电焊机2025，Vol.55Issue(12)：39-44,6.DOI:10.7512/j.issn.1001-2303.2025.12.06
过热器管道CMT立向下自动堆焊修复工艺研究
Study on the CMT Downward Automatic Surfacing Repair Process for Overheater Pipelines
ZHANG Yan 1GAO Lixiao 1BAI Aiping 1LIU Yang 2WANG Qiang 1GUO Xiao 2SUN Hongwei 2FU Wenjun2
作者信息
- 1. Shaanxi Yulin Energy Group Hengshan Coal and Electricity Co.,Ltd.,Yulin 719000,China
- 2. Harbin Welding Institute Limited Company,Harbin 150028,China
- 折叠
摘要
Abstract
To address the thinning and cracking failure issues caused by high-temperature corrosion and particle erosion in 12Cr1MoV steel superheater tubes of ultra-supercritical coal-fired power units burning high-sulfur coal,a repair method us-ing CMT downward vertical surfacing with ERNiCrMo-3 nickel-based welding wire was proposed.The effects of wire feed-ing speed(7-11 mm/min),oscillation forward distance per cycle(1-5 mm),weaving width(5-9 mm),and welding speed(200-400 mm/min)on weld bead formation(weld width,reinforcement height,contact angle)were investigated.Microstruc-ture and mechanical properties of the surfacing joints were systematically analyzed.Results indicated that wire feeding speed(current,voltage)and welding speed had relatively significant influences on weld bead geometry.The oscillation for-ward distance and weaving width optimized weld overlapping quality through contact angle adjustment,while reinforcement height could be controlled by oscillation forward distance.Under optimal process parameters(wire feeding speed:10 mm/min;welding speed:300 mm/min;weaving width:7 mm;oscillation forward distance:3 mm),the surfacing layer thickness reached 2-3 mm without defects like cracks or porosity,achieving metallurgical bonding with the base metal.Mechanical testing showed the surfacing layer exhibited an average hardness of 233.4 HV,higher than the base metal's 157 HV.The shear strength at the fusion interface reached 545 MPa,exceeding the required standard for base metal(490 MPa).Micro-structural analysis revealed γ solid solution+precipitates in the weld zone,bainite in the overheated zone,bainite+minor pearlite in the normalized zone with significantly spheroidized pearlite,ferrite+bainite+pearlite in the incompletely nor-malized zone,and ferrite+pearlite in the base metal.This study provides reference for efficient and high-quality repair of 12Cr1MoV superheater tubes.关键词
CMT立向下/堆焊/ERNiCrMo-3/12Cr1MoV/焊接工艺Key words
CMT Downward position/surfacing welding/ERNiCrMo-3/12Cr1MoV/welding procedure分类
矿业与冶金引用本文复制引用
ZHANG Yan,GAO Lixiao,BAI Aiping,LIU Yang,WANG Qiang,GUO Xiao,SUN Hongwei,FU Wenjun..过热器管道CMT立向下自动堆焊修复工艺研究[J].电焊机,2025,55(12):39-44,6.
