C209 レーザ超音波を用いた厚肉溶接部検査技術の開発(亀裂の検査・モニタリング技術-(3),OS5 保全・設備診断技術),動力エネルギーシステム部門20周年,次の20年への新展開)

概要

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Manufacturing large structures witch needs thick welding, repairing and re-welding time increase in cost if inspection results are rejected after the whole welding process. Therefore, we have developed Laser-ultrasonic in-process testing (LUT) technique during welding at high temperature. LUT is applicable to high-temperature structure due to non-contacting inspection technique. However, detection sensitivity of LUT is low comparing with common piezoelectric transducer, so inspection for thick structures by LUT is difficult. Thus we have developed Synthesis Aperture Focus Technique (SAFT) for in-process and thick welding parts. In this paper, we show the inspection result of 150mm thickness with φ1.0mm Side Drilled Hole (SDH) and in-process welding inspection at high temperature.
2010-06-20