电焊机2026，Vol.56Issue(2)：56-62,7.DOI:10.7512/j.issn.1001-2303.2026.02.06
超超临界锅炉水冷壁MIG堆焊修复工艺研究
Research on MIG Cladding Repair Technology for Water-cooled Walls in Ultra-supercritical Boilers
张焱 1石天琪 1王强 1刘洋 2赵义瀚 2姜英龙 2徐玉君 2王唯一2
作者信息
- 1. 陕西榆林能源集团横山煤电有限公司,陕西 榆林 719000
- 2. 中国机械总院集团哈尔滨焊接研究所有限公司,黑龙江 哈尔滨 150028
- 折叠
摘要
Abstract
To address the thinning failure of water wall tubes in coal-fired power plant boilers,this study proposes a repair method using MIG vertical-down overlay welding with ERNiCrMo-3 filler wire.The influence of welding parameters was systematically investigated to optimize the process.The welding stability was verified through visual inspection(VT),radio-graphic testing(RT),mechanical testing,and metallographic analysis.Key findings include:The corrosion depth was mea-sured at approximately 450μm.The similar thermal expansion coefficients between the filler wire and base metal(15CrMoG)prevented interfacial delamination.Both VT and RT results met Class I acceptance criteria.The shear strength reached 491 MPa,exceeding the standard value(440 MPa)of 15CrMoG base material.No cracks were observed in side bend tests.Micro-structural characterization revealed:Weld zone:γ solid solution with precipitated phases.Overheated zone:Bainite.Normal-ized zone:Bainite with minor pearlite.Partially normalized zone:Ferrite,bainite,and pearlite.A slight hardness peak in the coarse-grained zone was attributed to bainite formation.This study provides technical support for overlay welding repair of water wall tubes and offers a new approach for practical maintenance applications.关键词
MIG立向下/堆焊/ERNiCrMo-3/焊接工艺Key words
MIG downward/surfacing/ERNiCrMo-3/welding process translation分类
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张焱,石天琪,王强,刘洋,赵义瀚,姜英龙,徐玉君,王唯一..超超临界锅炉水冷壁MIG堆焊修复工艺研究[J].电焊机,2026,56(2):56-62,7.
