In-Process Weld Inspections (2003-345)
- Newport News Shipbuilding
- BWXT Services, Inc.
NSRP ASE Investment: $67K
The welding community has long recognized that a convenient means of performing non-destructive evaluation of welds, either while welding or immediately after welding, could result in significant improvements in productivity and reduction in material loss, particularly in welds of heavy sections. Traditionally, non-destructive evaluation of welds is carried out using either x-ray or conventional ultrasonic testing long after welding has been completed. Neither of these technologies lends itself to evaluating the integrity of the weld while welding or shortly after welding. The high temperatures generated by the welding process and inability to monitor a partially completed weld joint are the main impediment to in-process or near real time weld inspection.
This project demonstrated the feasibility of using Electro Magnetic Acoustic Transducers (EMATS) technology for inspection of welds at ambient and elevated temperatures. This technology is a non-contact system of generating and receiving ultrasonic waves to evaluate the condition of surfaces and provide volumetric inspections of materials. Successful application of EMAT technology has been demonstrated for near real time inspection of submerged arc welds in shipbuilding applications.
Final Report – Approved for public release; distribution is unlimited