Analysis and control of solder joints failure of plug-in capacitors

The repeated failure of a plug-in capacitor solder joint occurs in an equipment in the process of long-term use, which has certain effect on the function and performance of the equipment. This paper analyzes the cause of the failure, by SEM、 EDS and anatomy of the solder joint, it is found that the legs of the capacitor are oxidized, resulting in cracks during soldering. By oxide layer removing and tining, it can effectively improve wettability and reduce the risk of defects, achieve the purpose of improving product quality.