The hot air gun is one of the most used tools in the repair of mobile phones or electrical appliances. The hot air gun uses the hot air blown from the core of the heating resistance wire to weld or remove the components. The main part of the hot air gun control circuit should have temperature signal amplification circuit, comparison circuit, thyristor control circuit, sensor and wind control circuit. Let me talk about how to use the hot air gun.
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　 How to use the hot air gun
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1. The hot air gun can blow solder some small chip components. The small chip components in mobile phones generally have chip resistors, chip capacitors, blood heat, and chip inductors. Turn on the hot air gun switch, you can start welding. When using the hot air gun, remember to master the air volume of the hot air gun, because improper operation will cause damage to small components. When blowing some small chip components, it is enough to use a small nozzle nozzle to adjust the temperature of the hot air gun to 3rd gear and the wind speed to 2nd gear. Then it can be used. When using it, it can be clamped with small chip components with tweezers. The hot air gun and the component should be kept vertical, and the heating should be uniform.
2. Blow soldering integrated circuit should apply proper amount of flux on the surface of the chip, this is to prevent dry blowing, and can evenly melt the solder joints. Blow welding uses a large nozzle nozzle, the temperature is adjusted to 4 gears, the air volume is adjusted to 3 gears, and the distance is 2.5CM.
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　　 Classification of hot air gun
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normal type
This type of hot air gun is mainly due to unstable temperature, high and low, and unstable air volume. The scale of this air gun is only to adjust its power, so the temperature is very slow when it is turned on for several minutes, and then the temperature rises linearly, and it will burn out with little care. Such as power amplifier, CPU, circuit board, etc. Although it also has temperature detection, it seems to only be used for over-temperature protection, but not to adjust the temperature value. It is recommended that you do not often lose money in order to save money.
　　 Standard type
The scale of this type of hot air gun is really used to adjust the temperature. It heats up quickly when it is turned on, and it can be reached in tens of seconds. The temperature will not rise linearly. It can be adjusted within a small range, and the air volume is relatively stable.
　　 Digital temperature display type
This kind of performance is basically the same as the second kind, that is, there is more digital temperature display, and some are accurate and very accurate. However, some display temperature is not accurate, it is easy to produce errors. In addition, according to the difference between the manufacturer and the production, it may not be practical for a long time ago. At the same time, some machines have power or other voltage and current indicating dials. Some parts can be replaced. If you are using a hot air gun without a digital temperature, you can use the air gun to blow a piece of paper at 3 cm to estimate. If the paper does not turn black quickly, it will be yellow.
　 High temperature type
The temperature of the high-temperature hot air gun can reach 800 ℃ or even 900 ℃, and it must be fixed on the equipment and connected with compressed air or high-pressure air source before it can be used. High-temperature hot air guns are generally built with 1 to 2 temperature sensors for temperature control, and also have a built-in anti-drying device to prevent the heating wire from overheating due to lack of wind and burning out.
The above is the introduction about the use method and classification of the hot air gun. The process requirements of the hot air gun are very high. In different situations, the temperature and air volume of the hot air gun have different requirements. Too low a temperature will cause virtual soldering of the component. Too high a temperature will burn the component and the circuit board. If the air volume is too large, the small components will be blown away, so the hot air gun must be selected correctly.
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