The welded joints of dissimilar steel between T92 and S30432 were prepared by TIG welding process using different welding heat inputs in order to investigate the effect of welding heat input on variation of microstructure and mechanical properties of dissimilar welded joint. The results reveal that the welded metal of T92/S34032 dissimilar joint is composed of coarse Ni-based dendritic cellular structure. The heated affect zone(HAZ) in T92 side consists of fine grained HAZ(FGHAZ) and coarse grained HAZ(CGHA...