Water Path Control in Adhesive-Bonded Metal Panels- A Practical Guide
https://weld-inspection-insights.scriblorax.com/posts/choosing-an-ndt-method-for-lifting-attachments-common-pitfalls-and-fixes
Water Path Control in Adhesive-Bonded Metal Panels: A Practical Guide Bonded metal sheets may need checks for changes in bond quality. Water carries sound between the transducer and the part without firm probe contact