ABSTRACT
This chapter examines the parameters of the double-ellipsoid heat source are determined from the isotherms. These isotherms are obtained by solving the analytical equations proposed by Facchinotti, determining the relationship between the geometric features of the weld bead, the peak temperature, and its relationship with the heat source parameters for a Gas Metal Arc Welding process. In numerical simulations of the welding process, the transient temperature distribution in the space is strongly influenced by the size of the double-ellipsoid heat source, defined by J. Goldak’s parameters, which is often obtained by trial and error until get required size. In the thermal model, the arc welding is simulated by a heat source in motion, which generates a transient temperature distribution in the space. To ensure that the thermal analysis in the numerical model is appropriate, the size of the weld pool and the peak temperature at a point during the welding process must be close to the experimental values.
