Are you kidding, Eric! Design engineers with production knowledge! I have a
dream......that your vision could be reality!
Enough said about that, am afraid many will nod.
Inge
----- Original Message -----
From: "Eric CHRISTISON" <[log in to unmask]>
To: <[log in to unmask]>
Sent: Wednesday, September 24, 2008 8:35 AM
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
>
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