Eric,
You are just kidding, right?
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Eric CHRISTISON
Sent: Wednesday, September 24, 2008 10:35 AM
To: [log in to unmask]
Subject: Re: [TN] Soldering SMA to heavy RF packages, need advice
Inge,
Don't the people who designed this thing have some idea how it should be
soldered?
Regards,
Thayer, Wayne wrote:
> Hi Inge!
>
> Nickel is pretty lossy, so you could possibly heat with electrical
> energy. Still lots of current required--probably on the order of
> 100A/mm of nickel. Nickel doesn't conduct heat real well either, so
> you would want to drive the current pretty close to where the solder
> needs to be melted. I'll bet a few days of playing with an arc
> welding power supply would get you a process. Or you could just use a
> car battery and some jumper cables and see what happens!
>
> Problem I see with this technique might be package warpage due to
> differential coeff of expansion and the local heat, similar to
> problems of using a torch, but the electrical would have much better
control.
>
> Wayne Thayer
>
> -----Original Message-----
> From: TechNet [mailto:[log in to unmask]] On Behalf Of Hernefjord Ingemar
> Sent: Wednesday, September 24, 2008 10:46 AM
> To: [log in to unmask]
> Subject: Re: [TN] Soldering SMA to heavy RF packages, need advice
>
> Mike,
>
> THAT was new to me! Good start, I'd say, many thanks. Hope our machine
> can manage 260 C.
>
> Inge
>
> -----Original Message-----
> From: TechNet [mailto:[log in to unmask]] On Behalf Of Mike Sewell
> Sent: den 24 september 2008 16:33
> To: [log in to unmask]
> Subject: Re: [TN] Soldering SMA to heavy RF packages, need advice
>
> Inge,
>
> Galden makes fluids that go to 260C...
>
> http://www.solvaysolexis.com/static/wma/pdf/9/7/7/0/Galden%20VPS.pdf
>
> Mike
>
> -----Original Message-----
> From: TechNet [mailto:[log in to unmask]] On Behalf Of Hernefjord Ingemar
> Sent: Wednesday, September 24, 2008 9:26 AM
> To: [log in to unmask]
> Subject: [TN] Soldering SMA to heavy RF packages, need advice
>
> TNetters godday.
>
> Target is very large metal packages with bright nickel finish. Imagine
> soldering hermetic feedtrues. Nickel needs higher temperature and
> longer exposure time than copper, silver, gold and other metals.
> Vapour phase soldering is maximum 218 Centigrades, which I believe is
> not high enough. Iron soldering is not practical for launches. IR oven
> could be an idea if we add protection gas. Hot gas stations
> (Nitrogen)seem to be too lame. Resistance soldering not tested,
> unknown for SMA. Torch heard of, ought to be impractical, will burn
> flux and miscolor package. Laser soldering not practised.
>
> Anyone out there with experience from this kind of soldering?
>
> Inge
>
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--
Eric Christison Msc
Mechanical Engineer
Consumer & Micro group
Imaging Division
STMicroelectronics (R&D) Ltd
33 Pinkhill
Edinburgh EH12 7BF
United Kingdom
Tel: +44 (0)131 336 6165
Fax: + 44 (0)131 336 6001
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