Perforated soldering (pins are connected to the PCB board through perforations)
The steps are to first pass the corresponding pins of the components through the PCB board, then use the head of the tin wire to dip some rosin, and then put the soldering iron part close to the pins to be soldered on the PCB board (usually for 1 second), and then Then touch the tin wire stained with rosin to the soldering iron (place it under the tip of the soldering iron or in parallel with the tip of the soldering iron, not on top of the tip of the soldering iron), the tin wire will melt under the high temperature of the tip of the soldering iron and automatically wrap the pins in the shape of water droplets With the PCB board area, quickly remove the tin wire after melting, but at this time, do not remove the tip of the soldering iron, keep the tip of the soldering iron in the original position for about 1 second, let the solder fully melt and flow around the pads and wires, so that it is perfect complete the entire welding process.
Of course, after soldering, if the lead of the soldered component is too long, the excess lead needs to be cut off.
