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September 2013

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Subject:
From:
Mike Fenner <[log in to unmask]>
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Date:
Tue, 3 Sep 2013 13:50:57 +0100
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So it is structural soldering, meaning the probability is that it was
soldered with acid flux and water washed. That would give you very adequate
wetting and uniformity of results. Not a total certainty because some nickel
platings are much easier to solder than others, but post solder flux removal
is probably done and water washing would probably be the cheapest , meaning
it makes sense to use a water sol flux. OF course there are all sorts
possibilities we could speculate on. A contrary one: it is possible a
fluxless operation was done on the bare aluminium and then it was plated.

Whether automated or not, and how much would depend on the rate of
production required and the volumes involved. Not necessarily the exact same
thing.

Regards 
 
Mike Fenner 
Bonding Services & Products
M: +44 [0] 7810 526 317 
T: +44 [0] 1865 522 663
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Victor Hernandez
Sent: Tuesday, September 03, 2013 12:04 PM
To: [log in to unmask]
Subject: Re: [TN] Solder joint failure

This is actual the actual soldiering using a copper heat tube to a nickel
plated surface.   The solder joint appears very uniform and NOT hand
soldering.   Therefore I suspect some sort of automatic soldering process.
Victor,

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Gerald Bogert
Sent: Thursday, August 29, 2013 2:41 PM
To: [log in to unmask]
Subject: Re: [TN] Solder joint failure

August 29, 2013

Appears that you are talking about soldering metals to metals and not
soldering to electrical components.  If this is true, mechanical soldering
requirements and not J-STD-001 soldering would normally apply.

Is this a soldering or otherwise a brazing operation since many heat sinks
are brazed to the copper pipes using dip braze or furnace brazed process
rather than soldered.

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Whittaker, Dewey
(EHCOE)
Sent: Thursday, August 29, 2013 3:10 PM
To: [log in to unmask]
Subject: Re: [TN] Solder joint failure

Usually a sacrificial gold is the final finish over the nickel. The fluxes
used to solder to nickel are unique. IMHO, no-cleans; not allowed.

Dewey

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Glidden, Kevin
Sent: Thursday, August 29, 2013 12:01 PM
To: [log in to unmask]
Subject: Re: [TN] Solder joint failure

In my experience nickel is NOT easy to solder to at all.


-----Original Message-----
From: Victor Hernandez [mailto:[log in to unmask]]
Sent: Thursday, August 29, 2013 2:53 PM
To: [log in to unmask]
Subject: [TN] Solder joint failure

Fellow TechNetters:

   Should I be concern with an electroless matted nickel plating over an
aluminum sheet metal surface and solder onto a copper heat tube?   I
recall something about directly soldering onto a nickel surface.  Beside
nickel oxidation.    Any suggestions would be greatly appreciated.

Victor,

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