Welding Bridging Issues During PCBA Processing

printed circuit board assembly(PCBA) manufacturers, as the size of electronic devices continues to shrink, are faced with a whole new set of challenges. It is certain that the trend toward smaller and more compact electronic products will continue. Smart PCBA manufacturers are actively working to address these challenges in order to adapt to the changes and prepare for future development. The problem of welding bridges is a major challenge that all in our industry will have to overcome.

A common defect is welding bridging. It occurs when the welding flows into connectors, causing a short circuit or "bridge". It is not always obvious when welding bridging happens... but it can lead to serious damage of electronic components or devices. Bridging can happen at many points during the manufacturing process. Bridging can also occur when the welding paste is being printed. This occurs when the additional welding paste is squeezed between printed board and the steel mesh. Other factors can cause it, such as PCB manufacturing issues, pressure while placing electronic components, incorrect settings in the reflow-oven, etc. Bridging can be caused by board design issues, too much paste or other problems. It is a major headache for PCBA producers.

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