Soft soldering
The most commonly used solders for soft soldering are alloys of tin and lead, although a
wide range of other alloys are used to a lesser extent, often for special purposes.
Table 13.1 lists the compositions of normal types of solder.
Solder is often supplied in the form of wire or bars, generally with flux cores.
Fluxes are often weak acids or salts. As they are corrosive, their residues must be
removed from the joint after soldering. An alternative, which does not normally result in
corrosion if traces are left, is the use of resins dissolved in an organic solvent. There are
also liquid and paste fluxes.
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