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 > >--------------------------------------------------------------------- This >transmission (including any attachments) may contain confidential >information, privileged material (including material protected by the >solicitor-client or other applicable privileges), or constitute >non-public >information. Any use of this information by anyone other than the >intended >recipient is prohibited. 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