Basic usage methods of common electric soldering irons
Electric soldering iron is the most commonly used tool in electronic welding, which converts electrical energy into thermal energy to heat and weld the welding points. The success of electric soldering iron largely depends on how it is controlled. Therefore, from a certain perspective, the use of electric soldering iron relies on a sense of technique.
Generally speaking, the higher the power and heat of an electric soldering iron, the higher the temperature of the soldering iron tip. A 20W internal heating soldering iron is sufficient for the welding of general transistors and integrated circuit electronic components. Excessive power can easily burn out components, as diodes and transistors can burn out when the junction temperature exceeds 200 ℃. But in the production of biliary machines mainly based on ceiling welding, the power of the electric soldering iron is higher, and can be selected from 35W-45W, or even larger.
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 is easy to be damaged. However, if the time is too short, the solder cannot be fully melted, resulting in uneven and unstable solder joints, and may even cause virtual soldering. Generally, the most appropriate time must be completed within 1.5s to 4s.
Solder is a fusible metal, and the most commonly used is usually solder wire. The function of soldering is to connect the component pins to the connection points of the printed circuit board, and the choice of soldering has a significant impact on the soldering quality. The most commonly used wire nowadays is generally rosin containing solder wire, but it is also quite particular when subdivided. Among them, the silver containing solder wire that is truly free of moisture is of course of high quality.
Another thing worth mentioning is the solder absorber, which is very practical for beginners. When using an electric soldering iron for the first time, it is always easy to get solder everywhere. The solder absorber can help you dispose of excess solder on the circuit board. In addition, the solder absorber is very effective and useful in removing multi pin integrated circuit devices. It can suck out all the solder joints, which is completely unnecessary for those who are proficient in using soldering iron. Using soldering iron can completely replace its function. By melting off the solder joints, the components can be easily removed.
Before welding, the soldering area of component pins or circuit boards should be treated before welding. Remove the oxide layer from the welding area - a small knife can be made using a saw blade to scrape off the oxide layer on the surface of the metal lead, exposing the metallic luster of the pin. Printed circuit boards can be polished with fine gauze paper and coated with a layer of rosin alcohol solution. Tin plating of components - Tin plating on scraped leads. After dipping the lead in rosin alcohol solution, press the hot soldering iron tip with tin onto the lead and rotate it. This can evenly coat the leads with a thin layer of tin. Before welding the wire, the insulation skin should be peeled off and then subjected to the above two treatments before it can be officially welded. If the wire is made of multiple strands of metal wire, it should be twisted together before tin plating after polishing.
