电焊机2024，Vol.54Issue(7)：132-137,6.DOI:10.7512/j.issn.1001-2303.2024.07.19
通流改造机组高压主汽联合阀焊缝开裂分析及处理建议
Cracking Analysis and Repair of High-Pressure Main Steam Combined Valve Welds in Through-Flow Transformation Units
张金生 1王庆峰 2刘彦如 2许亮 1安志彤 1马志宝 2陈鑫 2杜双明2
作者信息
- 1. 河北大唐国际王滩发电有限责任公司,河北 唐山 063000
- 2. 中国大唐集团科学技术研究总院有限公司 华北电力试验研究院,北京 100040
- 折叠
摘要
Abstract
This paper conducts an in-depth analysis of the transverse crack issues in the R337 butt weld of the high-pressure main steam valve and high-pressure regulating valve after the through-flow transformation of a certain unit.By observing on-site cracks,analyzing samples,and evaluating material performance,the main causes of crack formation were deter-mined.Firstly,the improper selection of the R337 welding material led to an increase in the brittleness of the weld.Sec-ondly,the superimposed effects of structural stress and alternating stress accelerated the expansion of the cracks;the high carbon equivalent of ZG15Cr1Mo1V steel makes it prone to cold cracking,and the addition of Nb elements increases the sensitivity to reheat cracking.Based on the causes of crack formation,treatment suggestions were put forward,which in-clude the thorough removal of the original R337 weld and the repair with a lower-matched R317 welding rod;during the welding process,strict control of preheating temperature,interlayer temperature,and welding line energy is required to re-duce welding stress;post-weld heat treatment by induction heating is carried out to evenly distribute the temperature field and fully relieve stress;considering the reheat cracking tendency of ZG15Cr1Mo1V steel,appropriate preventive measures are recommended during the repair process.This study not only provides technical basis for the repair of high-pressure main steam valve welds but also offers references for similar material and structural welding repair work.关键词
ZG15Cr1Mo1V/横向裂纹/失效分析/焊接修复Key words
ZG15Cr1Mo1V/transverse cracking/failure analysis/welding repair分类
矿业与冶金引用本文复制引用
张金生,王庆峰,刘彦如,许亮,安志彤,马志宝,陈鑫,杜双明..通流改造机组高压主汽联合阀焊缝开裂分析及处理建议[J].电焊机,2024,54(7):132-137,6.
