The importance of PCBA during the welding process using AOI

PCBA during the welding process, due to human or machine often appear some bad welding, therefore, PCBA processing factories to ensure good welding quality, through the use of professional AOI testing equipment, strict process control over the quality of welding, welding defects can be found in time, can effectively improve the qualified rate of the final product. A defect, artificial visual inspection For PCBA before welding processing, generally USES the artificial visual inspection, but has a great deal of artificial visual inspection. People are prone to fatigue and influenced by emotions, artificial visual inspection has the problem of poor contingency, randomness and repeatability. Direction with the miniaturization of electronic components (such as SMT components such as 0201), manual visual inspection is becoming more and more difficult. Second, the importance of using AOI use AOI detection has higher stability, repeatability and higher precision, can be placed on the solder paste printing, components and after SMT reflow after each working procedure, such as can detect many welding defects in welding process. AOI can detect are: the content of the components, loss of polarity components, components, components misalignments, excess solder paste, components, flip, highly defect and insufficient adhesion and solder paste, become warped foot, registered, serious damage of components, the solder paste bridge, tombstone, volume defects, such as bridging defects. Behind the AOI in reflow soldering process is relatively popular choice, in this position can be found that the solder paste printing, assembly errors of component placement and reflow process, can effectively prevent the PCBA production in the process of welding defects, continue to flow to the next procedure, this is an important method of printed circuit board assembly welding processing factory to control quality.