Soldering iron pre-welding treatment and welding steps (welding method of electric soldering iron)

(1) Pre-welding treatment steps

(2) Welding steps

After the pre-welding treatment is done, the formal welding can be carried out.

(1) Melt a small amount of solder and rosin on the tip of the soldering iron, and align the tip of the soldering iron and the solder wire at the solder joint at the same time.

(2) Before the flux on the tip of the soldering iron has evaporated, touch the tip of the soldering iron and the solder wire to the solder joint at the same time, and start to melt the solder.

(3) When the solder infiltrates the entire solder joint, remove the soldering iron tip and solder wire at the same time.

The welding process is generally suitable for 2 to 3 seconds. When soldering integrated circuits, the amount of solder and flux should be strictly controlled. In order to avoid damage to the integrated circuit due to poor insulation of the electric soldering iron or the induced voltage of the internal heater to the shell, in practical applications, the method of unplugging the power plug of the electric soldering iron is often used to solder while it is hot.

When welding, it should be ensured that each solder joint is firmly welded and in good contact. The tin joints should be bright, smooth and free of burrs, and the amount of tin should be moderate. The tin and the object to be welded are firmly fused, and there should be no false welding. The so-called false welding means that only a small amount of tin is welded at the solder joint, resulting in poor contact and intermittent connection. In order to avoid false welding, the following points should be paid attention to:

(1) Ensure that the metal surface is clean

(2) Master the temperature

In order to make the temperature appropriate, an electric soldering iron with appropriate power should be selected according to the size of the components, and attention should be paid to the heating time. If you use a low-power electric soldering iron to weld large components or weld the ground wire on the metal base plate, it is easy to form a virtual weld.

(3) Appropriate amount of tin

(4) Select the appropriate flux