NUMERICAL ESTIMATION OF METALLURGICAL PHASES IN LOW CARBON STEEL WELDS

Abstract

Welding technology is a rapidly changing field, it is a permanent joining process which produces a sound joint between the two different materials, alloys, like metals, or plastics together, by the application of heat or pressure or heat and pressure both. Welding involves rapid heating as well as fast cooling, whole operation finishes with in fraction of time, and hence it produces distortion, which leads towards the dimensional inaccuracy. To predict the residual stress by performing the actual welding experiments is a complex and time consuming process. It also needs an expertise to perform the residual stress measurement operation, because it is a complex process. The reliable prediction of residual stress and distortion needs the consideration of volumetric changes associated with metallurgical phase evolution during the welding operation. HY85 steel has a place with HSLA (known as High strength low alloy ) steel category, these steels are a combination of impact toughness, strength, and ductility at room as well as subzero temperature range. Fusion welding is preferred method of joining for HY 85 steels in the ships manufacturing industries. this is a high strength steel utilized to fabricate big designing structure, like maritime ship, pipeline oil tank etc. it is important to understand the weld behavior of this type of steel for future fabrication purpose.