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The Fluxing Process
The function of flux is to enhance wetting of
the base metal by the solder by removing films from the
pre-cleaned surface. The flux also prevents oxidation
during the soldering process. It cleans the metal and
lowers the surface tension between the molten metal
and the base metal.
Flux is activated when heated, beginning the cleaning
and protective processes. It is good practice to use
the mildest flux that will do the job. The selection
of a flux depends primarily on the solderability of
the metal to be soldered, but other factors which
influence the selection of flux include:
- the type of assembly being soldered,
- accessibility of soldered joint for flux residue removal after soldering,
- the method of heat application.
Fluxes are classified into two groups:
Acid fluxes (corrosive fluxes, zinc chloride is the
most common) cut through oxides, etc., with their strong
chemical action, making them useful for:
- general purpose soldering,
- automotive applications,
- plumbing applications,
- sheet metal applications.
Rosin fluxes (non-corrosive fluxes) leave non-
corrosive/non-conductive residues, making them ideal for:
- electronic/electrical work,
- copper and copper wire,
- precoated metals with a solderable finish.
These classifications refer to the residue which remains
after the fluxing action is completed.
Hint:
It is a good practice to use the mildest flux that will do
the job. Refer to the Flux Selection tables on page 18 for
the appropriate Aladdin flux to do your soldering job.
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