8618520826307
info@pcba-china.com
enEnglish

AOI Inspection

AOI Inspection
Details:
On Shenzhen STHL Technology Co., Ltd.'s production lines, one process acts like an eagle's eye, constantly monitoring every PCB — AOI Inspection. Unlike manual visual inspection, which can suffer from fatigue and miss subtle anomalies, AOI Inspection uses high-speed industrial cameras and intelligent algorithms to capture the condition of every solder joint and every trace. Under the lens of Automated Optical Inspection, any misalignment, cold solder joint, or solder bridge is instantly detected.
Send Inquiry
Description
Send Inquiry

From Solder Paste to Post-Soldering: Full-Process Optical Protection

 

AOI Inspection is not just a single checkpoint - it is a quality safeguard that spans the entire SMT manufacturing process:

  • Solder Paste AOI: After solder paste printing, inspects thickness, area, and position to prevent downstream soldering issues caused by poor printing.
  • Pre-Reflow Inspection: An optional step to detect placement misalignment, missing components, and other defects before they enter the reflow oven.
  • Post-Solder AOI: After soldering, performs a comprehensive inspection of solder joint shape, solder volume, cold joints, and solder bridges to ensure soldering quality meets standards.
  • PCB AOI Inspection: Conducts a full-coverage scan of the appearance and soldering quality of bare or assembled PCBs, ensuring trace integrity and pad condition.
aoi-1

 

AOI Inspection's Working Principle

 

  • Image Capture: Multi-angle lighting illuminates the PCB, while a high-resolution camera captures fine details.
  • Intelligent Comparison: Pixel-by-pixel comparison of captured images with CAD data or a golden sample.
  • Defect Identification: Flags misalignment, missing components, solder anomalies, and trace defects.
  • Instant Feedback: Inspection results are sent to the production line in real time, enabling immediate process adjustments.
aoi

 

Why AOI Inspection Is a Must-Have for Modern PCBA Manufacturing

 

  • Accuracy: Micron-level detection catches deviations invisible to the naked eye.
  • Speed: Synchronized with SMT cycle times, full inspection does not slow production.
  • Consistency: Immune to human fatigue, ensuring uniform inspection standards.
  • Traceability: Inspection data can be archived long-term for quality analysis and customer reporting.
aoi-2

 

Typical Issues Detected by AOI

 

  • Insufficient / excessive solder.
  • Solder bridges.
  • Component offset, reversal, or absence.
  • Lifted leads, tombstoning.
  • Opens, shorts, and line width/spacing violations.
  • Excess copper, missing pads, damaged vias.

 

FAQs

 

Q1: Can AOI Inspection replace manual inspection?

A1: In most cases, yes - but manual review may still be needed for certain cosmetic defects.

Q2: Does Automated Optical Inspection affect production cycle time?

A2: Modern high-speed AOI systems can synchronize with production line cycles without creating bottlenecks.

Q3: What is the difference between Post-Solder AOI and Solder Paste AOI?

A3: Post-Solder AOI inspects solder joint quality after soldering, while Solder Paste AOI checks solder paste quality after printing. Using both significantly reduces soldering defects.

Q4: Is PCB AOI Inspection suitable for low-volume production?

A4: Yes - especially for high-value or high-reliability products, AOI can greatly reduce post-production rework costs.

 

Conclusion

 

At STHL, we regard AOI Inspection as the "eagle eye" of the production line. Through a multi-stage approach combining Automated Optical Inspection, PCB AOI Inspection, Solder Paste AOI, and Post-Solder AOI, every PCB undergoes rigorous optical scrutiny before shipment. This not only ensures we deliver qualified products but also helps our customers win trust and reputation in the market.

 

If you'd like to add an efficient, precise quality assurance layer to your products, send your requirements to info@pcba-china.com - we look forward to hearing from you.

 

 

Hot Tags: aoi inspection, China aoi inspection manufacturers, suppliers, factory, PCB In Circuit Test, Inline Solder Paste Inspection, pcb thermal cycling test, System Level Test, Functional Testing, PCB Functional Test

You Might Also Like
Send Inquiry