In the daily production of SMT assembly factories, soldering defects often occur, among which false soldering and cold soldering are two common challenges. These issues not only affect the performance of the product but can also severely impact production schedules. Therefore, effectively addressing these problems has become a necessary challenge for us to face. Below, Charmhigh Electromechanical will discuss the handling strategies for SMT soldering defects, and interested parties can learn more about them.

I. Handling False Soldering Issues

False soldering is typically caused by poor solderability of SMT components and solder pads, incorrect reflow soldering temperature or heating rate, incorrect printing parameters, excessive dwell time after printing, and deteriorated solder paste activity. To address this issue, we need to take a series of measures. First, strengthen the screening of PCB circuit boards and chip components to ensure good soldering performance. Second, adjust the reflow soldering temperature curve to ensure that the soldering temperature and time meet the process requirements. In addition, change the pressure and speed of the squeegee to ensure uniform and defect-free solder paste printing. Finally, after solder paste printing, the chip reflow soldering should be performed as soon as possible to avoid prolonged dwell time that can lead to reduced solder paste activity.

II. Handling Cold Soldering Issues

Cold soldering is mainly manifested by dark and rough solder joints that are not completely fused with the welded object. This is often caused by inappropriate heating temperatures, deteriorated solder, excessive preheating time, or excessive temperatures. To address this issue, we need to adjust the reflow temperature curve provided by the supplier and optimize it based on actual production conditions. At the same time, replace the solder paste promptly to ensure its quality. Additionally, check if the equipment is working properly and perform timely repairs if necessary. Finally, adjust the preheating conditions and welding time to ensure stable and reliable welding quality.

In conclusion, addressing SMT soldering defects requires comprehensive consideration and solutions from multiple aspects, including materials, equipment, and processes. Only by doing so can we ensure the stable improvement of product quality and production efficiency.

Hunan Charmhigh Electromechanical is a professional manufacturer of SMT placement machines. If you have a need for SMT placement machines, please contact us, and we will provide you with efficient and professional services. If you wish to become our local distributor, we will provide you with mutually beneficial agency solutions.WhatsApp : +8618100733752 / WeChat : 86 18100733752 / Skype : 86 18100733752