Ingemar,
There was a day that I could just rattle that right off for you ...
... don't use it ... ya loose it!
Will have to see if I can find any notes at home.
It seems that if one component were electroplated [package], the other would be electroless [step lid]
3.8 - 6.4µm was the nickel plating thickness range.
I believe that we would plate the lid whether it was kovar or nickel for roller welding.
My recollection is that the angle was extremely low - like 9° or less.
I will have to dust off many boxes to see if I can find further details :-)
Steve
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Hernefjord Ingemar
Sent: Tuesday, March 13, 2007 10:08 AM
To: [log in to unmask]
Subject: [TN] Seam resistance pulse welding
Hi,
Anyone who's guru at this? Lids=nickel plated 0.5 mm thick Kovar.
Package= goldplated over nickel plated Kovar.
We have He leakage problems due to porous and brittle welds. I suspect
that
a)the 3-4um gold plating on the package is not metallurgically correct,
at least, ought to be much thinner, let's say like flash gold.
b)too thin nickel on the package, just 1 um, should be 5um or more.
c)package shouldn't have electrolytic nickel, but electroless nickel,
because the later has 300 Centigrade lower melting point, and moreover,
is not so brittle (HV300, while EN can be HV1000)
Qs :
what nickel plating do you prefer?
What nickel plate thickness? (Welding, or rather brazing, is
nickel-to-nickel, Kovar should not be involved)
What wheel angle? 9, 12, 15 or what degrees?
Thanks in advance
Inge
---------------------------------------------------
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.asp?Pageid=4.3.16 for additional information, or contact Keach Sasamori at [log in to unmask] or 847-615-7100 ext.2815
-----------------------------------------------------
THE INFORMATION CONTAINED IN THIS E-MAIL MESSAGE AND ANY ATTACHMENTS SENT FROM GENTEX CORPORATION IS GENTEX CONFIDENTIAL INFORMATION INTENDED ONLY FOR THE PERSONAL USE OF THE INDIVIDUAL OR ENTITY NAMED ABOVE. If you are not the intended recipient, you are hereby notified that any review, distribution, or copying of this communication is strictly prohibited. If you have received this communication in error, please immediately notify the sender by return e-mail, and delete this e-mail message and any attachments from your computer.
---------------------------------------------------
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.asp?Pageid=4.3.16 for additional information, or contact Keach Sasamori at [log in to unmask] or 847-615-7100 ext.2815
-----------------------------------------------------
|
