1. What is an SMD desoldering station?
Electronic components in electronic products are made up of many components, most of which are formulated from metals. When repairing an electronic product, there must be a way to disassemble it or place it in a designated place. The only way to repair the pcb of electronic products is to melt the connectors of the electronic components to be repaired, then combine or disassemble it, these are what the desoldering station does, and the desoldering station can provide the required heat, and can help repair engineers complete the soldering work.
SMD rework station is a necessary soldering tools for achieving professional results.
Desoldering stations, also known as rework stations, have soldering capabilities that allow operators to easily repair metal with metal solder. The hot air flow generated from the desoldering station can also be used to melt the solder, making it liquid for a short period of time.
2. How big is the soldering tip used for patch soldering?
When choosing a soldering iron, it is important to consider the space of the circuit board of the electronic product to be soldered. There are many electronic components on the circuit board to be soldered, and components with loose solder are prone to occur.
My suggestion is to choose a chisel tip between 1 and 2mm. Due to its shape, it is not only small and convenient to use, but also ideal for heat transfer.
3. SMD soldering temperature
Temperature range of soldering station: The output temperature range is 100° ~ 480°C.
The SMD soldering temperature is determined by the content of lead in the solder, and the temperature of leaded solder is lower than that of lead-free solder.
The melting point of ordinary lead-free solder is 210-230 degrees, and the working temperature is 245-280 degrees. According to the different tin content, the lead solder has a melting point of about 180 degrees, and the working temperature is 240-250 degrees. When the tin content is reduced by 3%-5%, the melting point increases by about 10 degrees, and the working temperature increases by 10-20 degrees.
4. How to disassemble the SMD
Generally speaking, it is not so easy to remove the SMT processing components.
SMT desoldering: first tin on one of the pads on the PCB board, then use tweezers with left hand to clamp the component, put it on the install place to press against the circuit board, and use a soldering iron to solder the pins on the tinned pad in the right hand. Remove the tweezers and solder the rest of pins with tin wire. If you want to disassemble such components, it is also easy to use a soldering iron to heat both ends of the component at the same time. After the tin has melted, you can remove the component with a gentle lift.
The method for soldering SMD is very similar to how we solder resistors.
Start by applying flux to the pads on the board.
Then apply solder to one pin of the chip
Use tweezers to clamp both ends of the component, then place the chip and align
Hold the chip in place while touching the pads with the tip of the soldering iron so that the solder melts the pins and pads together.
Check the alignment of the chips. If it's not in its place, tap with a soldering iron, loosen the pin chip and align the chip properly
Continue soldering on the diagonal by putting a bit of solder on the tip of the soldering iron and then touching the board pads and pins at the same time. Repeat this for all pins of the chip.
After soldering all the pins, be sure to carefully inspect the solder joints with a magnifying glass and check for bad joints or cold solder joints.
SMD desoldering and soldering is not an easy task for beginners. Once an error occurs during the operation, the SMD will be damaged. So before SMD soldering, we can practice the operation repeatedly on the scrapped PCB and watch the related soldering video. Make yourself familiar with SMD soldering before operating, so as to avoid soldering mistakes as much as possible.
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