Abstract
The thick welded part was conventionally inspected by the ultrasonic testing (UT) after welding. If the UT could be performed during welding, it should save time and cost of manufacture. Therefore, we have developed in-process Laser-Ultrasonic Testing (LUT) technique during welding at high temperature. LUT is applicable to structure with high temperature because of its non-contacting feature. In addition, to apply the LUT to thick welding parts having a thickness of more than 100mm we have developed Synthesis Aperture Focus Technique (SAFT) for sensitivity improvement of LUT. In this paper, we show the in-process testing result of drilled specimen and actual 150mm thickness pipe in high temperature more than 200 degrees C.
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