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March 2006

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Subject:
From:
"Kane, Amol (349)" <[log in to unmask]>
Reply To:
TechNet E-Mail Forum <[log in to unmask]>, Kane, Amol (349)
Date:
Fri, 3 Mar 2006 07:14:38 -0500
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What solder did you use for the wave?? We did our first lead-free run not too long ago.

Amol Kane
M.S (Industrial Eng.)
Process Engineer
Harvard Custom Manufacturing 
941 Route 38  Owego, NY 13827
Phone: (607) 687-7669 x349
[log in to unmask]

 -----Original Message-----
From:   TechNet [mailto:[log in to unmask]]  On Behalf Of Stephen Gregory
Sent:   Thursday, March 02, 2006 5:15 PM
To:     [log in to unmask]
Subject:        [TN] As long as we're talking about silver...

Hi All!

 

I figured as long as we're talking about silver, you might take a look
at some PTH solder joints on some boards we just built with an immersion
silver finish. I'm posting these pictures because this is the first
production board we've built here that has an ImAg finish, and I would
like to know if this appearance is pretty typical. Go check out:

 

http://stevezeva.homestead.com/files/Immersion_Silver_PTH.jpg

 

http://stevezeva.homestead.com/files/Immersion_Silver_PTH_2.jpg

 

This particular board went through double-sided reflow, and then the PTH
was soldered using a selective wave solder pallet while being fluxed
with an ultrasonic spray fluxer using Kester 2331ZX OA flux.

 

You can see that the solder didn't flow out to the edges of the pads on
the primary side of the board, the secondary side of the board looks
wonderful.  I know this is not a defect according to the -610...but is
this typical? Especially since it went through two reflow cycles?

 

Thanks in advance!

 

-Steve Gregory-

 

 



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