In order to ensure the overall quality of aluminum substrate PCB,that high quality solder should be used in the production process to improve the welding performance of PCB and prevent warpage and defect.So, what are the causes of PCB welding defects on aluminum substrate?Follow the professional aluminum PCB manufacturers of Yongmingsheng to understand.
Due to the poor solderability of the circuit board hole, there will be virtual welding defects, affecting the parameters of the components in the circuit, causing the components and the inner layer of the line conduction instability, resulting in the overall function of the circuit failure.
The circuit board and components will warp in the welding process, and the stress and deformation will lead to virtual welding, short circuit and other defects.Warping is usually caused by a temperature balance between the upper and lower parts of a circuit board.For large polypropylene, the board warps due to its own weight.
From the design point of view, the circuit board size is too large, although the welding is easy to control, but the printed line is longer, the impedance increases, the cost increases;The size is too small, the heat dissipation is reduced, the welding is not easy to control, and the mutual interference of adjacent lines is easy to occur.
So the design of PCB board must be optimized:
A. Reduces connections between high frequency components and reduces electromagnetic interference.
B. For heavy parts, fix them with brackets and then weld them.
C. Thermal elements should be considered heat dissipation, thermal elements should be away from the heat source.
D. The components are arranged in parallel as far as possible, which is not only beautiful, but also easy to weld and suitable for mass production.The best design for a circuit board is a 4∶3 rectangle.Do not change the wire width suddenly and avoid using large areas of copper foil.
The above is the cause of welding defects in PCB of aluminum substrate. I hope it can be helpful to you.We are from China’s aluminum substrate supplier – Yongmingsheng Electronics, welcome to consult!