What must be done to a soldering iron tip to maximize heat transfer?

To maximize heat transfer from a soldering iron tip, it is crucial that the tip is free of contaminants and properly tinned. When a soldering iron tip is clean and correctly tinned, it ensures optimal contact with both the solder and the surfaces being joined.

A clean tip facilitates better thermal conduction, allowing heat to be transferred more efficiently. Contaminants such as oxidation or dirt can create barriers that impede heat transfer, resulting in poor solder joints. Proper tinning involves applying a small layer of solder to the tip which not only protects it from oxidation but also enhances its ability to transfer heat, ensuring that solder flows smoothly when it makes contact with the components.

This approach is a standard practice in soldering as it not only aids in effective heat transfer but also prolongs the life of the soldering iron.