| The purpose of this research is to examine how post-welding behavior is influenced by the selection of initial materials and welding processes. In order to compare the welding results, two different materials -- AISI 304 and AISI 420 stainless steels -- are selected, and the welding processes are performed computationally using a finite element code SYSWELD with Goldak's numerical arc welding heat input modeling. The stainless steels are subject to phase transformation while the heated weld cools down, and it is shown that the phase transformation has a great effect on the welding behavior. This research is based on 3D analyses using relatively slow welding speeds. The welding results are classified into two categories -- welding deformations and residual stresses. To develop the research, a fin-to-tube, a welded assembly used in boiler applications, is employed to compare lateral and longitudinal deformations. The distribution of stresses and the nature of the welding distortion are described in detail. |
