six very powerful soldering irons available, and if need be I
> can use them all at once.

I don't know about the difference in thermal conductivity, but for this bit you might want to consider getting the heatsink good and hot in an oven.  Do it slowly and let it get to an even temperature right through.

Also consider that the dissimilar metals will expand and contract at different rates, and it might just crack itself free after a few cycles of heating and cooling.

-- 
Gordonjcp