大型水轮机分瓣转轮焊接应力测量

Welding Stress Measuring for Large Two-part Turbine Runner

大型水轮机分瓣转轮焊接应力是转轮产生变形的重要因素之一 ,提出了用X射线测量大型水轮机分瓣转轮焊接应力的新方法 ,给出了二滩水电站用该方法测量的结果 ,并指出大型水轮机分瓣转轮结构设计时必须考虑上冠和下环的联接方式 ,采用卡栓联接的分瓣转轮易于产生较大的残余焊接应力 ,卡栓联结工艺不利于转轮整体退火工艺的采用 。

Welding stress is one of the reasons of turbine runner deformation. Proposed a new method of measuring welding stress by X ray for large two part turbine runner. It can be used for identifying the manufacturing and installation quality. The result of Ertan project is given and it demonstrated that connection joint in crown and lower ring should be considered carefully. The craft of shrink bolt may creat some large residual stress and annealing can only relieve a part of it. It should be studied more deeply for this craft come into practice.