蒸汽轮机自带冠靜叶隔板焊接变形

Welding Deformation of Static Diaphragm in Steam Turbine

关键词:  静叶隔板  焊接变形  监测

Key words:  aphragm with coroneted blades  welding deformation  monitor

摘要:

蒸汽轮机自带冠静叶隔板是蒸汽轮机通流部分的静子部件,其制造精度直接影响到整个机组的效率。在实际生产中发现自带冠静叶隔板焊后节圆直径变形大,严重影响了隔板通流尺寸精度。文中针对蒸汽轮机自带冠静叶隔板生产过程中产生的焊接变形问题,采用定点测试方法,进行现场跟踪监测,获得了有效的焊接变形数据。并对自带冠静叶隔板主焊缝焊接后和热处理后的节圆半径变形、直径变形和节圆收缩率进行了深入分析。为了减小焊接变形,在隔板的结构设计方面应控制主焊缝进汽侧与出汽侧的坡口深度比值在1.0~1.15范围内。

Abstract:

The static diaphragm is an important part in steam turbine.And welding deformation in the production of diaphragm is a main problem for the production of steam turbine.In order to minimize the welding deformation of diaphragm,the records of welding deformation are obtained through directly measuring size of the diaphragm with coroneted blades before and after welding.The welding deformation of the diaphragm in radial and circumferential direction is analyzed with the recorded data after the main welds of the diaphragm with coroneted blades are welded and the diaphragm annealed respectively.The design measures for reducing the welding distortion are applied primely.