How to use soldering iron
Grip of the soldering iron: There are three types:
The anti-grip method is to hold the handle of the electric iron in the palm with five fingers. This method is applicable to high-power soldering irons, and is connected to the welded parts with large heat dissipation.
The positive grip method, the electric iron used in this method is also relatively large, and most of them are curved iron tips.
Grip pen method, this method is suitable for low-power electric soldering iron, welding parts with low heat dissipation, such as welding radio, printed circuit board of TV and its maintenance.
Electric iron use precautions
1. The treatment of the new soldering iron before use. A new soldering iron can't be used. It must be processed before the soldering iron head can be used normally. That is to say, the soldering iron tip is coated with a layer of solder before use. The specific method is as follows: firstly, the iron tip is twisted into a certain shape as needed, and then connected to the power source. When the temperature of the soldering iron head rises to be able to melt the tin, the rosin is applied to the soldering iron head, and then the rosin is smoked and then coated. The upper layer of solder is doped two or three times, so that an oxide layer is formed on the blade surface of the soldering iron tip and around it, which causes a phenomenon of "eat tin". At this time, the oxide layer can be removed and re-plated. Solder.
2. Adjustment of the length of the tip. When soldering 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 on the soldering iron core can be appropriately adjusted to control the temperature of the soldering iron tip.
3. There are two kinds of soldering iron heads: straight head and elbow. When using the pen holding method, the electric iron of the straight iron head is more flexible to use. Suitable for soldering in circuits with many components. The electric iron for bending the iron head is suitable for the positive grip method, and is mostly used for welding under the vertical table of the circuit board.
4. The soldering iron is not easy to be energized for a long time without using it, because it is easy to cause the soldering iron core to accelerate oxidation and burn, and at the same time, the soldering iron tip will be oxidized by heating for a long time, and even burned "dead" and no longer "eat tin".
5. When replacing the iron core, pay attention to the lead wire. Do not connect the lead wire because the soldering iron has three terminals, one of which is grounded, and the other two are connected to the two cores of the iron core (the two terminals are directly connected through the power cable). Connected to the 220V AC power supply). If the 220V AC power cord is misconnected to the terminal of the grounding wire, the soldering iron casing will be charged and the welding part will be charged, which will cause an electric shock.
When soldering iron is soldered, it is best to use rosin flux to protect the soldering iron from corrosion. The soldering iron should be placed on the soldering iron stand.
1. It is better to use an adjustable balance temperature soldering iron;
2. When using for the first time, you must let the soldering iron mouth "eat tin";
3. When there is no need for a soldering iron, keep a certain amount of tin on the soldering iron mouth. Do not store the soldering iron mouth on the sponge and store it on the soldering iron frame;
4. The sponge needs to maintain a certain amount of water to make the sponge moist throughout the day;
5. When you pick up the soldering iron and start using it, you need to clean the soldering iron nozzle, but you don't need to put the soldering iron tip on the sponge to clean it during use. Just put the tin on the soldering iron mouth into the tin foil, so keep the soldering iron. The temperature of the mouth will not drop rapidly. If there is still difficulty in tin extraction on the IC, and some tin is added (the flux is contained in the tin wire), it is easy to extract more tin down;
6. The temperature of the soldering iron is between 340 and 380 degrees. If some sensitive components can only accept the soldering temperature of 240~280 degrees;
7. The soldering iron mouth is not suitable for metal parts such as blades, but it should be solved with rosin or tin wire;
8. After using it every day, clean it first, then add enough tin, then cut off the power immediately.
Electric iron use steps:
Preheat: The tip is at a 45-degree angle against the pad and component feet. The component legs and pads are heated in advance. The tip of the tip should not be placed against the copper plate without copper. This may burn the plate into a trace; the tip should be in the direction of the line: the tip should not be plugged: the warm-up time is 1-2 seconds.
On the tin: the tin wire is introduced from the contact surface of the component foot and the soldering iron; when the tin wire is melted, the wire speed is grasped; when the tin is full of the pad, the tin wire is removed; the tin wire cannot be directly placed on the soldering iron tip. To prevent the flux from burning black; the entire tinning time is about 1 to 2 seconds.
Take off the tin wire: Take the tin wire and put it on the pad; the time is about 1-2 seconds.
Remove the soldering iron: When the solder has only a slight smoke, you can remove the soldering iron: the solder joint is solidified. 
Editor in charge: Zhao Hongli
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