Abstract—The ultrasonic residual stresses measurement is based on the acousto elastic effect that refers to the change in velocity of the elastic waves when propagating in a stressed media. The experimental method using the longitudinal critically refracted (LCR) waves requires an acousto elastic calibration and an accuracy measurement of the time-of-flight on both stressed and unstressed media. This paper evaluates welding residual stresses in dissimilar pipe-pipe joint of AISI stainless steel 304 and Carbon Steel A106-B type. The residual stresses in inner and outer surface of pipes were evaluated by LCR ultrasonic waves by using 1Mhz, 2Mhz, 4Mhz and 5Mhztransducers. It has been shown that the difference in residual stresses between inner and outer surfaces of pipes and also between Stainless steel and Carbon Steel side can be inspected by LCR waves.
Index Terms—Ultrasonic stress Measurement, acousto elasticeffect, welding residual stress, LCR, dissimilar welded joint.
Yashar Javadi is with Islamic Azad University-Semnan Branch, Semnan,Iran. (e-mail: firstname.lastname@example.org).
Vagelis Plevris is with Department of Civil and Structural Engineering Educators, ASPETE, Athens, Greece..
Mehdi Ahmadi Najafabadi, Associate Professor, is with Department of Mechanical Engineering, Amirkabir University of Technology, Tehran, Iran.
Cite: Yashar Javadi, Vagelis Plevris, and Mehdi Ahmadi Najafabadi, "Using LCR Ultrasonic Method to Evaluate Residual Stressin Dissimilar Welded Pipes," International Journal of Innovation, Management and Technology vol. 4, no. 1, pp. 170-174, 2013.