Be careful, without protective coating the solder pot life length, will be
smaller.
Best Regards
Reuven ROKAH
e mail: [log in to unmask]
"Schaefer, Chris"
<Chris.Schaefer@S
UNTRONCORP.COM> To
Sent by: TechNet [log in to unmask]
<[log in to unmask]> cc
Subject
12/12/2005 16:47 Re: [TN] Preparing Solder Pot for
Lead Free Processing
Please respond to
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<[log in to unmask]>
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"Schaefer, Chris"
<Chris.Schaefer@S
UNTRONCORP.COM>
Thank you very much. I contacted our local Speeline/ Electrovert rep. and
they did not mention this process whatsoever - interesting eh? It is nice
to know that there is this forum in which there is much knowledge to be
learned.
Thanks again everyone.
CAS
-----Original Message-----
From: TechNet on behalf of Cheryl Tulkoff
Sent: Mon 12/12/2005 8:16 AM
To: [log in to unmask]
Cc:
Subject: Re: [TN] Preparing Solder Pot for Lead Free
Processing
Chris -
We cleaned an existing tin/lead cast iron solder pot
(Electrovert) and
converted it to lead free with excellent results - verified by
analytical
reports for various contamination levels.
We simply drained the pot, gently scrubbed and vacuumed, and
replaced all
the internal parts (pot drain valve, sumps/pumps/baffles). We
also
installed new finger brushes, conveyor chains, and fingers.
The preheaters
and housing areas were all vacuumed and wiped down as well.
Tin "wash" procedure have been talked about but they are a
pricey way to
go. They basically involve using an initial sacrificial 100%
tin bath and
redrain (recycle) before final filling with your lead free
alloy.
The procedure from Speedline is cut and pasted here:
SCOPE: LEAD FREE UPGRADE PROCEDURE
ELECTRA / VECTRA
METHOD:
1. Remove all nozzles, flowducts, pumps and all other
components
that are in the pot. Use
protective equipment while performing
this task.
2. Leave heaters on while draining solder.
3. Drain solder from the pot and scrape the sides and
bottom to
remove any solder residue and
dross.
4. This procedure will provide a
contamination level
well below the required specification as
long as the pot was cleaned properly.
5. Change the solder pot configuration to lead-free.
See the
Software Configuration Manual.
6. Fill pot with lead-free solder and allow the
solder to melt and
reach the setpoint temperature.
7. Once solder has reach the setpoint temperature
de-dross the
pot.
8. Install the new lead-free flowducts,
nozzles, pumps
and other parts in the lead-free upgrade.
The existing belts and pulleys and
covers will need
to be used. Use protective equipment when
performing this task.
9. Using the nozzle setup tools, level nozzles and
make sure the
pumps are seated.
10. Have solder analyzed to ensure lead levels are
below
specification.
Thanks,
Cheryl Tulkoff
Senior Reliability Engineer
Phone:(512) 683-8586
Fax: (512) 683-8847
National Instruments
11500 N. Mopac Expressway
Building A
Austin, TX 78759-3504
"Schaefer, Chris"
<Chris.Schaefer@S
UNTRONCORP.COM>
To
Sent by: TechNet [log in to unmask]
<[log in to unmask]>
cc
Subject
12/12/2005 07:58 Re: [TN] Preparing
Solder Pot for
AM Lead Free Processing
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"Schaefer, Chris"
<Chris.Schaefer@S
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Thank you all.
So should I do one of the following:
- Replace the solder pot altogether (the safest method, but
most expensive)
- Clean the existing cast iron pot as best possible then fill
with Pb Free
solder (higher risk, but less expensive)
If anyone has cleaned their existing cast iron solder pot,
then how did
you do it exactly? Is there a proposed method for doing this
somewhere out
there?
Any suggestions would be very helpful.
CAS
-----Original Message-----
From: [log in to unmask]
[mailto:[log in to unmask]]
Sent: Fri 12/9/2005 11:10 AM
To: Schaefer, Chris; [log in to unmask]
Cc:
Subject: Re: [TN] Preparing Solder Pot for Lead
Free
Processing
Hi Chris,
Pb left in the old 'pot' may not be your biggest
problem--look
at these pics.
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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