Soldering requirements for PCB circuit boards in PCB assembly

PCBA welding processing, there are usually many requirements for the PCBA board, and the requirements must be met in order to weld.Then why does the welding process need so many requirements for the PCBA board? PCBA in the processing process, will go through a lot of special processes, the application of special processes will immediately bring a lot of special process PCB board requirements, if the PCB board problems will increase the difficulty of PCBA welding process may eventually lead to welding defects, plate unqualified, etc.

Therefore, in order to ensure the smooth completion of the special process, but also to facilitate PCBA welding processing, PCB board size, pad distance and other aspects should meet the manufacturability requirements, then PCBA processing plant -kinhford Electronics to take you to see the PCBA processing requirements for PCB board.

1.PCB size PCB width (including board edge) should be greater than equal 500mm, less than 460mm, PCB length (including board edge) should be greater than equal 500mm. The size is too small. It needs to be assembled.

2.PCB board side width Board side width: >5mm, plate spacing: 8mm, the distance between the pad and the plate:>5mm.

3.PCB bending edge width:>5mm, plate spacing: 8mm, the distance between the pad and the plate:>5mm.

4.PCB Mark point Mark shape: standard circle, square, triangle; The size of Mark; 0.8~1.5mm; Mark material: gold plating, tin plating, copper platinum; Mark surface requirements: smooth surface, smooth, no oxidation, no dirt; Requirements around Mark: There should be no green or other obstacles in the surrounding 1mm Mark color is significantly different; Mark position: more than 3mm away from the edge of the board, and no similar Mark holes or test points can be found in the surrounding 5mm. 

5. There is no through hole on the pad of the PCB pad patch assembly. If there is a through hole, the solder paste will flow into the hole, resulting in less tin in the device, or tin flow to the other side, resulting in uneven surface, solder paste can not be printed.

In PCB design and production, it is necessary to understand some knowledge of the PCBA welding process to make the product suitable for production. First understanding the requirements of the PCBA processing plant can make the subsequent manufacturing process smoother and avoid unnecessary trouble.

This is the specific requirements of PCBA welding processing for PCB board, not slack in the production of PCB board, the production of high-quality compliant PCB board can make the board better accept other special processes, and give the PCB board life, inject the soul of the function.