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August 2003

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Subject:
From:
Mike Fenner <[log in to unmask]>
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Date:
Fri, 22 Aug 2003 15:47:33 +0100
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Depending on your oven you can generate enough delta t to do this sort of
thing simply by placing boards too close together. You need enough time and
temperature over liquidus to allow the solder to flow and wet, before the
solder melts you need a profile that will deoxidise the oxide free powder to
allow it to coalesce and still retain enough activity to help the above
spread and wetting. Getting this bit wrong can produce the familiar (to
some) it hasn't melted syndrome.
When profiling therefore it is a good idea, if you didn't, to run some
loaded boards (don't have to be functional) ahead of the thermo coupled one
to simulate a loaded oven.

Regards

Mike Fenner

Applications Engineer, European Operations
Indium Corporation
T: + 44 1908 580 400
M: + 44 7810 526 317
F: + 44 1908 580 411
E: [log in to unmask]
W: www.indium.com
Pb-free: www.Pb-Free.com



-----Original Message-----
From: TechNet [mailto:[log in to unmask]]On Behalf Of Black, Paul
Sent: Friday, August 22, 2003 1:10 PM
To: [log in to unmask]
Subject: Re: [TN] Soft solder


Thanks for the advice, Werner. I didn't realize this document existed. The
original recipe was determined by running a thermocoupled assembly through
the oven and matching the time/temperature graph supplied by the paste
manufacturer. When the manufacturer made adjustments to the recipe, it was
done with the aid of a Super MOLE.

Thank you,
Paul Black
Manufacturing Engineer
Kronos



-----Original Message-----
From: [log in to unmask] [mailto:[log in to unmask]]
Sent: Friday, August 22, 2003 7:49 AM
To: [log in to unmask]; [log in to unmask]
Subject: Re: [TN] Soft solder


Hi Paul,
Are you profiling your assemblies to determine a proper oven recipe? Look ay

IPC-7530.
Just calling in your paste supplier is in many cases not sufficient.

Regards,
Werner Engelmaier
Engelmaier Associates, L.C.
Electronic Packaging, Interconnection and Reliability Consulting
7 Jasmine Run
Ormond Beach, FL  32174  USA
Phone: 386-437-8747, Fax: 386-437-8737, Cell: 386-316-5904
E-mail: [log in to unmask], Website: www.engelmaier.com

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