ポスト処理ファーズドアレイUTによる鋳鋼内欠陥のサイジング精度向上
Sizing Accuracy Improvement of Defects in Cast Austenitic Stainless Steel Using Post Processing Phased Array UT
著者:
山本 摂 Setsu YAMAMOTO 千星 淳 Jun SEMBOSHI 菅原 あずさ Azusa SUGAWARA 土橋 健太郎 Kentaro TSUCHIHASHI 安達 弘幸 Hiroyuki ADACHI 日隈 幸治 Koji HIGUMA
発刊日:
公開日:
Cast austenitic stainless steelPhased array UTPost processingUltrasonic testing
概要
Phased array ultrasonic testing (PAUT) has performed an important role for plant maintenances. However, many parts of cast austenitic stainless steels are difficult to be inspected by UT owing to their noises from large grains. We have been noticing that depending on the PAUT conditions, (e.g. incident angles and focal depths), the tendency of echoes from defects are different from that of grain noises. Thus we have developed new PAUT system which can analyze the tendency of echoes from comprehensive PAUT conditions. Moreover, in order to minimize the inspection time on-site, we have combined the algorithms and the full matrix capture (FMC) data acquisition system which can obtain full pattern raw waveforms. By synthesizing raw waveforms, any PAUT conditions could be arbitrary constructed off-site. In this paper, principles and setup of the system would be shown. Furthermore, results of performance verification using slits which fabricated in thick cast austenitic stainless steels would be represented.
