Abstract:
Finite element model of Mg/Ti dissimilar metal joint welded by cold metal transfer method was established by ABAQUS finite element software, and stress field of joints during welding process was simulated. The variation regularity of simulated stress field with different welding parameters and constraints was studied and compared with test results to further confirm the accuracy of the simulation results. The results show that the transverse and longitudinal stress at the weld seam were changed from compression stress to tensile stress during the welding process. After the welding joint was completely cooled, the maximum transverse residual tensile stress reached 88 MPa at the magnesium sheet and 192 MPa at the titanium sheet. After the welding joint was completely cooled, the peak value of the longitudinal residual tensile stress at both sides all reached about 220 MPa. The residual longitudinal compression stress at titanium side was more than that of the other side, which had a maximum of 265 MPa. The residual stress results by finite element simulation with coupled constrained boundary condition were close to that of the test results.