Application of Ultrasonic Testing for Weld Joints in Stainless Steel Water Gates

Oshima, Takahisa; Kabushiki Kaisha IHI Yokohama Engineering Center; Japan

Oshima, T.; IHI Corporation; Japan
Nagai, Y.; IHI Corporation; Japan
Hatanaka, H.; IHI Corporation; Japan
Yokoyama, M.; IHI Infrastructure Systems Co. Ltd; Japan
Asano, T.; IHI Infrastructure Systems Co. Ltd; Japan
Fukushima, N.; IHI Infrastructure Systems Co. Ltd; Japan
Takeda, Y.; IHI Infrastructure Systems Co. Ltd; Japan

ID: ECNDT-0141-2018
Download: PDF
Session: Civil Infrastructure - ET, UT
Room: J1
Date: 2018-06-12
Time: 16:20 - 16:40

For stainless steel weld joints of water gates of dam infrastructures, the penetrant testing (PT) and the radiographic testing (RT) has been widely conducted during product manufacturing processes. RT is applicable for the flaw detection inside the weld joints, however, it is impossible to locate the films at the opposite side of the weld joints in the case of hard accessibility after welding. Therefore, the needs of the application of the ultrasound testing (UT) to the weld joints during manufacturing processes are increasing because of the accessibility from one side of the weld joints. Austenitic stainless steel has been commonly employed for the water gates for the corrosion resistance, reliable test results might not be thus provided by the conventional UT because of the large attenuation of ultrasounds due to the dendrite in the weld joints. In this paper, authors discuss NDT method using the ultrasonic phased array for austenitic stainless steel weld joints. Prior to on-site application, weld specimens with emulated flaws were prepared. The test results with the specimens in several probes and test conditions were compared and the appropriate test condition was thus found out. On-site application results of the water gates will be presented as well.