Hi All!
Wouldn't you know it, all these postings about ENIG and all of a sudden
an issue just started happening with some ENIG boards we're building.
The problem is sporadic. We're building a double-sided SMT board using a
SAC 305 paste, and I haven't seen any non-wetting problems with the SMT
yet.
We're selective wave soldering using SN96 and a RMA flux, and after
about 250-300 boards my touch-up operators flagged me down and said that
they're seeing some boards that have through-hole pads that aren't
wetting no matter what they do. Here's some pictures:
http://stevezeva.homestead.com/files/Non_Wetting_Pads.jpghttp://stevezeva.homestead.com/files/Non_Wetting_Pads_2.jpghttp://stevezeva.homestead.com/files/Non_Wetting_Pads_Close.jpg
The pads look like bare copper...no nickle. Is this related to the
latest thread? Like I said I haven't seen any SMT with this issue (yet),
and it just started showing up...we've built a few hundred boards with
no problems until now.
I'm having the operators set the boards aside with the problem. Am I
pretty much hosed with these boards?
-Steve Gregory-
---------------------------------------------------
Technet Mail List provided as a service by IPC using LISTSERV 1.8e
To unsubscribe, send a message to [log in to unmask] with following text in
the BODY (NOT the subject field): SIGNOFF Technet
To temporarily halt or (re-start) delivery of Technet send e-mail to [log in to unmask]: SET Technet NOMAIL or (MAIL)
To receive ONE mailing per day of all the posts: send e-mail to [log in to unmask]: SET Technet Digest
Search the archives of previous posts at: http://listserv.ipc.org/archives
Please visit IPC web site http://www.ipc.org/contentpage.asp?Pageid=4.3.16 for additional information, or contact Keach Sasamori at [log in to unmask] or 847-615-7100 ext.2815
-----------------------------------------------------