Finite Element Analysis of Transient Welding Stress and Strain during Ti-6Al-4V Thin Plate Welding with Impact Rotation

Abstract

The internal thermal transient stress and strain is difficult to be real time measured by experimental methods during welding, but the stress and strain is vital to understand the mechanism of the control on the wave-like deformation. Large nonlinear finite element software of MSC.Mrac is used to illustrate decrease of the wave-like deformation of the Ti-6Al-4V thin plate weldment by a new technique called welding with impacting rotation. Some simulation results such as temperature field, thermal transient stress evolution, elastic strain, plastic strain and distortion of thin plate are shown. By the help of the finite element analysis, the mechanism of control on the wave-like deformation was put forward, i.e. the residual stress was decreased by the certain amount plastic extensive deformation generated by the impacting revolution. Keywords: finite element analysis (FEA), Ti-6Al-4V, thin plate weldment, wave-like deformation, residual stress