Volkmar
Manufacturers of fluxes produce and sell a wide range of fluxes which
are sold as "no-clean". Some contain rosin, others don't. Some contain
halogenated activators, others don't. Some are very active and are
consequently easy to solder with, but leave more dangerous residues,
others don't, but are the devil to solder with. Some you can clean,
others you cannot.
To answer your questions: you have to select a shortlist of, say, 5
fluxes which meet your criteria, on paper. You then do extensive trials,
with various parameters (Taguchi is very useful for this, as you can cut
the number of experiments drastically). After having optimised the
process for each flux, you have to produce some test boards that you
need to qualify as meeting your requirements for reliability under the
conditions the boards will be used in (electrochemical migration etc.)
and for setting up your process for quality control. As a result of
this, you can select your #1 candidate and #2 to fall back on if there
is an interruption of supply. No one here can do your homework for you,
I'm afraid.
Brian
Volkmar Huss wrote:
>
> Hi TechNetters,
>
> we are working on defining our "No Clean" soldering process. The
> solder-paste and flux manufacturers certify the "No Clean" capability of
>
> their products to some extend, but what is the definition of "No Clean"?
>
> And I don't mean the statement, that only inert residues of flux and
> solder-paste additives remain on the board.
> Are there any standards that can used as a reference?
> How do you measure the:
> "No Clean" capability of solder paste, flux and tubular solder with flux
>
> core?
> "No Clean" quality of printed board assemblies?
> "No Clean" quality of printed board assemblies onto which devices have
> been hand-soldered?
> and all of this for prototype and series production?
>
> I have gleaned some insights from the TechNet archives, but any
> additional input is very welcome.
>
> Best regards
>
> Volkmar Hu
>
> Engineering Electronic Circuit Boards
> Aufbau- und Verbindungstechnik
> _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
>
> DRGER ELECTRONICS
>
> Draeger Electronics GmbH
> Moislinger Allee 53-55
> D-23558 Lbeck
>
> Tel: +49-451-882-3998
> Fax: +49-451-882-4365
> mailto:[log in to unmask]
> Website http://www.draeger.com/de/EL
> _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
>
> --
> Best regards / Mit freundlichen Gren
>
> Volkmar Hu
>
> Engineering Electronic Circuit Boards
> Aufbau- und Verbindungstechnik
> _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
>
> DRGER ELECTRONICS
>
> Draeger Electronics GmbH
> Moislinger Allee 53-55
> D-23558 Lbeck
>
> Tel: +49-451-882-3998
> Fax: +49-451-882-4365
> mailto:[log in to unmask]
> Website http://www.draeger.com/de/EL
> _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
>
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