Evaluation of Mechanical Properties of Dissimilar Metal Welds used in High Pressure Diverter Housing For Offshore Plants
The offshore plant structure is complicated in shape with several parts connected to one equipment. Diverter for offshore plants Also, parts such as pipes, flanges, and plates are connected to the shell and since each part is composed of different materials depending on its function and role, Welding of dissimilar materials is used. By welding these different materials, it is possible to apply suitable materials according to the characteristics required for each part and it is possible to reduce costs. However, the welds are affected by extreme thermal cycling and exhibit completely different properties from the base material, and this change in local characteristics greatly affects the stability of the structure. In case of dissimilar material welding, there is a high possibility that defects are caused by differences in properties (melting point, thermal conductivity, thermal expansion coefficient, etc.) of the two materials. Since diverters for offshore plants must maintain soundness in diverse environments, it is very important to evaluate the mechanical properties of dissimilar metal welds that are structurally weak. Therefore, in this study, tensile test, Charpy impact test and SEM analysis were performed to evaluate the mechanical properties of dissimilar metal welds used in diverter housing for offshore plants.
Index Term- Diverter Housing, Dissimilar Metal Welds, Tensile Test, Charpy Impact Test, SEM