비접촉 SH-EMAT을 이용한 TIG용접부 건전성 평가

• Published in: 한국생산제조시스템학회지 Vol. 25; no. 1; pp. 48 - 53
• Main Authors: 박태성, 박영환, 박익근, Park, Tae Sung, Park, Yeong Hwan, Park, Ik Keun
• Format: Journal Article
• Language: Korean
• Published: 2016
• Subjects: Non-Contact; Radiographic Testing; TIG Welding; Phased Array-UT; SH-EMAT; Integrity
• ISSN: 2233-6036; 2383-4846

An EMAT can be used to reliably detect defects as it serves as a non-contact transducer with the ability to transmit ultrasonic waves into specimens without couplant. Moreover, an EMAT can easily generate desired waves by altering the design of the coil and magnet. This study proposes an SH-EMAT to evaluate the integrity of the TIG welding part. A stainless steel was welded using the TIG welding method. The welding current was varied to create artificial defects. Both the PA-UT and the RT were applied to verify the defect size. The experimental results generated by using the EMAT were compared with those methods. The amplitude was observed to decrease with an increase in the defect size. These results confirmed that the presence of defects can be reliably detected by attenuation of signal amplitude. The results demonstrated that the proposed method is suitable for evaluating the integrity of TIG welding.