Welding of Dissimilar Joints of New Power Plant Steels

In conventionally fired power plants, appropriate materials are required which correspond to the different temperature and oxidizing conditions in the boiler and in the superheater sections. Pipe steels with 2 1/4 Cr (P22; T23; T24) must be welded to 9 - 12 % Cr steels (P91; E911; P92; VM12). In this area, the choice of the appropriate welding filler material is vital for the quality of the weldment. This report highlights the possibilities for achieving optimal properties in differing dissimilar metal welds under conditions of reduced carbon diffusion.