电焊机2025，Vol.55Issue(5)：115-120,6.DOI:10.7512/j.issn.1001-2303.2025.05.16
厚壁15CrMoR钢双丝GMAW焊接工艺研究
Study on the Dual-Welding Process for Thick-Walled 15CrMoR Steel
袁浩 1刘国辉 1银润邦 1景德杨 1李勇1
作者信息
- 1. 东方电气集团东方锅炉股份有限公司,四川 自贡 643001
- 折叠
摘要
Abstract
To address the challenges of welding efficiency and quality control for 60 mm thick 15CrMoR heat-resistant steel plates,a butt welding test was conducted using a twin-wire gas metal arc welding(GMAW)process.The microstructure evo-lution and mechanical properties of the welded joint were systematically characterized.Results indicate that optimized twin-wire GMAW parameters achieved defect-free single-side welding with double-side formation,exhibiting no pores or inclu-sions.Microstructural analysis revealed that the weld zone primarily consisted of bainite with minor acicular ferrite.The heat-affected zone(HAZ)exhibited significant microstructural heterogeneity:the coarse-grained zone(CGHAZ)comprised coarse bainite and granular bainite,while the fine-grained zone(FGHAZ)contained a fine ferrite matrix with granular bainite.The base metal displayed a typical ferrite-pearlite structure.Mechanical tests demonstrated that the joint tensile strength reached 502-504 MPa,with fractures occurring in the base metal,showing ductile fracture characteristics.The room-temperature impact absorption energy of the weld and HAZ ranged from 150-180 J and 223-282 J,respectively,both exceeding standard requirements.Microhardness distribution indicated the highest hardness in the FGHAZ(approximately 220 HV)and the lowest in the base metal(approximately 150 HV),while the weld and CGHAZ exhibited intermediate val-ues.This study confirms that the twin-wire GMAW process,by synergistically controlling heat input and interpass tempera-ture,effectively suppresses brittleness in the CGHAZ,balancing welding efficiency with joint strength and toughness.关键词
15CrMoR/双丝GMAW/显微组织/力学性能Key words
15CrMoR/double wire GMAW/microstructure/mechanical properties分类
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袁浩,刘国辉,银润邦,景德杨,李勇..厚壁15CrMoR钢双丝GMAW焊接工艺研究[J].电焊机,2025,55(5):115-120,6.
