| 摘要 |
<p>PURPOSE:To develop repeated bending stress within a fatigue endurance limit in a build up welding part and to reduce residual stress in the welding part by applying the repeated load to a rotor in the case of buildup-welding low alloy steel to journal parts of the rotor composed of 12 Cr steel. CONSTITUTION:A loader 7 is set to end part at reverse side of the buildup welding part 5 so that the largest bending stress develops to the buildup welding part 5 in the 12 Cr rotor 1. A bearing 6 is fitted to a coupling part 4 of the rotor 1 and a low velocity rotating device 8 is fitted to the coupling part 4 of one side. Then the rotor 1 with the coupling 4 supported with the bearing 6 under rotation is rotated at a low velocity with the device 8, and the load is given to the free end of rotor 1 with the loader 7 to develop the bending stress to the buildup welding part 5 side at the fixed end of the rotor. At the time of rotating the rotor 11 at one turn while applying the fixed load with the loader 7, the buildup welding part 5 receives a stress cycle of tension 0 coompression 0 tension to reduce the residual stress.</p> |
