电焊机2026，Vol.56Issue(8)：49-59,11.DOI:10.7512/j.issn.1001-2303.2026.08.05
EH40钢用金红石型药芯焊丝熔化极气体保护焊接工艺及组织性能分析
Analysis of Process,Microstructure and Properties of Gas Metal Arc Welding with Rutile Flux-cored Wire for EH40 Steel
摘要
Abstract
Aiming at the problems of insufficient weld toughness and poor strength matching of EH40 high strength steel in engineering welding,a new flux-cored wire with rutile as the main slag system and multi-alloy composite strengthening was independently designed in this paper.The welding test of EH40 high strength steel was carried out by GMAW process.The microstructure evolution of the weld zone,fusion zone and heat affected zone of the welded joint was systematically studied.The core mechanical properties such as tensile,impact and hardness of the joint were tested,and the deposition characteris-tics of the rutile flux-cored wire and the strengthening and toughening mechanism of the joint were revealed.The results show that there are no defects such as pores,cracks and incomplete fusion in the welded joint under the optimized process.The weld zone is mainly composed of acicular ferrite and a small amount of proeutectoid ferrite,showing a network/block distribution.The fusion zone is mainly composed of acicular ferrite and coarse lath bainite,and the microstructure is ex-tremely uneven.The normalizing zone is mainly composed of ferrite,coarse lath bainite and fine granular bainite.The in-complete normalizing zone is mainly composed of fine equiaxed ferrite.The mechanical properties test shows that the heat affected zone near the fusion line is the high hardness zone of the whole joint.The microhardness range of the line is 232-244 HV,the average tensile strength of the welded joint is 597 MPa,the elongation after welding is 27％,and the fracture po-sition is the base metal.Under the condition of-30℃,the average impact performance of the weld zone is 73 J,the average impact performance of the fusion zone is 65.5 J,and the average impact performance of the heat affected zone is 99 J,show-ing a trend of fusion zone<weld zone<heat affected zone.关键词
高强钢/药芯焊丝/熔化极气体保护焊/微观组织/力学性能Key words
High strength steel/flux-cored wire/gas metal arc welding/microstructure/mechanical properties分类
矿业与冶金引用本文复制引用
武鹏博,方乃文,马青军,信国松,常朝祥,陈邵鑫,刘大双,张天理,牛董山钰,邓军林..EH40钢用金红石型药芯焊丝熔化极气体保护焊接工艺及组织性能分析[J].电焊机,2026,56(8):49-59,11.基金项目
泰山产业领军人才工程专项经费(2024001) （2024001）
广西重点研发计划(桂科AB25069254) （桂科AB25069254）
黑龙江省自然科学基金(PL2025E073) （PL2025E073）
