Controle non destructif par ultrasons des tuyauteries et des composants d'enceintes sous pression (diffraction et methode du temps de vol)

In this paper, as a new measurement method to estimate the change of material condition, the simplified ultrasonic CT system, which uses the information of three directions, that is, 90°, + 45° and −45° about inspection plane is proposed. Use of simplified CT system has two merits: Firstly, the measurement time is very short compared with general CT. Secondly, it can detect sensitively small defect in vertical or slant direction about inspection plane because the obtained image is CT image calculated from three directions. From these merits, this method can be considered as an effective method to evaluate material conditions. The basic performance of the proposed method was confirmed through several specimens with several simple defects. In order to confirm the applicability of actual NDT, several kinds of welded specimens are investigated. The result showed that the CT image obtained had good agreement with actual defect of specimens.

Time-of-flight diffraction technology for ultrasonic inspection of piping and pressure-retaining components

The Development of Simplified Ultrasonic CT System and Its Application to the Evaluation of Weld Metal

In this paper, as a new measurement method to estimate the structure change of weld metal, the simplified ultrasonic CT system, which uses the information of three directions, that is, 90°, +45° and -45° about inspection plane is developed. Use of simplified ultrasonic CT system has two merits: Firstly, the measurement time is very short comparing with general CT. Secondly, it can detect sensitively very infinitesimal defect in vertical or slant direction about inspection plane because the obtained image is not C scan image but CT image calculated from three directions. From these merits, this method can be considered as a very effective method for the evaluation of material condition. In order to compare the performance of simplified ultrasonic CT, the CT image obtained from several specimens with several simple defects was compared with the D scan image obtained by TOFD (Time of Flight Diffraction) method. We can see simple defects more clearly by new proposed method. Experimental results on several kinds of specimen, having welded joint by electron beam welding, welded joint by electron beam welding and fatigue crack showed that the obtained C scan or CT image has better resolution than the D scan image by TOFD method and shows similar image to actual shape.

Development of Simplified Ultrasonic CT System for Imaging of Weld Metal and It's Comparison with TOFD Method

In this research, as a new measurement method to estimate the infinitesimal change of material condition, the simplified ultrasonic CT system, which uses the information of three directions, that is, 90°, +45° and −45° direction about inspection plane is proposed. Use of simplified ultrasonic CT system has two merits: Firstly, the measurement time is very short comparing with general CT. Secondly, it can detect sensitively very infinitesimal defect in vertical or slant direction about inspection plane because the obtained image is not C scan image but CT image calculated from three directions. From these merits, this method can be considered as a very effective method for the evaluation of material condition. In order to know the applicability of actual NDT, several kinds of welded specimens are investigated. The result showed that the CT images obtained were very similar to actual defect of specimens. Also, in order to confirm the performance of simplified ultrasonic CT, the D scan image by TOFD method was obtained for the same specimen. The C scan or CT image gave better information than the D scan image obtained from TOFD method.

Time-of-flight diffraction technology for ultrasonic inspection of piping and pressure-retaining components

Citations

The Development of Simplified Ultrasonic CT System and Its Application to the Evaluation of Weld Metal

Development of Simplified Ultrasonic CT System for Imaging of Weld Metal and It's Comparison with TOFD Method

Ultrasonic Imaging of Material Condition Using Advanced Simplified Ultrasonic CT

System for ultrasonisk testing