Ingemar,
Wow! Man, I have long since forgotten about this thread.
I believe the intent was to primarly melt the platings without involving too much of the base metal. However, I doubt that one could totally exclude the base metal from the weld.
I believe that I struck out on my search. Will re-evaluate where I left off. The history that I could go to at CTS, no longer exists - sadly.
Steve
-----Original Message-----
From: Hernefjord Ingemar [mailto:[log in to unmask]]
Sent: Monday, August 11, 2008 7:12 AM
To: TechNet E-Mail Forum; Creswick, Steven
Subject: RE: [TN] Seam resistance pulse welding
Trikeman, again,
Q still actual, welding problems up and then.
how's the dust removal succeding? You said 'no Kovar involved' ..how do you avoid Kovar?
Hovering above the greens these days?
Inge
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Creswick, Steven
Sent: den 13 mars 2007 17:38
To: [log in to unmask]
Subject: Re: [TN] Seam resistance pulse welding
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
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