Numerical and Experimental Investigation of Pulsed Laser Welding with Trailing Heat Sink of Hastelloy C-276 Alloy Sheets

摘要

To reveal the thermal-mechanical behaviors during the pulsed laser welding (PLW) with trailing heat sink in a Hastelloy C-276 butt-welded joint, a three-dimensional finite element model (FEM) was established by using the ANSYS code. Experiments were carried out to measure the welding temperature histories and residual distortions. The simulation results agree well with the corresponding experimental measurements. Based on the validated FEM, the effect of the cooling distance on welding residual stresses and distortions was investigated. According to the numerical simulations, the cooling distance has a great influence on the magnitude and the distribution of residual stresses and distortions are changed significantly in comparison to the conventional PLW. The peak values of the longitudinal residual compressive stresses and the maximum deflections in longitudinal direction decrease as the cooling distance decreases from 12 to 3 mm. The magnitudes of the transverse shrinkage distortions increase as the cooling distance decreases from 12 to 3 mm. The proper cooling distance to reduce the residual stresses and distortions of the PLW with trailing heat sink is detected at 6 mm.