Ultrasonic imaging of welds using boundary reflections

Abstract

Articles you may be interested inAutomated flaw detection scheme for cast austenitic stainless stell weld specimens using Hilbert-Huang transform of ultrasonic phased array data AIP Conf.Quantitative evaluation of ultrasonic sound fields in anisotropic austenitic welds using 2D ray tracing model AIP Conf.ABSTRACT. Ultrasonic imaging can be applied for the inspection of welds to determine the type, position, and size of defects. By including boundary reflections in the path from transmitter to receiver, defects in the weld can be imaged from different directions using both reflection and diffraction signals. These images can be combined into a single figure providing a section view of the weld. The geometrical configuration must be taken into account for proper alignment of the subimages. These sub-images can be linked to conventional ultrasonic inspection techniques, such as the phased array tandem technique and time of flight diffraction.

Fusion of multi-view ultrasonic data for increased detection performance in non-destructive evaluation

“…Noise is not explicitly measured, but the implicit assumption is that noise is constant in all views; hence, the SEE function is a proxy for signal-to-noise ratio (SNR). It is clear from [6][7][8][9][10] that multi-view imaging provides additional information beyond that obtained in a single view that may aid manual characterization of defects. It also seems evident that the information in multi-view images should enable improved detection performance.…”

“…This gave a reasonable qualitative reconstruction of the crack shape. Hörchens et al [9] used a pair of oblique incidence ultrasonic arrays to inspect a weld from both sides using mode-converted shear waves in the component. By exploiting reflections from the top and bottom surfaces of the component and using the pair of transducers both as a pitch-catch pair and as individual pulse-echo devices, 10 different views of the weld were obtained using IWEX imaging.…”