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October 2005

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Subject:
From:
"Dehoyos, Ramon" <[log in to unmask]>
Reply To:
TechNet E-Mail Forum <[log in to unmask]>, Dehoyos, Ramon
Date:
Tue, 4 Oct 2005 08:19:46 -0400
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        Kid go get your dad, the question was not for you. It was for
Mr. Pauls
        Ramon
 
       hahahahahahaha........
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Douglas O. Pauls
Sent: Monday, October 03, 2005 3:49 PM
To: [log in to unmask]
Subject: Re: [TN] Mixing Fluxes: Water Sol and Rosin

Hoping to hear from Mr Pauls...

Well, Kevin, Mr. Pauls is my Dad, but I am willing to take a shot at it.

Your basic question of whether you CAN mix flux types on a single
assembly can be answered by  Yes you can.  See, I can answer a question
with something besides "It Depends".  I shall now pause whilst some
individuals pick themselves up off the floor.  You have received some
good advance so far.  I like George Wenger's answer about the order in
which you use fluxes.

The key to it all, as with most things in electronics manufacturing is
knowing what you are doing.  If you don't know what you are doing, then
mixing flux Bad Idea Kimosabe.  Understanding the residues and their
effects really dictates what you can and cannot do.  Understanding how
much flux is needed for any particular task is also important.  I have
seen companies use "dangerous" fluxes and produce reliable product and I
have seen companies use "safe" fluxes and produce garbage.  If you have
the data that shows you know what you are doing, and your process is
robust, then you can use almost anything.

Your customer says water solubles, but only rosin fluxes with topical
cleaning after that.  I am not a big fan of this approach either.
Operators have a little flux residue, smear it all over with a topical
cleaner and minimal rinsing and "poof" it is magically clean.  Anyone
who believes this should get their glasses, either prescription or
safety, put a drop of oil on one lense, then smear it around over a
large area.  How clean are the lenses?  Partial cleaning leads to more
failures than no cleaning.  What we do here at Rockwell is to use low
solids fluxes and pastes, clean them with an appropriate aqueous
cleaner, and in selected programs, use a good low residue flux and leave
it in place.  Works great for us.

So, that is a long winded way of saying "It Depends".

Doug Pauls




             Kevin
             <[log in to unmask]
             COM>
To
             Sent by: TechNet          [log in to unmask]
             <[log in to unmask]>
cc

 
Subject
             10/03/2005 11:34          [TN] Mixing Fluxes: Water Sol and
             AM                        Rosin


             Please respond to
              TechNet E-Mail
                   Forum
             <[log in to unmask]>
             ; Please respond
                    to
                   Kevin
             <[log in to unmask]
                   COM>






Is it acceptable to mix flux types on a single piece of hardware?  I
have background in MIL/AERO requirements of the "rosin only" creedo.  My
past experience is with rosin types only, to avoid all the emotional
customer issues and testing requirements.  However, I am now working for
a company and their SOPs dictate use of WS at first solder, followed by
water clean.  They then dictate rosin for any touchup, with hand clean
only.  Is there a risk in mixing water sol and rosin on a single piece
of hardware?
What about resin and rosin?

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