What Is a Heat Gun?

The hot air gun is mainly a tool for welding and extracting components by using the hot air blown from the core of the heating resistance wire. According to the working principle of the hot air gun, the main part of the control circuit of the hot air gun should include a temperature signal amplifier circuit, a comparison circuit, a thyristor control circuit, a sensor, and a wind control circuit. In addition, in order to improve the overall performance of the circuit, some auxiliary circuits should be provided, such as a temperature display circuit, a shutdown delay circuit and a zero-crossing detection circuit. The temperature display circuit is set to facilitate temperature adjustment. The temperature displayed by the temperature display circuit is the actual temperature of the circuit. Workers can manually adjust the temperature according to the temperature displayed on the display during the operation.

Hot air gun is one of the most used tools in mobile phone repair, and the process requirements are also high. Hot air guns are used to remove or install small components to large integrated circuits. In different occasions, there are special requirements for the temperature and air volume of the hot air gun. If the temperature is too low, the components will be soldered. If the temperature is too high, the components and circuit boards will be worst. The air volume is too large to blow off the small components, and the choice of the hot air gun is also very important. Do not choose a low-grade hot air gun because of the price. ^[1]

Tips and methods of using hot air gun :

1. Do not use hot air gun with chemical (plastic) scraper.

2. Please remove the dry paint of nozzle or scraper after use to avoid fire.

3. Please use it in a well-ventilated place, because the residue removed from the paint of lead products is toxic.

4. Do not use the hot air gun as a hair dryer.

5. Don't point the hot wind directly at people or animals.

6. When the hot air gun is used or just after use, do not touch the nozzle. The handle of the hot air gun must be kept dry, clean and away from oil or gas.

7. The hot air gun must be completely cooled before it can be stored.

50 --150 (122-300OF) Thaw the freezing tube

205 230 (400450 OF) Bend plastic pipe or soften dry paint or powder

230 290 (450--550 OF) to soften the adherend

425 455 (800850 OF) to soften the weld

480 510 (900 OF950 OF) loosen the rusty bolt

520 550 (1000 OF1100 OF) can remove paint

550 -(1022 OF) start to zoom charcoal

1. Before use, make sure that you have reliably grounded to prevent static electricity on the tool from damaging the components.
2. It should be adjusted to a suitable temperature and air volume, and the temperature and air volume of the hot air gun should be adjusted according to the shape of the different nozzles and the characteristics of the working requirements; the soldering time of the small components such as resistance and capacitance is about 5 seconds, and the general IC soldering time is 15 About 30 seconds for small BGA, about 30 seconds for large BGA, and about 50 seconds for large BGA. The temperature is adjusted by 4 levels. The digital ATTEN850D uses the A1130 nozzle to adjust the air volume by 3 levels and the temperature by 350 degrees; when the nozzle is not used, the air volume is adjusted by 4.5 steps and the temperature is adjusted by 380 degrees.
3. When the power switch is turned on, preheat the hot air gun to a stable temperature before welding. When using the soldering iron, heat the inaccessible components evenly at 1 ~ 2CM above the components. During the desoldering process, pay attention to protect the surrounding components. Security.
4. Do not apply excessive force when installing the nozzle, do not hit the work table with a soldering iron to give a strong impact, to avoid damage to the heating wire and high temperature glass.
5. Be very careful in high temperature operation. Do not use the hot air gun near flammable gas or flammable objects. Pay attention to personal safety. When replacing parts, leave the power off and allow it to cool. Unplug it for a long time.
6. When the work is completed, turn off the power switch. At this time, the automatic cooling period begins. Do not remove the power plug during the cooling period ^[2] .