A Study of the Possibility of Reducing Residual Stresses and Strains in Welded Joints by Ultrasonic Treatment

This work explores the possibility of using ultrasonic vibrations as a method for eliminating residual and intrinsic stresses, as well as improving the quality of welded joints. Based on the experiments carried out on three steel grades of various classes, it was found that ultrasonic treatment of welds contributed to the elimination of such defects as deformations, intrinsic and residual stresses, as well as increasing fatigue strength and certain mechanical properties of welded joints. An analysis of existing methods of removing residual and intrinsic stresses was conducted. It was shown that the treatment of the welded joint zone by ultrasound reduced the degree of deformation over time by more than two times. A method for determining stresses in welded joints was developed. Ultrasonic processing modes were optimized to determine the energy and power in the welded zone. The shape and the material of the waveguide tool with a spherical percussion mechanism were selected.

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