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February 2003

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Subject:
Re: Adding liquid flux when hand soldering
From:
Brian Ellis <[log in to unmask]>
Reply To:
TechNet E-Mail Forum.
Date:
Thu, 27 Feb 2003 10:16:37 +0200
Content-Type:
text/plain
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text/plain (47 lines) 
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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