Steven.

Where I used to work before, there is free standing vacuum soldering
machine. I don't know how good these machines are. Ours had constant
problems, so we do not use it much. Instead we use the in-line
machine, which one has never made us disappointed.

You can buy a cheap vacuum assisted VP for small a money:

http://compare.ebay.com/like/230498299777?ltyp=AllFixedPriceItemTypes&var=sbar&rvr_id=211505894475&crlp=1_263602_304662&UA=WXI8&GUID=0f0ff6be12e0a04374052305fff2978a&itemid=230498299777&ff4=263602_304662


Inge



On 18 February 2011 12:35, Steven Creswick <[log in to unmask]>

> Cedric
>
> wrote:I echo Inge's comments with respect to 'drying' the elements and
> George,
> Richard and Paul's on the possibilities of volatiles and suggested use of
> pre-tinning and minimal flux.  Definitely Denny's on wetting to the Ni.
>
> Since you are seeing lot to lot differences - the first thing I would
> attempt is to pre-tin!  Answer your Ni wetting question once and for all.
> By pre-tinning, you should be able to force it to wett!  ... then clean it.
>
> The channels which Paul mentions DO work, and don't have to be extremely
> macroscopic... but you likely can not do that with these parts.
>
> Somewhat surprised that no one commented on Thorsten's suggestion for
> (vacuum) vapor phase reflow.
> I my days of making power devices I had the luxury of a vacuum
> reflow/brazing system using conduction heating via graphite tooling.  You
> would be surprised at how much 'gas & crap' [technical terms] you can pull
> out of a plated metal under vacuum - to Inge's comment.  Having pre-wetted
> components and no flux [could purge with a forming gas] and ability to
> over-pressurize would result in essentially void free joints.
>
> I can see that the vapor phase approach could drastically lessen/eliminate
> the need for a flux - assuming the surfaces are clean.  I realize you don't
> have one, but maybe for this project, you could go to someone that does -
> depending upon whether this was a one shot deal, or will be a recurring
> project/nightmare.
>
> What I am not familiar with however, is .... is there such a thing as a
> vacuum vapor phase??
> How does that work, or was that just a 'typo'?
> I would like to learn more about that particular piece of equipment if
> there
> is such a critter.
>
> Sincerely,
> Steve Creswick
> http://www.linkedin.com/in/stevencreswick
>

>
>
>
>
>
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