You might wonder: why aren’t solder balls allowed to appear? The reason is simple: a PCB board without solder balls looks more aesthetically pleasing. The acceptance standard for solder balls on PCBA boards is a key criterion for electronic equipment acceptance inspection. The size of solder balls on PCBA boards in PCBA processing is subject to requirements, which are determined based on customer needs because in our industry, customers are always considered as gods! Depending on different products and customer requirements, the acceptable requirements for solder balls may vary. Usually, standards are established based on national standards while considering customer needs.
In the IPC-A-610C standard, the minimum insulation gap is specified as 0.13 millimeters, and solder balls with a diameter within this range are considered acceptable. Solder balls with a diameter greater than or equal to 0.13 millimeters are deemed non-compliant, and corrective measures must be implemented by manufacturers to prevent this situation. The latest version of the IPC-A-610D standard for lead-free soldering does not clearly specify the phenomenon of solder balls. The provisions regarding less than 5 solder balls per square inch have been removed. However, standards for automotive and military products do not permit any solder balls, so PCB boards must be cleaned after soldering, either by using machine equipment or manually removing solder balls.
The Silman Tech PCBA cleaning machine DEZ-C758 is specifically designed for removing flux residues after wave soldering, replacing manual scrubbing to improve cleaning efficiency and cleanliness while reducing costs. It operates in fully automatic cleaning mode, eliminating operator contact with chemical liquids. Through multiple brushing processes, it efficiently removes flux residues from PCBA boards after soldering without wetting the front-facing components. The unique combination of roller brushes thoroughly cleans from multiple directions, eliminating dead corners and ensuring cleanliness.
