Abstract
In situ crack detection in the mushy zone and the solid weld of a gas tungsten arc (GTA) weld using X-ray imaging during welding is a new research area for NDT inspection. Usually, NDT flaw detection is done after the complete solidification of the weld seam. In this paper, we present the use of real-time radiography with a minifocus X-ray source (YXLON X-ray tube Y.TU 225-D04) and a 75 μm pixel size digital detector array (Dexela 1512) for the acquisition of 2D radiographic images by a sequence of exposures with time intervals of 80 ms for hot crack detection during single pass bead-on-plate GTA welding of 3 mm thick plates of aluminium alloy AlMgSi (6060). An analysis of the crack distribution in the weld sample is conducted from the acquired 2D radiographs and its corresponding 3D volumetric reconstruction achieved by linear coplanar digital laminography. This in situ approach opens new possibilities in the field of hot crack research by having the direct information of both the crack initiation and growth and its correlation to the welding parameters.
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Acknowledgments
The authors want to thank K.U. Thiessenhusen, C. Bellon, M. Grunwald, D. Walter, A. Deresch and M. Tschaikner of Division 8.3 Radiological Methods, A. Hannemann of Division 9.4 Weld Mechanics and D. Stock, M. Richter and K. Scheideck of Division 9.3 Welding Technology of Bundesanstalt für Materialforschung und-prüfung (BAM) for their support.
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Recommended for publication by Commission V - NDT and Quality Assurance of Welded Products
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Boateng, F.T., Ewert, U., Kannengiesser, T. et al. Real-time radiography for observation of crack growth during GTA welding. Weld World 60, 931–937 (2016). https://doi.org/10.1007/s40194-016-0351-7
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DOI: https://doi.org/10.1007/s40194-016-0351-7