Reduction Method for Residual Stress of Welded Joint Using Two Ultrasonic Vibrations with Different Frequencies

Abstract

A reduction method of tensile residual stress using two ultrasonic vibrations with different frequencies is proposed. Advantage of the method to using one ultrasonic vibration is examined. Obtained results are summarized as follows. 1. Thick plate is buildup welded using ultrasonic vibration is used during welding in experiment. Residual stress of specimen using one ultrasonic vibration is reduced compared with that without ultrasonic vibration. Residual stress of specimen using two ultrasonic vibrations is reduced compared with that using one ultrasonic vibration. 2. Using two-dimensional model, residual stress is calculated by simulation method. Same results as experiment are obtained.