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Causes and treatment of white residue after PCB plate welding

494 Published by FASTPCBA 7月 24,2018

 PCB plate welding

In the process of PCB circuit board production, welding is an indispensable and important process. After the completion of the PCB circuit board welding, white residues are sometimes found on the circuit board, which affects the appearance of the circuit board and may affect the performance of the circuit board.Therefore, we need to understand the causes of these white residues and deal with them.

Causes and treatment of white residues after PCB circuit board welding:

  1. The appearance of white residues is generally caused by improper use of flux, and rosin flux often produces white spots during cleaning.This phenomenon is sometimes prevented by switching to other types of flux.
  2. If there is any residual substance on the circuit board when it is made, white spots will occur when it is stored for a long time. Strong solvent can be used for cleaning.
  3. The wrong treatment of circuit boards will also lead to white spots, often a batch of circuit boards will occur problems, but others will not, for this phenomenon with a strong solvent cleaning can be.
  4. The soldering flux was not compatible with the oxidation maintenance, so it can be improved by changing to another soldering flux.
  5. As the solvent in the manufacturing process degrades the PCB board raw materials, there will also be white residues, so the shorter the storage time is, the better.
  6. The soldering flux has been used for too long. When exposed to the air, it absorbs water and forms white spots. When using fresh soldering flux, the soldering tin will stay for too long before cleaning.

If there is white residue after PCB plate welding, it needs to be taken seriously, analyzed the causes and targeted solutions.Only in this way can PCB circuit board have good performance and clean appearance.PCB plate welding

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