Hi Steve,

What kind of pre-heaters do you have in your machine? Convection or
radiant IR? Do you have top and bottom pre-heaters or bottom only?

I have pre-heated assemblies in an oven before and then quickly carried
them over to the machine so I didn't have to slow the conveyor speed to
a crawl  and cause the board to spend too much time on the wave. 

But what I have also done before with heavy copper, large thermal mass
boards is to run them through the machine with the wave off to pre-heat
them, then quickly run them through again with the wave turned on. I
would also turn the chip wave on to give the board another bump of heat
before it hit the laminar wave. Topside fluxing also helps with barrel
fill on thick, heavy boards.

Here's an example of the kind of heavy copper I'm talking about:

http://stevezeva.homestead.com/HeavyMetal.jpg

http://stevezeva.homestead.com/HeavyMetal2.jpg

http://stevezeva.homestead.com/HeavyMetal3.jpg

Steve 

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Vargas, Stephen M
Sent: Friday, June 13, 2014 8:03 AM
To: [log in to unmask]
Subject: [TN] Metalized Film Capacitors

Good Morning All:

     We have a unique application here where we need to solder a series
of EPCOS Metalized Film Capacitors
(http://pdf1.alldatasheet.com/datasheet-pdf/view/470157/EPCOS/B32778G950
6K000.html) to staggered strips of 1/16" solid copper. Some assemblies
will consist of as many as 24 capacitors with a net panel size as large
as 8" x 14". My concern is trying to determine how I can mass solder
these assemblies. I'm concerned that I won't be able to adequate
pre-heat the assembly at our wave solder machine to insure we get
compliant solder fillets. I'm thinking we can preheat the assemblies
before we place it into the machine, but with projected medium to high
volume, I'm not sure if this is the best alternative. Looking for some
advice. Thanks in advance.

Regards,
Steve Vargas


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