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October 2009

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Subject:
From:
"Iven, Jowan" <[log in to unmask]>
Reply To:
TechNet E-Mail Forum <[log in to unmask]>, Iven, Jowan
Date:
Wed, 28 Oct 2009 14:06:17 +0100
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Hi Leland,

What about the location of the solderball?
Doesn't that give you enough information?

Where on the board was the solderball located?
Or did the problem occur somewere else but the board?


Jowan


-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Leland Woodall
Sent: Wednesday, October 28, 2009 12:54 PM
To: [log in to unmask]
Subject: Birth of a Solderball

TechNetters,

Is there any possible way to determine the origin of a solder ball?
We've had a failure because of one, and we're trying to determine
whether it came from our SMT or wave soldering process.

We use SAC305 at both, so using the SEM to determine alloy composition
is not really helping.

The ball itself is spherical with no "tails" and quite shiny in
appearance.

If we cross section the ball, will we see a difference in grain
structure due to the differences in cool down rates?  Is there anything
else we can use or do?

Thanks in advance for your help!

Leland

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