Mechanical behavior of high strength S690-QT steel welded sections with various heat input energy

摘要

Over the past two decades, there were a number of experimental investigations into mechanical properties as well as structural behaviour of high strength S690-QT steel welded sections. It is evident now that, similar to structural aluminium, these welded sections will suffer from a significant reduction in their mechanical properties, i.e. both yield and tensile strengths as well as ductility, due to change in microstructures if welding is not properly controlled. Owing to a lack of detailed understanding on effects of various welding procedures and parameters onto the mechanical properties of these steel welded sections, many design and construction engineers have serious concerns on adopting these S690-QT steel materials in buildings and bridges.