In the ultrasonic testing (UT) for weld part of austenitic stainless, it is generally recognized that the UT inspection has difficulty due to dispersion, attenuation, and so on. And, in UT results even for defect-free area of austenitic weld metal, echoes originated from root, columnar structure and interface between weld metal and base metal are observed with some continual variation throughout weld line. UT simulation is a very useful technique for understanding the phenomena in the ultrasonic wave ...
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Simulation of UT signal for columnar structure of weld metal of stainless steel piping

It is well known that volumetric inspection by ultrasonic testing for cast austenitic stainless steel (CASS) piping, which is extensively used in primary loop of Japanese pressurized water reactors (PWR), is challenging due to unexpected beam skewing, dispersion and attenuation by its coarse and anisotropic crystal structures resulted from manufacturing process. The miss or false calling of the flaws and the deterioration of sizing performance are of great concerns in the ultrasonic testing for the ma...
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Simulation of Ultrasonic Wave Propagation in Cast Austenitic Stainless Steel Piping

An ultrasonic phased array technique has many advantages over conventional ultrasonic testing method. The phased array will eventually replace conventional ultrasonic NDT methods. However, the transition to phased array has several challenges. In this paper, phased array and conventional ultrasonic angle beam technique were compared under the aspect of weld testing. The detection and length sizing results of both methods for carbon steel butt welds were equivalent. Keywords: Phased array, Ultrasonic Test...
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Optimization of testing conditions for phased ultrasonic UT of welds

Abstract Ultrasonic testing (UT) is the most appropriate non-destructive testing because of capabilities for detection and depth sizing of flaw. But it is generally said that the flaw detection in austenitic weld is difficult because of dispersion and attenuation of the ultrasonic wave.UT simulation is a very useful technique for understanding the phenomena in the propagation of ultrasonic wave and for evaluating the UT results.On UT simulation for weld used austenitic welding material, modeling of co...
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UT simulation of dissimilar metal weld joint utilizing solidification simulation technique

As one of plans to improve a skill of UT inspector, a methodo utilize ultrasonic waves predicted by UT simulation is su ggested. Therefore, modeling methods of metal microstructurebased on solidification simulation and the actual flaw dete ction conditions were developed, and UT simulation is carried out using the models. The validity in the simulation model is verified compared with experimental results. A method to apply simulation results to UT skill training is suggested....
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Application of FEM simulation for UT skill training

In ultrasonic testing for austenitic welds, it is generally said that the flaw detection in the weld is difficult because of spurious echoes by dispersion of the ultrasonic wave. Therefore, the ultrasonic examination personnel are required to have high level abilities to classify these echoes. It is important to train to maintain and improve the abilities. For the effective training, many samples are need with a variety of flaw characteristics and size. However, it is difficult to prepare such samples...
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Defect Model in TU simulation for UT training tool