Abstract
The applicability of the ultrasonic technique based on the acoustic birefringence for evaluation of the residual stresses in welded joints of metal structures is demonstrated. A field study of one welded joint of hydroelectric unit rotor frame was performed. Also a laboratory study of a welded plate made from the same material and had the same thickness like chosen welded joint of rotor frame was performed. Ultrasonic measurements by echo method were carried out and acoustic birefringence distributions before and after welding were received. The acoustoelastic coefficients of material were obtained by testing samples cut from the welded plate. The distribution of principal stresses difference in the welded plate in the direction perpendicular to the weld was received by the ultrasonic technique. The results of ultrasonic evaluation of the residual welding stresses in the welded plate We were verified using strain gauges measurements. Due to calibration on the welded plate the residual stresses in the welded joint of the rotor frame were estimated under operating conditions.
Published Version
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