Research on fluid dynamics during laser deep penetration welding

Abstract

A mathematical model that is capable of simulating the fluid flow and heat transfer during fully penetration laser welding is developed to study: the shape of the keyhole and its stability; velocity vectors and distribution in the weld pool. Firstly, a new combination heat source model consisting of a rotary Gaussian volumetric heat source and a double ellipsoidal volumetric heat source during laser keyhole welding is developed. It represents substantial characteristic of heat transfer of the keyhole. Secondly, A mathematical model for the simulation of heat transfer and fluid flow in weld pool phenomena during deep penetration laser beam welding based on a numerical solution of the conservation equations of energy, momentum and mass is presented. and verification and validation tests were carried out.A mathematical model that is capable of simulating the fluid flow and heat transfer during fully penetration laser welding is developed to study: the shape of the keyhole and its stability; velocity vectors and distribution in the weld pool. Firstly, a new combination heat source model consisting of a rotary Gaussian volumetric heat source and a double ellipsoidal volumetric heat source during laser keyhole welding is developed. It represents substantial characteristic of heat transfer of the keyhole. Secondly, A mathematical model for the simulation of heat transfer and fluid flow in weld pool phenomena during deep penetration laser beam welding based on a numerical solution of the conservation equations of energy, momentum and mass is presented. and verification and validation tests were carried out.