How to choose the power size of electric soldering iron
What is the power of a general factory electric soldering iron?
1. General soldering iron: 25w
2. A slightly larger and faster electric soldering iron: 50w
3. Higher power: 75W, 100W, 150W, 300W
4. The high-power ones are generally of the external heating type, while the low-power ones are generally of the internal heating type.
The soldering iron power of the lead-free soldering station is generally 60 ~ 90W, which is not very high power. The soldering iron used in the electronics factory does not need such a high power. The soldering iron generally consists of a heater, a welding handle, and a high-frequency power supply. There are also times when the soldering iron is not in use. It is necessary to add tin to the tip of the soldering iron for maintenance. Adding tin is to prevent oxidation of the tip of the soldering iron. Turn off the soldering iron if it is not used for 10 minutes. The composition of the tin wire (lead-free tin wire) is tin, silver and copper, and the middle of the tin wire is hollow.
Power selection of external heating electric soldering iron and internal heating electric soldering iron
The external heating type refers to a kind of electric soldering iron with the soldering iron head inside the heating core, also called ordinary electric soldering iron. Generally, there are 30W, 40W, 60W and so on. Soldering ordinary products, there is no requirement for temperature, use an external heating type electric soldering iron.
Internal heating electric soldering iron, the heating core is made of ceramic core. The heating core is inserted into the tip of the soldering iron. There are single handles and soldering stations. It heats up faster than an externally heated soldering iron.
There are many types and specifications of electric soldering irons, and the sizes of the workpieces to be welded are different. Therefore, the rational selection of the power and type of electric soldering irons has a direct relationship with improving welding quality and efficiency.
When choosing a soldering iron, you can consider the following aspects:
1) When soldering integrated circuits, transistors and vulnerable components due to heat, 20W internal heating or 25W external heating electric soldering iron should be used.
2) When soldering wires and coaxial cables, use a 45W~75W external heating type electric iron or a 50W internal heating type electric soldering iron first. [What is the power of the soldering iron, how to choose the power of the soldering iron]
3) When soldering larger components, such as the lead pins of the line output transformer, the lead pins of the large electrolytic capacitor, and the grounding pads of the metal chassis, etc., an electric soldering iron with a power of more than 100W should be used.
Requirements for the use of electric soldering iron
1. Treatment of a new soldering iron before use A new soldering iron cannot be used immediately, the tip of the soldering iron must be treated before it can be used normally, that is to say, the tip of the soldering iron is coated with a layer of solder before use. The specific method is: first use a file to file the tip of the soldering iron into a certain shape as required, then connect the power supply, when the temperature of the tip of the soldering iron rises to the point where it can melt tin, apply rosin on the tip of the soldering iron, and then apply it after the rosin smokes. Put on a layer of solder, do this two to three times, so that a layer of oxide layer will be formed on the blade surface of the soldering iron tip and its surroundings, which will make it difficult to "eat tin". At this time, you can file off the oxide layer and re-plate it. solder.
2. Adjustment of the length of the soldering iron tip When welding integrated circuits and transistors, the temperature of the soldering iron tip should not be too high, and the time should not be too long. At this time, the length of the soldering iron tip inserted into the soldering iron core can be properly adjusted to control the temperature of the soldering iron tip. temperature.
3. There are two types of soldering iron tips: straight tip and elbow tip. When using the method of holding the pen, the electric soldering iron with straight tip is more flexible to use. It is suitable for soldering in circuits with many components. The electric soldering iron with curved iron tip is more suitable for the overhand grip method, and it is mostly used for soldering on the vertical desktop of the circuit board.
4. It is not easy to energize the soldering iron for a long time without using it, because it is easy to accelerate the oxidation of the soldering iron core and burn it out. At the same time, the soldering iron tip will be oxidized due to long-term heating, and even burned to "death" and no longer "eating tin".
5. When replacing the soldering iron core, be careful not to connect the wrong wires, because the electric soldering iron has three terminals, one of which is grounded, and the other two are connected to the two leads of the soldering iron core (these two terminals are directly connected to the 220V through the power line. connected to AC power). If the 220V AC power line is wrongly connected to the terminal of the grounding line, the shell of the electric soldering iron will be charged, and the welded parts will also be charged, which will cause an electric shock accident.
