Abstract
The use of low-temperature-transformation (LTT) weld metal is considerably effective in reducing residual stress in welded joints of high-strength steels. The reduction in residual stress is due to the dilatation effect of the martensitic transformation. In this chapter the reduction of residual stress in welded joints of high-strength steels due to LTT weld metal was observed by neutron diffraction analysis. In addition, the relationships between welding conditions and residual stress were examined with FEM simulations for creating the formation mechanism of compressive residual stress. New welding method with LTT weld metal was developed and applied to boxing fillet welded joints. Fatigue measurements of them were carried out to verify the fatigue improvement.
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