Steve,
would you mind to post them on Steve Gregory's webpage? (Steven..would you?)
i would also like to have a lok at them.
thanks in advance, Ivan
>Steve,
>That would be useful. Yes, please send.
>Bev
>
>-----Original Message-----
>From: Steve Kelly [mailto:[log in to unmask]]
>Sent: Monday, July 16, 2007 12:17 PM
>To: 'TechNet E-Mail Forum'; Bev Christian
>Subject: RE: [TN] Question about rework of paste in hole solder joints
>
>Hi Bev, I can send you some pictures of some parts without what I would call IPC
>standard hole fill that are used in a very rugged military environment
>and
>the customer has had no issues. They put these through heavy vibration,
>thermal etc. with no issues but in all cases they had at least some
>fill.
>Regards Steve Kelly
>
>-----Original Message-----
>From: TechNet [mailto:[log in to unmask]] On Behalf Of Bev Christian
>Sent: July-16-07 11:44 AM
>To: [log in to unmask]
>Subject: [TN] Question about rework of paste in hole solder joints
>
>Technetters, Good morning! We generally do not use PTH parts. As a result, we
>do
>not do wave soldering, but use paste-in-hole or pin-in-paste, chose your
>moniker. Because we buy the part in question from two different
>suppliers, who make the parts with different dimensions, we have had to
>use fairly large, oval holes instead of a more conventional round hole.
>And the part leads do not stick out the bottom of the hole either. With
>overprinting we have been able to get what is deemed adequate solder
>joint strength (and reliability (Yes, I know the difference, Werner.)),
>even though the hole fill is not stellar. Wetting angles are good and
>proper intermetallics are formed.
>
>Now let's say we do a rework - removing the component, dressing the hole,
>inserting a new part and resoldering using hand soldering with
>cored wire. The internal debate is whether we should demand hole fill
>to meet normal IPC standards or whether we allow the same amount of hole
>fill that is allowed for the original paste-in-hole. Opinions and/or
>experiences (if you are willing to share the latter :) ) appreciated.
>Thanks in advance.
>
>Bev
>RIM
>
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