Cedric,
I've seen the same condition occur in our process when we had a fluxer
to partially clog or completely fail.
Leland
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Paul Edwards
Sent: Monday, January 17, 2011 4:48 PM
To: [log in to unmask]
Subject: Re: [TN] Board failure due to fibber like fragments of alloy
after wave soldering
Cedric,
How were the "fibers" in the solder joint able to short the SMT pads?
Did the "fiber" grow to be a short or just strung from one joint to the
other?
If I saw that on a PCA I would assume that there was insufficient flux
on the PCA or the flux was "baked" on the PCA before it hit the wave....
Paul
Paul Edwards
Process/Quality Engineering
Surface Art Engineering
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Steve Gregory
Sent: Monday, January 17, 2011 12:56 PM
To: [log in to unmask]
Subject: Re: [TN] Board failure due to fibber like fragments of alloy
after wave soldering
Hi Cedric,
What does your last solder analysis say? You do get your pot analyzed
don't
you?
Steve
****
From: TechNet [mailto:[log in to unmask]] On Behalf Of Cedric ORAIN
Sent: Monday, January 17, 2011 2:57 PM
To: [log in to unmask]
Subject: [TN] Board failure due to fibber like fragments of alloy after
wave
soldering
After wave soldering of boards with both SMD and PTH components, 18% of
the
boards failed during ICT.
The failure is due to shorts between SMD pads.
These shorts are caused by "fibber like" fragments entrapped in solder
joints. We are looking for root cause of this level of waste.
These fragments are very similar in aspect with dross that we found on
the
top of the wave "head" after the pump stop. You can see dross picture in
the
pictures posted here:
http://ipc-technet.groupsite.com/gallery/17663
The alloy is Sn63Pb37 and the flux is an alcohol based no-clean flux.
Soldering under air atmosphere. The design of the board is ok. Dross is
removed daily.
Did you ever encountered this kind of issue (I mean with such a rate of
defect)?
I'm wondering if the aspect of the dross shown in the picture is normal
or
is it due to a pollution (metallic pollution: high Cu rate?? / organic
pollution : epoxy, fiber glass fragments ...).
Thanks for your in advance for your help and support,
Best regards,
Cedric ORAIN
______________________________________________________________________
This email has been scanned by the MessageLabs Email Security System.
For more information please contact helpdesk at x2960 or
[log in to unmask]
______________________________________________________________________
---------------------------------------------------
Technet Mail List provided as a service by IPC using LISTSERV 15.0
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.aspx?Pageid=E-mail-Forums for additional
information, or contact Keach Sasamori at [log in to unmask] or 847-615-7100
ext.2815
-----------------------------------------------------
========================================================================
======
This email and any attachments thereto may contain private,
confidential, and
privileged material for the sole use of the intended recipient. Any
review, copying,
or distribution of this email (or any attachments thereto) by others is
strictly prohibited.
If you are not the intended recipient, please contact
[log in to unmask]
immediately and permanently delete the original and any copies of this
email and
any attachments thereto.
========================================================================
======
______________________________________________________________________
This email has been scanned by the MessageLabs Email Security System.
For more information please contact helpdesk at x2960 or
[log in to unmask]
______________________________________________________________________
---------------------------------------------------
Technet Mail List provided as a service by IPC using LISTSERV 15.0
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.aspx?Pageid=E-mail-Forums for additional
information, or contact Keach Sasamori at [log in to unmask] or 847-615-7100
ext.2815
-----------------------------------------------------
______________________________________________________________________
This email has been scanned by the MessageLabs Email Security System.
For more information please contact helpdesk at x2960 or [log in to unmask]
______________________________________________________________________
---------------------------------------------------
Technet Mail List provided as a service by IPC using LISTSERV 15.0
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.aspx?Pageid=E-mail-Forums for additional information, or contact Keach Sasamori at [log in to unmask] or 847-615-7100 ext.2815
-----------------------------------------------------
|
