Abstract: The technology of trailing peening is a kind of promisingly bran-new technology which can be used to control welding stress and distortion of Ti alloy thin plate. Control of TC4 Ti alloy thin plate welding stress and distortion under the condition of conventional welding and trailing peening is performed, respectively. The results show that the technology of trailing peening effectively reduces deflection and transverse shrinkage of thin plate weldment. The maximum deflection is decreased from 15 mm under the condition of conventional welding to 5 mm, while the weld transverse shrinkage is decreased from 0.5 mm to about 0.1 mm.

Key words: Control of residual stress and distortion, Trailing peening, TC4 Ti alloy