| Autor: |
Thomas Joseph Bloodworth, Mikael Debroise, Dominic Marois, Dirk Verspeelt |
| Jazyk: |
German<br />English<br />Spanish; Castilian<br />French<br />Italian |
| Rok vydání: |
2023 |
| Předmět: |
|
| Zdroj: |
e-Journal of Nondestructive Testing, Vol 28, Iss 7 (2023) |
| Druh dokumentu: |
article |
| ISSN: |
1435-4934 |
| DOI: |
10.58286/28276 |
| Popis: |
The examination of welds for planar discontinuities whose plane lies perpendicular to the inspection surface is an inspection problem for which tandem ultrasonic testing has long been used as a solution. There exist standards that set out how to design a conventional tandem examination with 45° transverse-wave probes as well as how to design an LLT-tandem inspection in which angled longitudinal waves reflect from the far surface of a component so that they can undergo mode conversion on the face of a defect perpendicular to the surface and return to a receiving probe as transverse waves. For the End-of-Manufacture inspections of the high-integrity components of Hinkley Point C power station, the LLT-tandem technique has been applied to thick-section welds with internal cladding, by using phased-array probes to create a series of “crossing depth” configurations that cover the thickness of the weld. The considerations used for the design of the probes are explained. The resulting design covers the thickness with a 5 mm pitch with a single mechanical arrangement of two separate probes. The design enables coverage of welds with thickness exceeding 200 mm. Other multi-leg reflection modes are possible and the data analysts for these inspections were required to understand and recognise the other modes that could occur. The LLT-tandem inspections form part of multi-technique inspections for a number of high-integrity component welds that have been successfully subjected to Inspection Qualification prior to being used for the final examination of these welds. |
| Databáze: |
Directory of Open Access Journals |
| Externí odkaz: |
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