Requirement
The UK based client had a requirement to perform manual ultrasonics on Cr 25% Super Duplex Weldments.
Forth Inspection Service was approached to develop the UT procedure & perform the testability trials in accordance with BS EN ISO 22825. ‘Non-destructive testing of welds. Ultrasonic testing. Testing of welds in austenitic steels and nickel-based alloys’.
Solution
Manual ultrasonics using a combination of various transducers was selected for the testability trials. The weld caps were ground flush which permitted a smooth transition for scanning from the parent material over the top of the weld. The ultrasonic testing process used a combination of angle compression transducers for the weld body, shear wave for the weld bevel fusion face & finally creep waves for the cap & root areas.
A full testability trial was performed in accordance with BS EN ISO 22825, where numerous Cr 25% Super Duplex welded samples containing seeded defects were successfully inspected.
Benefits
Performing the testability trials in accordance with BS EN ISO 22825 means that
- The correct transducer types are selected to limit the attenuation issues associated with the material
- The ultrasonic procedure will have a high POD for defects associated with Cr 25% Super Duplex Weldments
Source: https://forthinspection.com/case-studies/manual-ultrasonic-on-cr-25-super-duplex-weldments/