Hi! As far as I know the plumbing industry just ignores the issue! I have
seen some documented cases of plumbing failures due to dezincification but
my guess is that the solder joint sizes, amount of solder, tolerances, etc.
are such that failures are minimal. Also, quite a bit of plumbing is done
with copper and not brass piping. During a remodeling effort some time back
I saved a segment of the removed plumbing for cross-sectioning - and I did
find some evidence of dezincification in the solder joint but it had not
progressed to a point of failure (and the pipes were pretty old, I don't
think it would have ever reached the failure point).
Dave Hillman
Rockwell Collins
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rgrant <[log in to unmask]>@ipc.org> on 10/04/2002 09:39:50 AM
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Subject: Re: [TN] soldering brass to copper
So what is done in the plumbing industry? All the valves in my house that
I
soldered to my copper pipes are a brass based alloy (which soldered quite
nicely).
-----Original Message-----
From: Dave Hillman [mailto:[log in to unmask]]
Sent: Friday, October 04, 2002 7:51 AM
To: [log in to unmask]
Subject: Re: [TN] soldering brass to copper
Hi TechNet! Sorry Guy but Mike Fenner already beat me to the answer (I just
haven't been drinking enough Diet Coke lately). There are two good
references which provide additional explanation on dezincification:
Structure and Properties of Engineering Alloys, page 241, ISBN
0-07-058560-1 (this is a really good general reference on metals as a
subject), and Soldering Handbook, 3rd Edition, ISBN 0-87171-618-6, page
347. Most folks avoid having dezincification problems by using an
underplate of copper to "seal off" the brass surface from the solder.
Dave Hillman
Rockwell Collins
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Guy Ramsey <[log in to unmask]>@ipc.org> on 10/04/2002 08:02:09 AM
Please respond to "TechNet E-Mail Forum." <[log in to unmask]>; Please respond
to Guy Ramsey <[log in to unmask]>
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cc:
Subject: Re: [TN] soldering brass to copper
IPC-HDBK-001 5.1.2
Brass is an alloy consisting mainly of copper and zinc. Without a
barrier layer of copper or nickel over the brass, the zinc will dissolve
into the molten solder during soldering, Zinc contamination of the
solder joint is evident by a rough, grainy, frosty, porous surface with
a high dendritic structure. Also, solder wetting to the terminal would
be inhibited.
Wish I knew more, perhaps Dhillman would find time to comment?
> -----Original Message-----
> From: TechNet [mailto:[log in to unmask]] On Behalf Of Phil Nutting
> Sent: Thursday, October 03, 2002 3:23 PM
> To: [log in to unmask]
> Subject: [TN] soldering brass to copper
>
>
> I vaguely remember something about soldering brass in some
> recent posts. We are looking at some cooling parts that may
> require soldering brass to copper. My experience says that
> this is a non-problem. The posts that I remember said
> something about tin and crystallization. Am I mixing two
> different thoughts here?
>
> Phil Nutting
> Manufacturing Engineer
> Kaiser Systems, Inc.
> voice: 978-922-9300
> e-mail: [log in to unmask]
>
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