What is Inclusion
Inclusion refers to the presence of foreign particles or contaminants in the conductive layer, plating, or base material of a PCB. These foreign particles can be introduced during the manufacturing process and may negatively impact the quality and reliability of the PCB.
Inclusions can weaken the cross section of solder joints, leading to potential issues with the integrity and performance of the PCB. They are often caused by pollution in the solder pot of the wave soldering unit, where foreign particles or contaminants enter the solder joint during the wave soldering process. As a result, rework becomes necessary to address the inclusion by removing the contaminated solder joint and replacing it with a clean joint.
To ensure the overall quality and reliability of PCBs, it is important to prevent the occurrence of inclusions. This can be achieved through proper maintenance and cleanliness of the manufacturing equipment, as well as implementing effective quality control measures throughout the production process. By minimizing inclusions, the PCB industry can ensure the consistent performance and functionality of electronic devices that rely on these circuit boards.