电焊机2026，Vol.56Issue(9)：93-104,12.DOI:10.7512/j.issn.1001-2303.2026.09.10
薄板高强钢激光-电弧复合焊非金属夹杂物及金相分析组织性能研究
Study on Non-Metallic Inclusions and Metallographic Analysis of Thin High-Strength Steel with Laser-Arc Hybrid Welding
摘要
Abstract
This study systematically characterizes non-metallic inclusions in different zones of 4-6 mm thin-plate laser-arc hybrid welded joints of a certain high-strength steel,EH36,and CCSB marine steels using metallographic methods and scan-ning electron microscopy(SEM/EDS).The microstructural evolution in the weld metal,fusion line,and heat-affected zone is comparatively analyzed,and its correlation with mechanical properties is established.The results show that the inclusions are predominantly type D spherical oxides,with sizes concentrated in the range of 1-15 μm;the metallographic and SEM re-sults are in good agreement.The average inclusion size in each zone of the 4 mm thick joint is slightly smaller than that in the 5 mm and 6 mm thick plates.Heat input does not significantly affect the number of inclusions,but increasing heat input tends to enlarge the inclusion size and consequently reduce the weld hardness.Owing to the low heat input and the presence of Ti and Nb microalloying elements in both the welding wire and the base metal,the weld metal and heat-affected zone de-velop a uniform and fine microstructure dominated by acicular ferrite and fine-grained ferrite,which is markedly superior to the coarse-grained structure obtained by conventional submerged arc welding.All tensile specimens fractured in the base metal,and bending specimens showed no cracks,indicating excellent overall mechanical properties.This work establishes a systematic correlation framework linking inclusion characteristics,microstructure,and mechanical properties for laser-arc hybrid welded thin high-strength steel joints,providing technical support for optimizing high-efficiency and high-quality welding processes in shipbuilding and related industries.关键词
薄板高强钢/激光-电弧复合焊/热输入/非金属夹杂物/金相组织/力学性能Key words
thin high-strength steel/laser-arc hybrid welding/heat input/non-metallic inclusions/metallographic structure/mechanical properties分类
矿业与冶金引用本文复制引用
何春华,刘镇,潘喜春,张标,钟美达,卢晓丹..薄板高强钢激光-电弧复合焊非金属夹杂物及金相分析组织性能研究[J].电焊机,2026,56(9):93-104,12.基金项目
广东省重点科技计划项目(2023B1212070026) （2023B1212070026）
