Stephen,
Interesting dilemma. In addition to the pad damage defect IPC also indicates
a minimum solder joint of 270 deg wetting (7.5.5.4). I don't understand why
having part of the pad missing yet still meeting the above criteria would
lead to reliability issues.

I would be trying to convince my customer that the solder joint is reliable
as made and any rework would generally decrease the reliability.

In addition, I think that IPC should be looking at this particular
occurrence and maybe consider some changes to the current criteria. I think
you have a reliable joint as it stands.

Joel

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Stephen Gregory
Sent: Wednesday, January 25, 2006 12:09 PM
To: [log in to unmask]
Subject: [TN] Pad Damage, Leave it alone, or fix it?

Afternoon All,

Today we had one of our final inspectors spot something on a board that was
getting ready to ship, that I'd like for you all to look at and offer an
opinion if you would...BTW, the board has been tested and coated (with
urethane).

Anyways, our inspector spotted a pad on the backside of a connector lead
that looks like it has a piece of it missing. Take a look at:

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

and:

http://stevezeva.homestead.com/files/Pad_Damage_2.jpg

Not really sure if the board was like that from the beginning, or if it
happened possibly during the lead clipping step just before wave solder.
Bottom-line is that we've spotted it. Of course our customer is going to
have the final say on what we are to do about it, but I'd like your opinion
on the problem.

The -610 says at 10.2.9.3 that damage to a conductor/land is a defect, cut
and dried. But then there is the practical side...

Does this look bad enough that you would go through all the hassle of having
to strip the coating, remove the connector, and repair the pad? Do you think
that the performance is compromised with this issue?

Just curious what you all think... 

Stephen Gregory
Senior Process Engineer
LaBarge Incorporated      
Tulsa, OK 74146
(918) 459-2285
(918) 459-2350 FAX
  

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