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Registered Member #1225
Joined: Sat Jan 12 2008, 01:24AM
Location: Beaumont, Texas, USA
Posts: 2253
I am trying to make a small circuit board, for connecting my computer's sound card to my scope, in a more reliable, shielded, and permanent way.
Well, this requires that i solder the coaxial cable's aluminum shielding to a circuit board. I have tried using a 30w soldering iron and a huge amount of flux, i have tried using a pencil torch with a ton of flux, and each time the solder still drops off. I have had better luck soldering to cold steel.
Is there some crazy way to get solder to stick? It there another method i should use? I am really trying to avoid terminal blocks, that would just increase capacitance or inductance and make things ugly. Though, that is my last resort.
Registered Member #190
Joined: Fri Feb 17 2006, 12:00AM
Location:
Posts: 1567
why don't you bring some of the shielding together to form a cord, crimp it with a crimp connector to some multistrand copper wire? now you can solder the wire to the board.
Registered Member #2028
Joined: Mon Mar 16 2009, 08:13PM
Location: Norway
Posts: 319
Um, i dont know if this is true for soldering, but if you are going to weld aluminium you first have to rub off the oxide layer that forms on its surface. It could be this oxide layer that is causing you trouble.
And i am sure you are aware that aluminium is an exellent heat conductor, so you will need a lot of heat.
Iv tried soldering aluminium with soldering irons and a blowtorch, neither worked. Forming the shielding into a thread and crimping it is your best option.
Registered Member #72
Joined: Thu Feb 09 2006, 08:29AM
Location: UK St. Albans
Posts: 1659
Soldering aluminium is easy (relatively), or at least possible with care, just follow these two steps.
a) buy "aluminium solder", this is an alloy something like regular solder, but cored with a seriously corrosive flux b) follow the instructions to use it - heat the alli, then touch the multicore solder to it. If you heat the solder first, the flux dissapears in an ineffectual fizz, and there's none left by the time the alli is up to temperature.
I find it's easier to make the joint in 2 steps, first "tin" the alli, then make a regular soldered joint between the tinned alli and your copper wire.
IIRC, it needs a higher temperature than regular solder, so soldering the braid of coax may not be such a good idea as it could melt the dielectric, clamping may be better.
Registered Member #543
Joined: Tue Feb 20 2007, 04:26PM
Location: UK
Posts: 4992
I agree with Dr Slack: if you buy flux-coated aluminium brazing rods, you should have no problems beyond the ceiling of your own experience. But this doesn't sit so well with your "small circuit board." Unless it's some kind of critical application, why not make your connections with nuts and bolts, or redesign the circuit till it will accept this kind of approach?
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Soldering aluminum wire? (Resolved)
