How to solder a printed circuit When soldering, start by heating the soldering iron to 300–350°C and always handle it by the insulated grip to avoid burns. For new soldering irons, perform "tinning" by applying solder to the tip before use. When soldering wires, strip and twist them together, heat with the iron, and then apply solder until fused. Finally, clean the iron tip using a cleaning pad or damp sponge to maintain its condition.
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