Well Ramon, just for you, I went and asked my Dad.
Based on his experience with flux and sweating copper pipes, you have to
rough up the copper pads on your board with 80 grit sandpaper, paint on a
good heavy layer of flux with a brush on both the pad and component, and
make sure you hold the propane torch on the pad and lead a good long time
to make sure it is up to temperature, then apply your wire solder, then
heat some more to make sure it wetted right. Don't clean it and in a
little while the green patina will form on the copper.
Let me know how it works for you.
Doug Pauls
Some days I am just too funny for words......
"Dehoyos, Ramon"
<ramon.dehoyos@NG
C.COM> To
Sent by: TechNet [log in to unmask]
<[log in to unmask]> cc
Subject
10/04/2005 07:19 Re: [TN] Mixing Fluxes: Water Sol
AM and Rosin
Please respond to
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"Dehoyos, Ramon"
<ramon.dehoyos@NG
C.COM>
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]
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Subject
10/03/2005 11:34 [TN] Mixing Fluxes: Water Sol and
AM Rosin
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<[log in to unmask]>
; Please respond
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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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