汽轮机低压缸隔板裂纹的补焊修复措施  

Repair welding measures of cracks on diaphragm of steam turbine low-pressure cylinder

作　　者：杨占君[1] 王丽朋 

机构地区：[1]甘肃电力科学研究院,甘肃兰州730050 [2]兰州西固热电有限责任公司,甘肃兰州730060

出　　处：《华电技术》2012年第1期41-42,46,共3页HUADIAN TECHNOLOGY

摘　　要：某电厂#2汽轮机在大修时发现,低压缸第6级隔板存在1条长约35 mm的表面裂纹,直接影响了机组的安全运行。对隔板材料进行综合分析后,决定采用冷焊法对该缺陷进行挖磨和补焊。介绍了补焊工艺、准备工作、防范措施及检验手段。隔板补焊后经过一个大修周期的运行,补焊部位未出现新的缺陷,证明采用该补焊工艺完全能够保证补焊后的隔板安全运行。During overhaul of steam turbine No.2 of a power plant,it was found that there is an about 35 mm surface crack in sixth stage diaphragm of the low-pressure cylinder,which influences on unit safe operation directly.According to comprehensive analysis of the material of the diaphragm,it was decided to repair the defect by dig grinding and patch weld,and to adopt the cold welding method for the patch weld.The patch weld process,the preparing work,the preventive measures and the inspect method were introduced.The repaired diaphragm had operated for an overhaul period,and there was not new defect occurred in the patch welded position.This shows that the patch weld technology can ensure safe operation of the repaired diaphragm completely.

关 键 词：汽轮机 隔板 裂纹 灰口铸铁 冷补焊 安全运行 

分 类 号：TK263.2[动力工程及工程热物理—动力机械及工程]