MONITOR METHOD FOR DAMAGE TO WELDED JOINT OF STAY RING AND STAY VANE OF HYDRAULIC MACHINE

摘要

PURPOSE:To continuously monitor the presence of damage of welded joint without stopping running, by providing the space at the welded joint of stay ring and stay vane of water wheel and detecting the change in gas state at the space. CONSTITUTION:The stay ring 2 and the stay vane 3 of the water turbine are welded and jointed so that the unwelded part 9 sealed with the welded joints 8... isolated from external can be formed at the center to minimize the wasted molten metal in response to the distribution of tensile stress produced at running. Drill holes are made leading to the unwelded part 9 with the vane 3 and the ring 2 has the detection hole 12, through which the pressure and moisture inspection sensor 13 is connected to detect the gas condition in the unwelded part 9 dut to water leakage by the damage of the welded parts 8... to the space formed with the unwelded part 9. Thus, without interrupting running, the presence of the damage production of the welded joints can continuously be monitored.