Tom,

I agree with you.

Phil

-----Original Message-----
From: Tom Parkinson - Quality System Manager - WinTronics, Inc.
[mailto:[log in to unmask]]
Sent: Tuesday, March 11, 2003 11:39 AM
To: [log in to unmask]
Subject: Re: [TN] Mixing fluxes - more


I've read the recent questions and information concerning mixing of
fluxes.  I agree - do not mix flux types when soldering.  However,
here's one for you that can be looked at from a couple of angles....

1. I build a board - wave solder using washable flux.  Flux is
activated, does it's thing, and board is soldered.
2. Water Wash and Dry the board. All washable flux residue is gone.
3. Add a couple of more components that CANNOT be washed (water will
enter the component and ruin it), using NO-CLEAN.
4. Board is done.

Technically, I have used 2 types of fluxes on one assembly....

Another scenario:
1. Board (described above) is finished.  But, fails test - I find a bad
component...
2. I have to use NO CLEAN to replace the component because I cannot
water wash the board (remember the other components that cannot be
subjected to water wash..)
3. Board is done. Passes test - finished.

Again - Technically, I have mixed fluxes on the same assembly.

In the above description, I do not see a problem - or am I missing
something?


Thanks,
Tom

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