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Title: X-ray tomographic in-service inspection of girth welds - The European project TomoWELD

The new standard 'ISO 17636-2:2013: Non-destructive testing of welds - Radiographic testing - Part 2: X- and gamma-ray techniques with digital detectors', defines the practice for radiographic inspection of welded pipes for manufacturing and in-service inspection. It is applied in Europe for inspections of pipe welds in nuclear power plants as well as in chemical plants and allows a faster inspection with digital detector arrays (DDA) than with film. Nevertheless, it does not allow the evaluation of the depth and shape of volumetric and planar indications. In 2001 a planar tomography scanner, TomoCAR, was introduced for mechanized radiographic testing (RT) inspection and non-destructive measurement of cross sections. The project TomoWELD is based on a new concept of the scan geometry, an enhanced GPU based reconstruction, and the application of a new generation of photon counting DDAs based on CdTe crystal CMOS hybrids. The new detector permits the selection of energy thresholds to obtain an optimum energy range and reduction of the influence of scattered radiation. The concept and first measurements are presented. Flaw depth and shape of volumetric and planar irregularities can be determined.
Authors:
; ; ; ;  [1] ;  [2] ;  [2] ;  [3]
  1. BAM Bundesanstalt für Materialforschung, Berlin (Germany)
  2. TWI Technology Centre Wales, Port Talbot (United Kingdom)
  3. Oy AJAT Ltd., Helsinki (Finland)
Publication Date:
OSTI Identifier:
22391252
Resource Type:
Journal Article
Resource Relation:
Journal Name: AIP Conference Proceedings; Journal Volume: 1650; Journal Issue: 1; Conference: 41. Annual Review of Progress in Quantitative Nondestructive Evaluation, Boise, ID (United States), 20-25 Jul 2014; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; 71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; CADMIUM TELLURIDES; CHEMICAL PLANTS; COMPUTERIZED TOMOGRAPHY; CRYSTALS; DEFECTS; DEPTH; GAMMA RADIATION; IN-SERVICE INSPECTION; NUCLEAR POWER PLANTS; PHOTONS; THIN FILMS; WELDED JOINTS; X RADIATION