| 摘要 |
PURPOSE:To reduce greatly defects occurring to a welded part by setting depths of electron beam welded parts on a steam intake side and outlet side when welding a spacer with a nozzle blade to the inner ring and outer ring of a turbine diaphragm. CONSTITUTION:This diaphragm is obtained by welding nozzle blade 7, fitted to spacer 8 into one, to outer ring 5 and inner ring 6 by an electron beam and then by depositing by welded parts 11a and 11b. In this case, respective sizes are set to a/L<=0.5 and b>=0.3c denoting a distance between outer ring 5 on the driving- liquid intake side and nozzle blade 7 by L, the height of nozzle blade 7 by (c), and electron welding beam welded parts of the driving steam intake side and outlet side by (a) and (b), and the determination of depth (a) is fixed depending upon the relation between separately-found depth (a) and the maximum defect occurrence rate. judging from the result of the analysis of a strain value with b/c varied between 0.1 and 0.7, the best b/c is about 0.3. In this way, the best welding depth of a welded part is determined and welding is carried out. |
