| 摘要 |
PROBLEM TO BE SOLVED: To provide a welded structure of a header and a nozzle stub for improving creep and fatigue damage durability of nozzle stubs without interposing an additional member between the nozzle stub and the header, that is, without increasing the number of components. SOLUTION: In the welded structure of the header and the nozzle stub formed by connecting the plurality of nozzle stubs with bent parts to an outer peripheral wall of the header comprising ferritic steel by welding, the nozzle stub is formed of austenitic stainless steel, and the nozzle stub made of austenitic stainless steel is connected to the header by welding using an Ni group alloy welding material. An annular groove is carved around the nozzle stub welding position on the outer surface of the header outer peripheral wall, and a nozzle stub jointing face is formed inside the groove. An abutment groove is formed by making the nozzle stub and the tip of the nozzle stub jointing face abut on each other so that the nozzle stub and the nozzle stub jointing face are continuously interconnected with approximately the same diameter, and the abutment groove is welded by using the Ni group alloy material. COPYRIGHT: (C)2010,JPO&INPIT
|
