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Subject:
From:
Reuven ROKAH <[log in to unmask]>
Reply To:
TechNet E-Mail Forum <[log in to unmask]>, [log in to unmask]
Date:
Mon, 12 Dec 2005 16:56:39 +0200
Content-Type:
text/plain
Parts/Attachments:
text/plain (259 lines)
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
              TechNet E-Mail
                   Forum
             <[log in to unmask]>
             ; Please respond
                    to
             "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


                          Please respond to
                           TechNet E-Mail
                                Forum
                          <[log in to unmask]>
                          ; Please respond
                                 to
                          "Schaefer, Chris"
                          <Chris.Schaefer@S
                           UNTRONCORP.COM>






             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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