AOI (Automated optical inspection) is an important step of inspection in circuit board assembly process, it is an automated visual inspection of PCB(printed circuit board) assembly where a camera autonomously scans the SMD components under test for both catastrophic failure (e.g. missing component) and quality defects (e.g. fillet size or shape or component skew). This is a critical inspections process to ensure good quality of PCB assemblies.

In Weller, all the assembly production lines is equipped by AOI machine. All the PCB assembly production (even each prototypes) is implemented AOI inspection, rather than other suppliers who use manual power (by eyes) to have a visual inspection to the board.