%0 Journal Article
%T A Two-Dimensional Thermomechanical Analysis of Burn-Through at In-Service Welding of Pressurized Canals
%A Farid Vakili-Tahami
%A Hamed Masumi-Asl
%J Journal of Applied Sciences
%D 2009
%I Asian Network for Scientific Information
%X In this study a numerical model has been developed to predict the onset of the failure of a rectangular canal-wall during an in-service welding process. In-service welding is one of the many applications of welding methods which has a wide use in petrochemical and gas industries. The safety of the in-service welding is a major concern and the investigation of the Burn-Through and Hot-Cracking risks is becoming an important issue. In this research a Finite Element based numerical method has been used to model the in-service welding of an AISI 304 stainless steel plate on a rectangular canal-wall. A coupled 2D thermo-elasto-plastic FE model has been developed in which the temperature dependency of the physical properties of the material has been taken into account. Also, the effect of different factors such as: pressure of the fluid passing through the canal, different types of supports and geometry of the weld beads to reduce the risk of the burn-through have been studied. In addition, temperature-time diagrams have been produced which can be used to study the possibility of hot-cracking. The results show that the burn-through occurs under the welding pool and it is more likely to happen in the first welding-pass. These results show that the thermal condition of the fluid passing the canal, the external loadings such as internal pressure and supports have significant effect on the thermal stresses which may cause burn through.
%K FEM
%K burn-through
%K In-service welding
%K Thermo-elasto-plastic analysis
%K canal wall
%U http://docsdrive.com/pdfs/ansinet/jas/2009/615-626.pdf