Outer layer AOI November 9, 2020 By Wellerpcb Team 546 views Similar with inner layer AOI the imaged and etched panel is scanned and compared to make sure that the circuitry meets design and that it is free from any defects. WELLER do not allow to repair any welding or open circuit. Likes (0) CONTACT US NOW Attachment: ( a .zip or .rar file, max 25MB ) We’ll do our best to get back to you ASAP. Please enable JavaScript for this form to work.