Hi Virgil,

I have seen people using nitrogen to prevent heavy drossing in production.
That should also give a better wetting characteristics, especially at the
higher reflow environment. The nitrogen is said to pay off just in terms of
solder alloy loss due to drossing. Your big plus is then a gain in quality,
e.g. savings on rework/repair.

best regards,

Thomas Ahrens, Memellandstr. 8, D-24598 Boostedt

-----Ursprüngliche Nachricht-----
Von: Virgil Minor <[log in to unmask]>
An: [log in to unmask] <[log in to unmask]>
Datum: Freitag, 12. Mai 2000 17:41
Betreff: [LF] TSC solder drossing


>How is the heavy/fast drossing characteristic of some lead free solders (
>e.g. SnAgCu) dealt with in process environment of wave soldering.
>
> Doesn't the heavy dross effect the quality of solder tremendously with the
>added surface tension?
>
> What can be done to prevent this?  I know that a trace of phosphurus can
>be added into the solder to have effect on the drossing, but I would like
>to know what other people in Industry know about leadfree in production.
>
>
>Virgil Minor
>Multicore Solders
>
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