Numerical and Experimental Investigation of Pulsed Laser Welding of Hastelloy C-276 Alloy Sheets

Abstract

In this paper, a three-dimensional finite element model is developed to compute thermal phenomena of 0.5 mm thick Hastelloy C-276 alloy sheets during pulsed laser beam welding (PLBW). Temperature-dependent thermal properties of Hastelloy C-276 alloy, effect of latent heat of fusion, and the convective and radiative boundary conditions are taken into account in the model. The space-time temperature distributions in a butt-joint weld produced by the PLBW process are predicted from the beginning of welding to the final cooling. The heat input to the model is assumed to be a double ellipsoid heat source. The finite element calculations are performed by using ANSYS code with the parametric design capabilities. Experiments were carried out to determine the temperature evolution during welding and to measure the cross section profile of the weld bead. By comparing the simulation results with the corresponding experimental findings, it is found that they are in a good agreement. The validity and applicability of the numerical simulation model are confirmed.

Effects of heat input on welding buckling distortion by experimental measurement method

“…Thus, many research studies have predicted the various factors that cause welding distortion based on a numerical simulation method. In contrast, experimental methods, such as vernier caliper [12], height gauge [13], dial-gauges [14, 15], three-coordinate measuring systems [16], laser displacement sensor [17] and photogrammetry [18] are used to verify only the FE model based on the examination of a limited number of points or the final distortion. Owing to the welding conditions of high temperature and bright light, the current distortion studies are very scarce in terms of data acquisition and dynamic tracking of a dense area of points.…”

The deformation analysis of friction stir welding with different clamping distances for large thin-walled joints

“…As a complex thermodynamic coupling process, many thermo-mechanical models have been developed to predict the deformation of welding. Guo et al [8] proposed a three-dimensional (3D) thermo-mechanical coupling model to explore the distribution of the deformation for pulsed laser welding of Hastelloy C-276 thin-walled sheets. Khandkar et al [9] constructed a sequentially coupled finite element model of FSW process and the residual stresses caused by the thermal cycles were studied.…”

Laser gas assisted nitriding of Hastelloy G Alloy: thermal stress analysis and characterization

“…The presence of different nitride phases was indicated and that they were a function of laser parameters and processing atmosphere. Laser heating pertinent to the welding process was modeled by Guo et al . using the finite element method.…”