Tin is a phenomenon that the two metals are formed between the two metals due to diffusion, penetration, resulting in the detachment of the weld end electrode.
Handmade Tin Tips:
Hand immersion tin furnace is in use, if not paying attention to maintenance or error operation, it is easy to cause various problems such as cold welding, short circuit, and fake soldering.
First, the first is the temperature of the tin furnace, the tin furnace temperature will differ because of the tin, such as leading tin is usually 265 +/- 5 degrees, without lead tin, need to be 20 degrees. Of course, depending on the product, different PCBs are different, these need to slowly adjust to the most suitable temperature during the actual operation.
Second, the safe use of flux. The quality of the flux often affects the quality of welding. In addition, the activity and concentration of flux also have a certain effect on welding. If the activity of the flux is too strong or the concentration is too high, the waste of flux is created, but when the PCB board is performed in the first tin, there will be too much solder residue on the part, which will also cause waste of solder. If the flux is adjusted is too thin, it will cause the machine to eat tin and welding or the like.
When the flux is transferred, it is generally taken to try with the flux, then gradually add a diluent until the addition of the diluent welding effect will be deteriorated, then add a diluent slightly, and then try to be the best effect, at this time The specific gravity is measured with a specific gravity, and the standard is suitable at 0.80-0.82. This value can be grasped when prepared; in addition, the flux can not be added when the solder is used, and the diluent is added to the concentration of the concentration, and the diluent is added. During work, the flux tends to be closer to the tin furnace, which is easily volatilized in the flux, and the concentration of the flux is increased. Therefore, the specific gravity of the flux should be measured, and the diluent-free addition is added in time.
Physical properties of flux: Liquid. Divide color transparency, light yellow, white, yellow and other types. According to the use class, the proportion of flux flux / organic acid flux is used, and the proportion of flux is very important, and each class is checked and recorded.
Third, when using a foamed flux, the PCB plate is immersed when the flux is immersed, and the PCB panel surface is avoided to contact the flux. Normal operation should be: flux is immersed in 2/3 of the part foot. Because the proportion of flux is much smaller than solder, the lifting will be pushed up in the part foot until the part is pushed down to the PCB plate. If the immersion and flux can cause the flux to flux to flux, the residual dirt affects the quality of the tin liquid, but also cause a large amount of flux residual residue in the opposite side of the PCB board. It affects product quality if the resistance resistance of flux is inadequate or in the moisture environment and the conductive phenomenon. Of course, if you use a spray, you may not control the PCB without spraying the flux.
Fourth, the operational posture of the Tin is important, try to avoid the vertical immersion of the PCB plate in the tin liquid, and when the PCB plate is performed vertically into the tin surface, it is easy to cause "floating parts". It is also easy to generate "tin burst" (slightly "sound" "sound" sound, which is severely splashed. The main reason is that there is no preheating before the PC plate is soaked. When there is a part on the PCB board In-intensive, there will be cold air to expand rapidly. Thereby producing tin burst). The correct operation should be immersed in the surface of the PCB plate and the tin liquid. When the PCB plate is in contact with the tin liquid, the PCB plate is slowly pushed forward, so that the PCB plate is vertically in a vertical state, and then pulls from 30ο .
5. The main differences between manual tin furnace and wave furnace are: the wave furnace is driven by the motor, and the tin liquid is continuously sprayed through the pressure of the two-layer network to form a peak. This makes the tin lead alloy are always in a good working condition. The manual tin furnace is a static tin furnace because the proportion of tin lead is different. The long-term liquid standing will isolate tin lead to the welding effect. Therefore, it is recommended that customers should stir the tin liquid frequently during use (approximately two hours to stand up every two hours). This will make the tin-lead alloy integrate to ensure the welding effect. And almost every time, it is necessary to scrape the oxidation layer of the surface of the tin.
In addition, when a tin bar is added, the local temperature of the tin liquid will decrease and should be suspended. Waiting for the tin furnace temperature to start working properly. It is best to have a thermometer directly measuring the temperature of the tin liquid. Because some tin furnaces have gradually aged long-term use. The temperature of the instrument is poor in terms of the actual temperature; these are the problems that should be paid attention to in the operation of the hand immersion furnace.
Precautions:
1, the flux should be impregnated, the copper plate surface of the PCB plate is just in contact with the tin surface of 0.5 mm.
2, soaking time can not be too long, otherwise copper platinum foaming or burn. Be
3, the solder joint must be smooth and bright, the circuit board pads must be tin, do not have tin beads to adhere to the component surface line.
4. When the clip holder PCB board works, the clip must avoid the component; and the components cannot be encountered.
5. During the operation, don't touch the tin furnace to avoid burns. Be
6, flux, diluent should be a flammable material, storage and use should be away from the fire source. Be
7. Working during the work process is concentrated, and wear masks and gloves to ensure safety. Keep the work desktop clean, check the device, maintenance. Be
8. Non-professionals and unspecified personnel prohibit operating the equipment to ensure safety first.
Recommended reading: http://www.elecfans.com/Article/89/140/2017/20171213602977_a.html, Read more
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