Study on the Welding Performance of SA738Gr.B Steel for the Safety Shell of Nuclear Power Station
JIANG Shanyu
Abstract：The SA738Gr.B steel plate with 42.5 mm thickness for the safety shell of a nuclear power plant is used as the experimental material, the GMAW welding heat input and post weld heat treatment on the microstructure and properties of welded joint were studied. The results show that, with increasing of the welding heat input, low temperature impact toughness of welded joint increased firstly and then decreased;the tensile strength difference is lesser, and the post weld heat treatment has little effect on the mechanical properties of the welding joint. Weld microstructure has fine and homogeneous acicular ferrite, with increasing of input energy lines, acicular ferrite prime number gradually decreased and accompanied by a certain coarsening, massive pro-eutectoid ferrite increased significantly. Welding heat input in the range of 1.2-2 kJ/mm in the range of welding, the better comprehensive mechanical properties can be obtain in welding joint, on this condition post weld stress relief heat treatment has little effect on the properties of welded joints. When using large line energy welding, heat treatment after welding is recommended to reduce the residual tensile stress.
Keywords：SA738Gr.B plateweldingwelded jointmechanical propertymicrostructureresidual stress
Publication Date：2015-09-01
Online Publishing Date：2026-05-22(First online date of this platform, not the publication date of the document)
Pages：4( 42-44,48 )