水轮机叶片焊缝及其热影响区裂纹分析

Crack Analysis of Weld Metals and Its Heat Affeet Zones in Hydraulic Turbine Blades

水轮机叶片上的焊缝及其热影响区常发现有穿透性的裂纹,微观分析结果表明焊缝中存在夹杂物,在焊接残余应力、工作应力、机械震动应力和电化学腐蚀的共同作用下,造成水轮机叶片的焊缝及其热影响区形成穿透性的腐蚀疲劳裂纹。

The Penetration cracks in weld metals and its heat affect zones of hydraulic turbine blades often were found. The microanalysis results show that the inclusions in weld metals, welding residual stress, working stress,mechanical vibrating stress and electrochemical corrosion of metal caused the penetration corrosion fatigue cracks in weld metals and its heat affect zones of hydraulic turbine blades.