Welding is an important part of repairing electronic products. After the fault of the electronic product is detected, it is followed by welding.
Several heating methods commonly used in welding electronic products: soldering iron, hot air, tin paste, infrared, laser, etc. Many large-scale welding equipments use one or several combination heating methods.
Commonly used welding tools are
electric soldering iron, hot air soldering station, tin furnace, BGA welding machine
Welding accessories
solder wire, rosin, solder gun, solder paste, braided wire, etc.
Soldering iron is mainly used to solder discrete components of analog circuits, such as resistors, capacitors, inductors, diodes, transistors, field effect transistors, etc. It can also be used to solder integrated blocks of smaller QFP packages. Of course, we can also use it to solder. The CPU breaks the needle and can also make up the PCB board. If the gold finger of the graphics card or memory is broken, it can also be repaired with an electric soldering iron. The heating core of the soldering iron is actually a wire wound around a lot of turns. The length of the resistor or the material chosen for it is different, and the power is different. The soldering iron for ordinary maintenance electronic products generally uses 20W-50W. Some high-end soldering irons are made into constant temperature soldering irons, and the temperature can be adjusted. There is an automatic temperature control circuit inside to keep the temperature constant. The performance of this soldering iron is better, but the price is generally more expensive. It is a dozen or even dozens of ordinary soldering irons. Times.
The melting point of pure tin is 230 degrees, but the solder used for maintenance often contains a certain proportion of lead, which causes its melting point to be less than 230 degrees, and the lowest is generally 180 degrees.
The newly bought soldering iron must first be tinned. The upper tin refers to the soldering iron tip sticking to the solder, so that the soldering iron can be used normally. If the soldering iron is used for too long, the surface may be oxidized due to too high temperature, and the oxidized soldering iron It is not sticky tin, and such a soldering iron should also be processed by tinning in order to be used normally.
When removing or soldering resistors, capacitors, inductors, diodes, transistors, FETs, you can apply some solder to the pins of the components, which can better transfer heat, and all the components of the components can be melted. Take it off or solder it up. When the temperature is high during soldering, the soldering iron tip is lifted quickly after melting, and the solder joint is smooth, but if the temperature is too high, the pad or component is easily damaged.
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