Calculation of energy lost by radiation and convection during laser welding of TA6V titanium alloy

Abstract

Laser welding is being used more frequently in industrial processes because of its advantages; therefore, energy loss in welding is an important issue during planning and operation. We calculated the energy losses expected during the laser welding of TA6V titanium alloy. We used the heat equation to describe the energy distribution of solid and liquid TA6V. The solid-to-liquid phase change was taken into account by comparing the accumulated energies and enthalpy of fusion. A numerical model was used to calculate the energy lost by convection and radiation. Finite difference calculations were performed using a FORTRAN-based computer program to solve the heat equation. The numerical results suggested that the appropriate laser welding velocity and power were in good agreement with the experimental data published elsewhere in the literature. The results showed the importance of the influence of the energy lost by radiation and convection in the welding area on welding energies and temperatures.

Support optimization in additive manufacturing for geometric and thermo-mechanical constraints

“…For the numerical calculations, mechanical and thermal parameters have been taken from [31]. The titanium alloy TA6V, commonly used in additive manufacturing, is considered and its properties are set in Table 3.2.1.…”

Simulating Convective-Radiative Heat Sinks Effect by means of FEA-based Gaussian Heat Sources and Its Approximate Analytical Solutions for Semi-Infinite Body

“…The FEA method requires calibration of the heat source parameters to get a solution with acceptable accuracy for predicting the transient temperature field in the heated products and melted pool geometry. The authors included the effect of convection and radiation into their transient temperature field modelling via FE boundary conditions as these effects are deem significant [23][24]. Usually, the FEA boundary conditions, imposed on the external surfaces of the spatial domain, using FEA packages such as ANSYS [14][15][16][17][18][25][26][27] or ABAQUS [28,29].…”

“…Lemkeddem et al [24] developed a numerical model to determine transient temperature distribution for the laser welding of two identical TA6V thin plates, taking account the energy lost by radiation and convection. They concluded that it is necessary to include energy losses in the welding area to improve laser welding efficiency.…”

“…Numerical techniques such as the finite element (FE) method are commonly used, particularly for simulating of heating process in complex geometries, to obtain transient temperature field for various heat sources [10,[12][13][14][15][16][17][18][19][20][21][22][23][24][25][26][27][28][29]. The FEA method requires calibration of the heat source parameters to get a solution with acceptable accuracy for predicting the transient temperature field in the heated products and melted pool geometry.…”