Wonder whether those nice people at the EU worked out how to solder to
aluminum using anything lead free??

Can it be done?

John Burke

(408) 515 4992

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Dave Dixon
Sent: Wednesday, October 29, 2008 2:17 PM
To: [log in to unmask]
Subject: Re: [TN] Soldering to Aluminum?

Sounds funny.  The flux is "compliant", but they suggest that you use it
with tin/lead solder.


-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Phil Nutting
Sent: Wednesday, October 29, 2008 10:35 AM
To: [log in to unmask]
Subject: Re: Soldering to Aluminum?

Pete,

Seems to me there was recent thread here on something similar.  We have
soldered to stainless steel and I think the process is similar for
aluminum.  It has to do with the flux used.  Word of caution... I
believe it is an acid based flux so how it is applied and washed off may
be of concern.

From McMaster-Carr website:

Aluminum Soldering Flux

Use this paste flux with aluminum solder and any tin/lead solder to
solder aluminum and aluminum alloys. Also for use with copper, chrome,
and brass. Meets DOD 1866 and is ROHS compliant.
4-oz. Jar 7696A2   Each   $9.65
1-lb. Jar 7696A1   Each   $30.41

 I have not tried it.

Phil Nutting


-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Pete Houwen
Sent: Wednesday, October 29, 2008 10:01 AM
To: [log in to unmask]
Subject: [TN] Soldering to Aluminum?

Has anyone tried soldering lead free to an Aluminum circuit on
polyester?

We are looking at a very simple one component circuit that needs to be
on a material with some flexibility.  We do run millions of feet of
aluminum on polyester passive circuits in one of our plants.  I am being
asked to see if we can take advantage of the in house production to save
some cost.

My other thought is to just try a conductive adhesive, but we might need
to do some tooling for that, as this would require about 3 million of
these circuits/year.

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