| 摘要 |
PURPOSE:To prevent formation of a pinhole in a weld zone and a welding defect in the part welded by an electron beam by welding a nozzle vane and inside and outside partition plates by a weld metal contg. elements having high affinity to oxygen and nitrogen in inert gas then joining the butt surfaces of the inside and outside partition plates and inner and outer rings by electron beam welding. CONSTITUTION:Holes and circumferential grooves are provided in annular inside and outside partition plates 3A, 3B and both ends of a nozzle vane 4 are inserted therein. The holes and circumferential grooves are then subjected to TIG or MIG welding by a weld metal 17 contg. 1 or >=2 elements among Ti, Zr, Ce, and Ca having high affinity to oxygen and nitrogen in an insert gaseous atmosphere, by which the vane 4 is fixed. Formation of a pinhole in the metal 17 is therefore obviated and generation of a welding defect in a weld zone 8 when the plate 3A is welded to an inner ring 1 and the plate 3B to an outer ring 2 respectively by an electron beam is prevented. |
