Shahrood University of Technology Journal of Solid and Fluid Mechanics 2251-9475 8 3 2018 09 23 Evaluation of Ultrasonic Method Capability in Measurement of Longitudinal Welding Residual Stress through Thickness Evaluation of Ultrasonic Method Capability in Measurement of Longitudinal Welding Residual Stress through Thickness 29 47 1337 10.22044/jsfm.2018.6186.2469 FA M. Eftekhari School of mechanical engineering, College of engineering, University of Tehran, Tehran, Iran. M. Ahmadi Faculty of Mechanical Engineering, Amirkabir University M. R. Farahani Associate professor, School of mechanical engineering, College of engineering, University of Tehran, Tehran, Iran. Journal Article 2017 09 05 One of the abilities of Ultrasonic method which has been less investigated, in comparison with other residual stress measurement methods, is the residual stress measurement capability in specimen depths. this capability is due to ultrasonic waves penetration in different depths of specimen, according to their transmittance frequency. In this research, the capability of Ultrasonic method in measurement of longitudinal welding residual stress in specimen depth has been studied. For this goal, four series of Ultrasonic sensors, including 1, 2, 4 and 5 MHz were used in order to reach four depths of pieces of aluminum alloy series 5000 joined by TIG welding. Welding residual stresses were simulated in Abaqus software. Then, simulation model was validated by comparing with the results of X-ray diffraction experimental method. The validated FEM model with x-ray diffraction method was used for validation of residual stress obtained from Ultrasonic method in four depths. Finally, good agreement was observed. Ultrasonic method could measure longitudinal residual stresses with the maximum error of 12% of yield stress of aluminum plate. The accuracy of this method in measurement of the maximum longitudinal residual stress was greater than 92%. One of the abilities of Ultrasonic method which has been less investigated, in comparison with other residual stress measurement methods, is the residual stress measurement capability in specimen depths. this capability is due to ultrasonic waves penetration in different depths of specimen, according to their transmittance frequency. In this research, the capability of Ultrasonic method in measurement of longitudinal welding residual stress in specimen depth has been studied. For this goal, four series of Ultrasonic sensors, including 1, 2, 4 and 5 MHz were used in order to reach four depths of pieces of aluminum alloy series 5000 joined by TIG welding. Welding residual stresses were simulated in Abaqus software. Then, simulation model was validated by comparing with the results of X-ray diffraction experimental method. The validated FEM model with x-ray diffraction method was used for validation of residual stress obtained from Ultrasonic method in four depths. Finally, good agreement was observed. Ultrasonic method could measure longitudinal residual stresses with the maximum error of 12% of yield stress of aluminum plate. The accuracy of this method in measurement of the maximum longitudinal residual stress was greater than 92%. https://jsfm.shahroodut.ac.ir/article_1337_fcfc0b1520302ca3ceb8870a0ed44fe6.pdf