Editing How to solder electrical connections (section)
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===Solder=== A supply of 63/37 (tin/lead) or 60/40 solder. 63/37 is a eutectic mixture having a low melting point (183° C or 361.4° F). Solder diameter varies, 24 gauge (0.0201") is sometimes used for harness making, and it works well for circuit board assembly also, a good mid-sized gauge. Generally staying at or below about 1/16" diameter is fine for automotive electrical work. Rosin core solder is OK but doesn't mean added flux won't be needed. In recent years, lead solder has been replaced by "lead free" solder. This is made from a combination of different elements such as Sn, Ag, and Cu (tin, silver, and copper). Generally the lead free solders have a higher melting point than tin/lead solder. Lead free solder uses a flux made for it, as well.
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