Wave soldering systems today will be running between 245-250C. You can run
at 240C but that depends on board type and through put speed. For the most
popular lead free materials the temperature will run between 260-265C.
A key feature on lead free is to reduce the shorting, reduce the copper
uptake in the bath, although it is possible to drag out copper as tin-copper
dendrites. A new problem that people have had is secondary reflow of top
side joints at lower temperatures due to lead contamination. The NPL team
are doing a project on this over the next year.
Bob Willis
2 Fourth Ave, Chelmsford, Essex, CM1 4HA
Tel: 01245 351502
Fax: 01245 496123
Mobile: 07860 775858
Email: [log in to unmask]
Web: www.leadfreesoldering.com
Web: www.bobwillis.co.uk
-----Original Message-----
From: Leadfree [mailto:[log in to unmask]]On Behalf Of Romm, Doug
Sent: 20 February 2004 16:20
To: [log in to unmask]
Subject: [LF] Question on lead-free wave solder processes
All,
Please forgive me because I asked a similar question in the past, but need
further input. Here are my questions for those who have wave solder process
experience:
* From my observations most wave solder pots for SnPb solder operate with a
temperature as high as 260C, even though the solder is SnPb, not Pb-free.
If you run a wave solder process, what is the temperature of the solder in
your solder pot?
* The industry is converting to lead-free solders for wave soldering,
primarily SnCu or SnAgCu solder alloys. I believe that these lead-free
solders can be used in the same temperature range as SnPb is currently set
at today, with 260C maximum. If you run a wave solder process using
lead-free solder in your pot, what is the temperature of the solder in your
pot?
Thanks in advance for your inputs.
Best regards,
Doug Romm, MGTS
Texas Instruments
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