Hi Chris,
This might be a tangent to your original questions, but why/how did you select SAC 305 for wave?. During our qualification runs with SAC 305, we had extensive degree of microcracking on bottom side fillets for TH joints on a couple of different occasions. We have not had that defect show up in high Sn alloy (without naming names, the most common high Sn alloy) we used instead.
Food for thought?
Amol Kane
M.S (Industrial Eng.)
Process Engineer
Harvard Custom Manufacturing, Inc.
941 Route 38 Owego, NY 13827
Phone: (607) 687-7669 x349
[log in to unmask]
www.harvardgrp.com
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Chris Schaefer
Sent: Friday, July 21, 2006 10:39 AM
To: [log in to unmask]
Subject: [TN] SAC 305 Pb Free Wave Solder Profile Help
Hello everyone,
Its Friday yeeeeehawww! Kansas talk over here...
I am setting my first Pb Free wave soldering line and I have some questions
concerning acheiving an Optimum profile. I am using SAC305 at 509F (265C);
I am using 2 IR heaters (for now until more demand for Pb products come
around); I am using a foam fluxer with Kester 186-18RMA; Speedline
Ultrafill nozzles (chip and laminar); all packaged in an old cerca 94 EPK
Plus. I am currently in the certification stage where I am about to run the
qualification vehicles that will be sent out for testing. Of course I need
to make sure that all is well prior to soldering them, so I would like to
get some feedback from the land of eternal knowledge. I have been shooting
for a topside board temperature of 248F (120C) prior to hitting the wave
and I have achieved this, but the results are not very good. The test
vehicle are single sided with SMT and PTH components, and I thought I would
achieve good solder formation on the leaded components. My question is what
would be the maximum topside temperature I could use with degrading the
substrate and solder joints. I have run the test boards at higher topside
temps. (287F) and get good results, but I'm concerned that it may be too
high. The flux is holding up very well duing the process, so this is not a
problem and I believe that 509F solder bath temp. is a good start. Also,
what should be the maximum board temp. delta during the solder wave? If any
of you have anything to offer I would very much appreciate it.
Thanks Guys and Gals
Have a great weekend...
Chris Schaefer
Suntron Corporation
Process Engineer
540 N. Rogers Road
Olathe, Kansas 66062
913.393.5878
[log in to unmask]
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