Abstract
A fine-grained steel has the same components and weldability as a mild steel, whereas a conventional high-strength steel has lower weldability due to its alloying elements. The occurrence of softening caused by coarsening in the heat-affected zone (HAZ) of welded parts of the fine-grained steels and mechanical design of welded parts including weld HAZ-softening becomes much important. Mechanical properties of the HAZ-softening joint are examined by considering the characteristics of the tensile strength under the theory of the strength of undermatched joints. The effects of the mechanical and geometrical heterogeneity on tensile strength of the HAZ-softened joint are studied by using the large-deformation finite-element analysis. The design of the HAZ-softened joint is possible considering welding conditions and tensile strength of the joint that mostly overreach the strength of the base metal. The deformation behaviour and the fracture characteristics in HAZ-softened joints under the consideration of the actual use are furthermore investigated.
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