Three-dimensional finite element simulation of gas tungsten arc welding for β-titanium alloy

Abstract

In the current study, three-dimensional simulation of an autogenous gas tungsten arc welding of β-titanium alloy (Ti-15V-3Cr-3Sn-3Al) was attempted using the finite element method. Models were developed for continuous current and pulsed current welding at different frequencies (2, 4 and 6 Hz). The transient temperature distributions along the heat-affected zone of the simulated weldments were predicted by considering a moving heat source, the surface heat flux distribution and convectional heat loss in the welded plates. Comparative studies of cooling rates and peak temperatures of the simulated welds between all the generated models were conducted. A realistic temperature at the weld center was also predicted. Results show that both peak temperature and cooling rate exhibit increments with pulsing and also with the increase in frequency up to 4 Hz. Obtained results validated against experimental data showed good agreement.