超超临界机组低温再热器导向管夹焊缝泄漏分析Leakage Analysis on Low-temperature Reheater Guide Clamp Weld of Ultra-Supercritical Unit
赵炜炜,彭以超,闫飞,楼玉民,许好好,王贤明
ZHAO Weiwei,PENG Yichao,YAN Fei,LOU Yumin,XU Haohao,WANG Xianming
摘要(Abstract)：
某1 000 MW超超临界机组投运4年内,低温再热器12Cr1MoV材质段水平管组导向管夹焊缝多次发生泄漏。取泄漏和未泄漏管样进行宏观、金相、显微硬度、断口扫描等检验,结果发现:低温再热器导向管夹连续多次泄漏,主要是由于施焊环境温度过低、焊条尺寸选用不当、焊接电流偏大导致在角焊缝内侧熔合线区域形成焊接裂纹。原始焊接裂纹在应力作用下疲劳扩展,导致最终泄漏。
Leakage failure occurred frequently in the guide tube-clamp weld of low-temperature reheater in a4-year 1000 MW USC unit. Leaked and unleaked tube samples were taken for macroscopic, metallographic,microhardness, fracture scanning and other tests. It was found that the main reason for the continuous multiple leaks was that the welding problem is caused by low welding temperature, improperly selected electrode size and large welding current, resulting in the formation of welding cracks in the fusion line area inside the fillet weld. The original welding crack expanded under stress, resulting in a final leak.
关键词(KeyWords)：
12Cr1MoV;0Cr18Ni9;焊缝裂纹;低温再热器;导向管夹
12Cr1MoV;0Cr18Ni9;welding crack;low temperature reheater;guide clamp
基金项目(Foundation):
作者(Author):
赵炜炜,彭以超,闫飞,楼玉民,许好好,王贤明
ZHAO Weiwei,PENG Yichao,YAN Fei,LOU Yumin,XU Haohao,WANG Xianming
DOI: 10.19585/j.zjdl.201904019
参考文献(References)：
- [1]张敏,徐蔼彦,汪强,等.高温运行后12Cr1MoV钢焊接接头的显微组织和力学性能[J].机械工程材料,2016,40(2):98-101.
- [2]赵建仓,姚建华,成鹏,等.超超临界锅炉12Cr1MoVG集箱角接头再焊缝裂纹原因分析及焊接工艺优化[J].发电设备,2011,25(4):274-277.
- [3]刘倩倩,句光宇,王志武.12Cr1MoVG钢再热器管焊接接头断裂原因分析[J].金属热处理,2015,40(12):181-184.
- [4]张苏闽,汤淳坡,王平,等.12Cr1MoV钢水冷壁焊接裂纹分析及对策[J].金属热处理,2016,41(6):180-184.
- [5]王香云.12Cr1MoVG钢焊接接头焊缝裂纹原因分析及对策[J].焊管,2010,33(4):13-17.
- [6]李亚琳,尹士科,何长红.低合金钢焊接裂纹简述[J].机械制造文摘(焊接分册),2013,27(6):8-13.
- [7]吕少军,李爽,孟会敏.低温工况下的0Cr18Ni9不锈钢管道的焊接[J].现代焊接,2007,8(9):39-41.
- [8]陈忠兵,赵彦芬,赵建仓,等.厚壁12Cr1MoVG钢焊接接头裂纹分析及其控制[J].中国电机工程学报,2012,32(35):137-143.
- [9]张宗来.电站锅炉12Cr1MoVG/TP347H异种钢接头断裂分析[J].热力发电,2017,46(5):132-136.
- [10]吴奭登,高岩,盘荣旋,等.再热器管导种钢焊缝断裂原因分析[J].热力发电,2011,40(2):91-93.
- [11]王伟,王学,钟万里,等.屏式过热器T23/12Cr1MoV异种钢接头失效分析[J].电力信息与通信技术,2013,46(10):9-12.
- [12]赖新华.TP304H与12Cr1MoV锅炉管异种钢的焊接[J].焊管,2002,25(2):12-15.
- [13]陈忠兵,吕一仕,侯志强,等.P92钢焊条电弧焊焊缝金属焊缝裂纹及其特征[J].焊接,2013,57(12):33-39.
- [14]韩建伟,王守革.锅炉和压力容器焊接质量的控制与管理[J].焊接,2004,48(4):14-17.
- [15]韩利东.厚壁12Cr1MoVG管道在低温环境下的焊接[J].电焊机,2008,38(2):69-70.
- [16]火力发电厂异种钢焊接技术规程:DL/T 752-2010[S].北京:中国电力出版社,2010.