Why use rosin for soldering iron
Rosin can remove oxides on the metal surface and assist the diffusion of tin. Rosin is the most commonly used flux. It is neutral and will not corrode circuit components and soldering iron tips. If rosin is not used, it is difficult to tin the wires. Put the newly bought electric soldering iron into the rosin, and then apply the tin. When the soldering iron is used next time, it will not be unusable due to oxidation of the soldering iron tip.
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