WELDED STRUCTURE OF MAIN STEAM PIPE AND CASING OF STEAM TURBINE

摘要

PURPOSE:To prevent defects such as weld crack, decarburization and carburization by filling a nickel alloy to a ferritic casting by build-up welding and welding the nickel alloy member by the nickel alloy then welding an austenitic main steam pipe to the other end of the nickel alloy part. CONSTITUTION:The joint weld of the ferritic steel 6 and the Ni alloy member 8 after build-up welding 9 is welded 10 by using a welding rod consisting of the nickel alloy. The other end of the nickel alloy member 8 and the austenitic steel 1 are welded 11 by using the austenitic welding rod after welding of the steel 6 and the member 8.