1. Basic principles of welding
The full name of soldering we use should be tin brazing, which uses molten solder to bond two non-melting metal surfaces together. The basic principle is to use the molten solder to wet other metal surfaces under high temperature, so that the parts in contact between the solder and the metal surface form a strong layer of alloy, which is welded together under cooling. For a detailed introduction to brazing, please search for relevant information online.

2. Conditions for good welding

3. Handling of new soldering iron
Generally used internal heating type soldering irons, the soldering iron tip must be tin-plated before use. The purpose of tin plating is to increase the heat conduction speed of the soldering iron. If there is no tin plating, the soldering iron tip will be oxidized as soon as it is heated, and the heat transfer efficiency of the oxide layer will be very low, which will seriously affect the welding effect and even cause the soldering to fail.

1. Prepare a piece of rosin and solder wire.
2. Place the tip of the soldering iron against the rosin and apply electricity to heat it. As the temperature of the soldering iron tip increases, the rosin will melt. At this time, the soldering iron tip must be continuously moved so that the soldering iron tip is wrapped in the rosin liquid and prevents it from contacting the air.
3. When the temperature reaches the solder melting temperature, rub the solder wire back and forth on the soldering iron head so that the entire soldering iron head is evenly covered with solder.
4. Cut off the power and cool down. After the tin plating is completed, it can be used normally.