Whether it is production or replacement of PCB assembly, there will be some solder slag left on the circuit board. Pcb cleaning is necessary to clean up the solder slag so that it will not affect the use of the circuit board.If the main reason for the shrinkage of the circuit board resistors is to leave flux residues on the circuit board, it is recommended to repair and clean the process to ensure the stability of the circuit board.If it is necessary to use no-cleaning processing technology, it is necessary to test the technical stability of the no-cleaning circuit board welding process in accordance with the IPC-SF-818 specification.The purpose is to evaluate the impact of post-soldering residues on quality reliability.
Why cleaning smd weld spatter such important ？
After the PCBA soldering process, there will generally be some solder scars left by the solder on the circuit board, which will not endanger the application of the circuit board after cleaning.
With the development of science and technology and the improvement of professional and technical personnel, there are more and more ways to remove welding scars.
Remove the solder from the original circuit board
The first method
First shake off the solder in the soldering iron, and melt the solder again. It can be repeated several times
Find a short section of multi-strand wire, attach rosin, melt together with the circuit board soldering, and take the cable away while it is hot, you can remove the excess solder.
If it is a large area of solder, you can use a special hot air torch or a solder furnace.
The second method
Clean up excess solder scars after circuit board soldering
Use industrial ethanol (or more than 95% ethanol), and use a soft brush dipped in ethanol to brush if it is very dirty.
Then blot with degreased cotton wool.
It is more convenient to use a tin suction device(protable desoldering gun,manual desoldering gun,electric desoldering gun,manual solder sucker,electric solder sucker), and the double-sided circuit board is more troublesome. Use the needle of the syringe to inject the soldering hole, insert and rotate the electric soldering iron after heating. Or take a piece of flexible wire (copper wire) and bring it up when it is melted.
If there is no tin suction device, you can quickly shake the printed board to shake off the tin slag while heating. Be sure to pay attention to safety and do not swing too much. When soldering with a soldering iron, remove the excess solder from the soldering iron tip to throw off the tin.
How to heat the solder
Hold the part on top of the pads using the tweezers and heat the pad using the soldering iron.
Apply heat on the joints in a circular motion. The iron will melt the paste. The flux will burn off.
Above is main content we sharing today . If you have more practical skills, please leave me a message in the message area below, and we will share them with you. I hope this will bring more convenience
How to clean PCBs
For electronic printed circuit board (PCB) assembly, you will find isopropyl alcohol being used to clean flux residues from recently soldered circuit boards or in PCB repair and rework. Using pcb cleaner is the most way .
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