Basic instructions for using a soldering iron
The electric soldering iron is the most commonly used tool in electronic welding. Its function is to convert electrical energy into heat energy to heat and weld the solder joints. A large part of its success depends on how well it is controlled. Therefore, from a certain perspective, the electric soldering iron The use of it relies on a sense of technique.
Generally speaking, the greater the power of the electric soldering iron, the greater the heat, and the higher the temperature of the soldering iron tip. Generally, a 20W internal heating soldering iron is sufficient for welding transistors and integrated circuit electronic components. Excessive power can easily burn out the components because the junction temperature of diodes and transistors will burn out if the junction temperature exceeds 200°C. However, in the production of tube amplifiers mainly based on scaffolding welding, the power of the soldering iron should be higher, and you can choose between 35W-45W, or even higher.
It is worth noting that when welding the circuit, the time should not be too long or too short. If the time is too long, it will be easily damaged. If the time is too short, the solder will not be fully melted, resulting in the solder joint being not smooth and firm, and may also produce a false solder. Generally, The most appropriate time must be completed within 1.5s to 4s.
Solder is a fusible metal, and the most commonly used one is solder wire. The function of solder is to connect the component pins to the connection points of the printed circuit board. The choice of solder has a great impact on the quality of welding. Nowadays, the most commonly used solder wire is generally rosin-containing solder wire, but the subdivision is also very particular. Among them, the silver-containing solder wire that does not contain water is of course the top grade.
Also worth mentioning is the solder absorber, which is very practical for novices. It is always easy to get solder everywhere when using a soldering iron for the first time. The solder absorber can help you remove excess solder from the circuit board. In addition, the solder absorber is very effective and useful when dismantling multi-pin integrated circuit devices. It can suck out all the solder joints. However, it is completely unnecessary for people who are skilled in using a soldering iron. A soldering iron can completely replace its function. The component can be easily removed by melting away the solder joints.
Before welding, pre-soldering treatment should be performed on the component pins or the soldering parts of the circuit board.
Remove the oxide layer from the welding part - you can use a broken saw blade to make a knife and scrape off the oxide layer on the surface of the metal lead to reveal the metallic luster of the pin. The printed circuit board can be polished with fine gauze paper and then coated with a layer of rosin alcohol solution.
Component tin plating - tin plating on scraped leads. You can dip the lead in the rosin alcohol solution, press the hot soldering iron tip with tin on the lead, and turn the lead. This allows the leads to be evenly plated with a thin layer of tin. Before welding the wires, the insulation sheath should be stripped off, and then the above two treatments can be done before formal welding. If it is a wire with multiple strands of metal wire, it should be twisted together first after polishing, and then tinned.
