How to use a soldering iron correctly? How to use a soldering iron correctly
Key points to note when soldering with an electric iron:
1. Before using an electric soldering iron, check if the iron is properly grounded.
2. Before welding, pay attention to whether the power of the soldering iron matches the solder joint.
3. Clean the soldering iron tip with a sponge and then tin it.
4. Clean and tin the components to be soldered, and then solder them back on. The temperature should not be too high and the soldering time should not be too long.
5. Attention should be paid to the permeability of solder joints, the spacing between dots, and the compatibility between rosin and solder paste.
6. After welding, it is necessary to check whether the welded parts have virtual welding, incomplete welding, wrong welding, short circuit and other phenomena.
Welding gestures
1. The method of holding an electric soldering iron
(1) Gripping technique. Suitable for lightweight soldering irons, such as 30W internal heating soldering irons. Its soldering iron tip is straight, and the tip will be filed into a sloping or conical shape, suitable for soldering small solder pads.
(2) Gripping technique. Suitable for high-power soldering irons.
2. Several methods for soldering leads on printed circuit boards.
(1) Directly cut the head. The lead wire is directly passed through the through-hole, and during soldering, an appropriate amount of melted solder is evenly wrapped around the soldered lead wire above the solder pad, and the excess lead wire is cut off.
(2) Directly bury your head. The lead passing through the through-hole only exposes an appropriate length, and the melted solder buries the lead head inside the solder joint.
Prevent welding defects
1. Suitable soldering materials should be selected, such as low melting spot welding tin wires used for soldering electronic components.
2. Flux, using 25% rosin dissolved in 75% alcohol (by weight) as the flux.
3. Welding method: Clean the solder pads and pins of the components with fine sandpaper and apply soldering flux.
4. The welding time must not be too long, otherwise it is easy to burn out the components.
5. The integrated circuit should be soldered last, and the soldering iron should be reliably grounded or soldered using residual heat after power failure.
