The key points of post-SMT soldering processing include the following

Welding temperature: The appropriate welding temperature is the key to ensuring the quality of solder joints. Too high a temperature may lead to problems such as solder oxidation and component damage, while too low a temperature may lead to problems such as poor solder flow and insufficient solder joints.

Welding time: Too long or too short a welding time can affect the quality of the solder joint. Too long a time may lead to problems such as oversized solder joints and solder flowing, while too short a time may lead to problems such as insufficient solder joints and cold solder joints.

Soldering amount: The proper amount of soldering is the foundation for ensuring the quality of solder joints. Too much or too little soldering will affect the mechanical properties and appearance of solder joints.

Pad processing: The cleanliness and roughness of the pad surface have a significant impact on the quality of the solder joint. It is necessary to ensure that the pad surface is clean, free of oxide film, oil, and other impurities.

Pin processing: The surface quality of the pin has a significant impact on the quality of soldering. It is necessary to ensure that the surface of the pin is clean, free of oxide film, oil, and other impurities, and the extension length of the pin needs to be adjusted to make it consistent with the height of the solder pad.

Welding method: Adopting appropriate welding methods can ensure the quality of solder joints, such as using appropriate soldering iron head shapes and adding appropriate flux.

Component placement: The location and orientation of components need to meet design requirements, and alignment between components and pads needs to be ensured for ease of soldering.

Welding quality inspection: After welding, it is necessary to conduct quality inspection, such as using magnifying glasses or microscopes to inspect the quality of the welding points, to detect and address problems in a timely manner.

These are some key points for post SMT PCB soldering processing, mastering which can effectively improve solder joint quality and production efficiency.