Abstract:

Based on the principle of conservation of energy and taking into account the influence of heat transfer, a universal theoretical model for heat transfer in EAPJ(Electrically Assisted Pressure Joining) of sheet metal lap joining is established. Taking Grade 1 titanium alloy rolling plate as the research object, according to the actual experimental setup process of EAPJ, simulation and analysis of the electric field, temperature field, and residual stress field during the EAPJ process of titanium alloy plate are completed using Abaqus finite element software. The experimental results show that when the current is applied, the temperature of the workpiece joint rises rapidly to the peak value, and then remains near the peak value until the power is stopped. After 20 s of natural cooling, the joint temperature tends to room temperature, and its residual stress is mainly concentrated near the joint, about 110 MPa. By comparing the experimental and simulation data of the thermal cycle curve at the center point of the EAPJ process joint, it is found that the numerical simulation results are in good agreement with the experimental results, which verifies the accuracy of the numerical simulation method, and provides a theoretical basis for the research of EAPJ mechanism and the actual production process.

Key words: electrically assisted pressure joining, thermodynamic analysis model, electric field, temperature field, residual stress field, titanium alloy, finite element numerical simulation