Modification of welding stresses by flexural vibration during welding

Flexural vibration was applied to specimens during the welding process to o bserve its effect on welding residual stresses. The study was carried out i n three phases, namely, (i) investigation of the effect of amplitude of vib ration, (ii) investigation of the effect of time of vibration, and (iii) in vestigation of the effect of high frequency vibration. The results of the p resent study provide a basis for relieving the residual stresses in practic e. It has been shown that there is an optimum applied stress that will maxi mise the reduction in both longitudinal and transverse residual stresses. T he effect of time of vibration on residual stresses was found to be negligi ble. after high frequency vibration, the change in longitudinal and transve rse residual stresses showed no consistent trend. STWJ/213 (C) 2001 IoM Com munications Ltd.