Please introduce the two commonly used soldering irons

It depends on the use of the soldering iron you buy, the soldering iron for radio soldering can be selected from 20 to 40w (if the technology is good, the power can be larger, and the power for beginners is better to be small), it is best to be internal heating, and there is a point, the shape of the soldering iron head is very important, and it is the oblique soldering iron that is convenient for soldering, from the top of the world, generally more than 20 yuan can be, a few yuan to more than ten yuan has no quality assurance, love bad, and the welding effect is not ideal......

I use the following one, I bought it when I was in college, 58 yuan, the temperature can be adjusted, the soldering iron tip (about 5 yuan a) is the bevel that I changed myself, and the soldering circuit is very easy to use.

As long as there are 25W and 35W soldering irons used by repairmen, both can be used normally, but 35W should be in a hurry.

In addition, there is a soldering iron, press and hold the piston of the suction to put the tip of the soldering iron on the solder joint to be removed, release the piston, the solder will be sucked inside, and then press the piston to remove the solder.

It is better to have a ceramic heating core, don't be deceived. It is better to be able to adjust the temperature.

It is very famous to buy yellow flower cards.

Soldering irons can be divided into two types: external heating type and internal heating type. There are two commonly used internal heating electric soldering irons: 30W and 45W, which are suitable for the welding of electronic components and circuits.

When electricians repair motors, transformers and other equipment, they sometimes use external heating electric soldering irons, the power of this electric soldering iron is relatively large, from 45W to hundreds of watts, electricians commonly use 75W, 100W, 150W and 200W.

The length of the soldering iron tip can be changed by fixing the screw, and the temperature of the externally heated soldering iron tip can be adjusted.

There are two kinds of soldering iron tips of external heating electric soldering iron: straight and curved, which can be selected according to the construction environment.

Generally used are 35 watts and 50 watts, which are too large and easy to burn electronic components!

Before using the new soldering iron, use fine sandpaper to brighten the soldering iron tip, heat it with electricity, dip it in rosin and touch the solder wire with the edge surface of the soldering iron tip, so that the soldering iron tip is evenly coated with a layer of tin. In doing so, it facilitates soldering and prevents oxidation of the surface of the soldering iron tip. If the old soldering iron tip is severely oxidized and blackened, the surface oxide can be frustrated with steel to expose the metallic luster, and then re-tinned before it can be used.

The soldering iron should use 220V AC power supply, and special attention should be paid to safety when using it. The following should be done conscientiously:

It is best to use a three-pole plug for the soldering iron plug. Make the enclosure properly grounded.

Before use, the power plug and power cord should be carefully checked for damage. And check if the soldering iron tip is loose.

When using an electric soldering iron, do not strike it too hard. To prevent falls. When there is too much solder on the soldering iron tip, it can be wiped off with a cloth. Do not throw it indiscriminately to prevent burning others.

During the soldering process, the soldering iron should not be left around. When not soldering, it should be placed on a soldering iron holder. Note that the power cord should not be placed on the soldering iron tip to prevent accidents from burning the insulation.

After use, the power should be cut off in time and the power plug should be unplugged. Once cooled, retract the soldering iron into the toolbox.

First of all, you have to open the right temperature, if it is too high, it will oxidize, and then when you put it in use, you must remember to plate a layer of leaded tin, that is, the general 63 tin can, even if the tin is plated and put in use, it is recommended to lower the temperature, if it has been oxidized and blackened, use the soldering iron tip to burn rosin, burn it will rub, plating tin, and then rub, and then burn rosin, until it becomes brighter. When wiping with a damp and clean sponge, resistant to high temperatures, you should know.

Electric soldering iron is one of the indispensable supplies for electrical maintenance and production of electrical appliances, which is mainly divided into two categories according to the structure: internal heating electric soldering iron and external heating electric soldering iron. The internal heating electric soldering iron is mainly composed of five parts, which has the advantages of fast heating and high utilization rate.

The externally heated electric soldering iron is mainly composed of six parts, and the soldering iron is installed in the soldering core part, which can reach a higher temperature. Soldering irons are not difficult to buy in the market, and the following brands of soldering irons have a satisfactory quality and reputation.

Soldering iron brand

1.ATTEN (one of the most technologically powerful electronic instrument manufacturing companies in China, a high-tech enterprise, a well-known brand in Shenzhen, and an electronic company in Shenzhen).

2.Gaojie GJ (national standard drafting unit of electric soldering iron, a professional manufacturer integrating scientific research and production, ten major brands of electric soldering iron, Guangzhou Huanghua electronic tools).

3.GOOT (founded in 1965 in Japan, a professional manufacturer of electric soldering iron and related products, one of the top ten brands of electric soldering iron, and the Shenzhen representative office of Taiyo Electric Industry Co., Ltd. in Japan).

4.Sute Solderite (a professional manufacturer with lead-free soldering station as the leading product, a professional soldering R&D laboratory, ten major brands of electric soldering iron, and Shenzhen Sute Seiko Technology Co., Ltd.).

5.Hualun (a professional electronic equipment manufacturer integrating R&D, production and service, Shantou private technology enterprise, Shantou Hualun Electronic Equipment Technology Co., Ltd.).

6.Elsa Ersa (founded in Germany in 1921, the inventor of the world's first electric soldering iron, the provider of overall welding solutions for the electrical assembly industry, and the library contains Songerte electromechanical equipment (Shanghai)****).

How to use an electric soldering iron

1.Plug in the soldering iron to preheat.

2.Negotiate the pins of the capacitor and insert it into the printed circuit board.

3.Apply a small amount of solder paste to the contact between the capacitor pins and the circuit board.

4.Press the tip of the preheated soldering iron against the contact between the pin and the circuit board for a moment to raise the local temperature to the melting point of the tin wire. Send the solder wire to the contact between the pin and the soldering iron tip, remove the solder wire when the amount of solder is appropriate, and remove the soldering iron along the component pin to form a rounded solder joint.

5.Cut off the extra pins with diagonal pliers, and the soldering operation is completed. Tips: The residence time between the steps of soldering and the correctness of the operation have a great impact on the quality of soldering, which needs to be mastered gradually in practice.

When buying an electric soldering iron, you can take the above brands as a reference, each has its own advantages, and you can choose according to your needs. After purchasing a new soldering iron, the first thing to do is to measure the resistance between its plug and the metal housing, and the pointer of a normal soldering iron meter should not move. After that, observe the power cord, a good soldering iron should use a rubber cord, not a plastic cord.

In addition, you should also be extra careful when using an electric soldering iron.

You can get it for free

1. To select appropriate solder, low melting point solder wire for soldering electronic components should be selected.

2. Flux, dissolved in 25% rosin in 75% alcohol (weight ratio) as flux.

3. The specific method is to heat the electric soldering iron, and when the solder can just be melted, apply flux, and then evenly coat the soldering iron head with solder, so that the soldering iron head evenly eats a layer of tin.

4. Soldering method, polish the pad and the pins of the component with fine sandpaper and apply flux. After all the solder on the solder joint is melted and submerged in the component lead, the soldering iron tip is gently lifted up along the pins of the component to leave the solder joint.

5. The welding time should not be too long, otherwise it is easy to burn the components, and if necessary, you can use tweezers to clamp the pins to help dissipate heat.

6. The solder joint should be in the shape of a sine crest, the surface should be bright and smooth, with tin-free thorns and a moderate amount of tin.

7. After the soldering is completed, the residual flux on the circuit board should be cleaned with alcohol to prevent the carbonized flux from affecting the normal operation of the circuit.

8. The integrated circuit should be soldered last, and the electric soldering iron should be reliably grounded, or the waste heat should be used for soldering after the power is off. Or use a special socket for integrated circuits, and then plug in the integrated circuit after soldering the socket.

9. The electric soldering iron should be placed on the soldering iron stand.

I have been using an electric soldering iron for nearly ten years, and I personally think that if you want to learn it well, use it more, ask some experienced friends or teachers, and use it for a while, and the technology will definitely improve greatly!!

The use of an electric soldering iron is generally explained in detail on the box, and the only important lesson is not to touch the tip with your hands when it is hot.