SMT patch processing is an integral part of modern electronic manufacturing, yet welding cracks have always been a significant issue affecting product quality and reliability. Welding cracks can lead to circuit failure and even more severe safety issues. Therefore, understanding the causes of welding cracks in SMT processing is crucial for improving product quality and reducing production costs.

Here, Charmhigh Electromechanical explores the causes of welding cracks in SMT processing, and interested parties are invited to learn more about this topic.

During SMT processing, various factors contribute to the occurrence of welding cracks. Firstly, thermal stress and temperature gradients are major causes. The rapid heating and cooling experienced by PCBs and components during welding lead to the accumulation of thermal stress, resulting in stress concentration in the welding spots and solders, ultimately causing cracks.

Secondly, material mismatch and differences in ductility are common reasons for welding cracks. The material properties of different components and PCBs may differ, such as having different coefficients of linear thermal expansion. This can lead to stress accumulation during temperature changes. Additionally, differences in ductility between solders and substrates may cause solders to stretch under external forces, resulting in cracks.

Furthermore, excessive thermal cycling, high-temperature welding, prestress, and mechanical stress can also adversely affect welding quality. For example, during multiple temperature cycles or high-temperature welding, welding spots and solders may experience excessive thermal stress, leading to fatigue and cracks. The weight, size, and placement of components can also apply mechanical stress to welding spots, resulting in stress accumulation and cracks.

To reduce the risk of welding cracks, a series of measures need to be taken during SMT processing. Firstly, select the appropriate solders and substrate materials to ensure compatibility in terms of coefficients of thermal expansion and ductility. Secondly, optimize welding temperatures and cycles to avoid excessive heating and rapid cooling. Additionally, consider the layout and placement of components to reduce the impact of mechanical stress. Finally, conduct regular quality inspections and tests to identify and repair welding cracks promptly.

Charmhigh Electromechanical is a professional manufacturer of SMT patch placement machines. If you have any demand for SMT placement machines, please contact us. We will provide you with efficient and professional services. If you are interested in becoming our local distributor, we will offer mutually beneficial agency solutions.WhatsApp : +8618100733752 / WeChat : 86 18100733752 / Skype : 86 18100733752