摘要
门框和塔筒是风电机组最重要的刚性支撑部件,其中门框与塔筒角接接头为应力集中处。焊接生产质量要求高,出厂前已严格进行无损检测,但仍发现部分服役几年后的风电机组门框与塔筒焊接接头有超标缺陷,严重影响风电机组安全稳定运行,必须及时快速地完成现场修复。综合考虑现场不具备焊后热处理的条件,进行了低合金钢Q345E的熔化极气体保护焊且增焊回火焊道的工艺试验,并对焊接接头进行了外观检查、拉伸试验、弯曲试验、冲击试验、宏观金相检验及硬度检测。结果表明:采用熔化极气体保护焊以及增焊回火焊道工艺,适合门框与塔筒焊接接头的现场修复,接头无任何缺欠,力学性能好,-40℃低温韧性与显微硬度性能好,修复效率高。
The door frame and tower are the most important rigid support components of the wind turbine,and the door frame and the tower angle joint are the stress concentration position.The welding production quality requirements are high,and nondestructive testing is strictly carried out before leaving the factory,but it is still found that some of the wind turbine door frame and tower welding joints that have been in service for several years have excessive defects,which seriously affects the safe and stable operation of the wind turbine,and the on-site repair must be completed in time and rapidly.Comprehensively considering that the site does not have the conditions for post-weld heat treatment,the process test of gas metal arc welding(MAG)and tempering welding beads of low-alloy steel Q345E was carried out,and the visual inspection,tensile test,bending test,impact test,macroscopic metallographic inspection and hardness test of the welded joint were carried out.The results show that the MAG welding and adding tempering weld beads is suitable for the on-site repair of the door frame and the tower welding joint,the joint has no defects,and the mechanical properties of the joint are good,the-40℃low temperature toughness and microhardness are good,and the repair efficiency is high.
作者
陈超凡
张永辉
刘洪冰
王金生
CHEN Chaofan;ZHANG Yonghui;LIU Hongbing;WANG Jinsheng(Dasheng Tsing Wind(Beijing)Technology Co.,Ltd.,Beijing 100036,China;Luoyang Advanced Manufacturing Industry Center Tianjin Research Institute for Advanced Equipment,Tsinghua University,Luoyang 471003,China)
出处
《热加工工艺》
北大核心
2025年第21期59-62,69,共5页
Hot Working Technology
基金
中央引导地方科技发展专项项目(20200634017)。
关键词
熔化极气体保护焊
低温韧性
显微硬度
回火焊道
gas metal arc welding
low temperature toughness
microhardness
tempering weld beads
