X-ray Inspection for PCBA – Challenges and New DevelopmentsAuthors: David Geiger, Elbert Suen, Zhen (Jane) Feng, Ph.D., Weifeng Liu, Ph.D., Anwar Mohammed, Ph.D., Mike Doiron, Evstatin Krastev, Ph.D., Peter Chipman
Company: Flex, Nordson Dag, Optimum Design
Date Published: 9/17/2017 Conference: SMTA International
Automated X-Ray inspection (AXI) has been available since 1999 at our manufacturing sites, and plays very important role to assure high quality SMT process. Along the way, manual X-ray systems (2DX and 3D CT) have been providing invaluable testing capabilities for verifying the AXI results, fine tuning the AXI parameters, process development, and X-ray inspection that is out of the scope of the AXI equipment.
Through the years these capabilities have been significantly improved and best practices have been developed on how to jointly use the AXI, 2DX(MXI), and 3D CT X-ray equipment to achieve best possible testing results and speed. In this paper, we will summarise the extensive experience we have accumulated while working on real problems together with our customers, X-ray inspection vendors and R&D teams. These projects include BGA HIP (head in pillow), solder charge connector, Package on Package, package 03015. In addition, we will discuss how to optimize test coverage and eliminate defect escapes during PCBA testing. These studies have been performed using variety of X-ray inspection systems at several production sites and lasted several years.
We will also discuss the X-ray inspection capabilities that are considered most important to the PCBA manufacturing process including: 1. Highest resolution X-ray images and clear distinction between good and defective pins; 2. Measurement data from inspection output; 3. Operator independent automated results for pass/fail condition; 4. Non-destructive e-cross section; 5. Easy and intuitive operation and programing; 6. Real time data feedback; 7. Flexible automated algorithms that are easily adjustable by the machine operator; 8. Zero defect escape with reasonable false call PPM.
X-ray technology, AXI, 2DX(MXI), 3D CT, Large Board CT, pCT, Optimization.
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