Phil,
It depends on how you define "better solder joints". If you only have visual requirements of the solder joint it will likely be a better solder joint if you add extra flux. If you also have requirements regarding surface insulation resistance between solder joints, then it is quite a different situation and you need to measure the SIR before you can tell whether it is a better solder joint or not. Very likely, it is not.
Per-Erik Tegehall
-----Ursprungligt meddelande-----
Från: Phil Nutting [mailto:[log in to unmask]]
Skickat: den 27 februari 2003 14:43
Till: [log in to unmask]
Ämne: Re: [TN] Adding liquid flux when hand soldering
Brian,
I can't argue with your statements. I can only speak from personal experience (including a test last night) that adding the liquid flux makes a much better solder joint with less heat applied to the joint. In a quick poll of some of my fellow old-timers who worked on military stuff all agreed.
Gee, what would Moonman say to this one?
Phil
-----Original Message-----
From: Brian Ellis [mailto:[log in to unmask]]
Sent: Thursday, February 27, 2003 3:17 AM
To: TechNet E-Mail Forum.; Phil Nutting
Subject: Re: [TN] Adding liquid flux when hand soldering
If you are using cored solder, you should never add flux. Because:
a) liquid flux will spread beyond where you need it and add to contamination
b) the chances are the two fluxes will be incompatible with each other
c) there is a distinct possibility the residues will be impossible to
clean off correctly or, if they are both "no-clean", they will form a
dangerous flux porridge which could be ionically incompatible with
reliability
d) you are insulting the wire manufacturer who has determined the
quantity and type of flux, through scientific lab tests, to optimise
what you are trying to do.
IOW, you will cause far more harm than good.
Brian
Phil Nutting wrote:
> Is it a common practice to add liquid flux when soldering by hand or do you rely on the flux core of the solder? My 30+ years says add the liquid flux for the best solder joint, but that was back when I was involved with rocket science.
>
> Phil Nutting
>
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