电焊机2026，Vol.56Issue(8)：116-122,7.DOI:10.7512/j.issn.1001-2303.2026.08.12
55kg级低氢高韧性全位置药芯焊丝的研制与性能评价
Development and Performance Evaluation of a 550 MPa-Grade Low-Hydrogen,High-Toughness Flux-Cored Wire for All-Position Welding
摘要
Abstract
To meet the requirements of low diffusible hydrogen,high toughness,and all-position weldability for 55 kg-grade low-alloy high-strength steel structures used in offshore engineering,bridges,and low-temperature service,a 1.2 mm-diameter gas-shielded flux-cored wire was developed using a titania-basic slag system and a Mn-Si-Ni-Ti-B-RE multicompo-nent alloying system.The diffusible hydrogen content was controlled through steel-strip cleaning,flux powder classification baking,and in-line wire redrying.The welding operability,deposited-metal chemical composition and mechanical proper-ties,diffusible hydrogen content,crack tip opening displacement(CTOD),and microstructure were systematically evaluated,and the joint performance was verified using EH460 steel plates.The results show that the developed wire exhibits a stable arc,low spatter,and easy slag removal in the flat,vertical,horizontal,and overhead positions.The deposited metal achieves a tensile strength of 601 MPa,a yield strength of 540 MPa,an elongation after fracture of 25.0％,and an impact absorbed en-ergy of 113-120 J at-60℃.The diffusible hydrogen content is 2.90-3.12 mL/100 g,and the CTOD value at-25℃ranges from 0.375 to 0.451 mm.The vertically welded EH460 joints exhibit tensile strengths of 591-593 MPa,with all fractures oc-curring in the heat-affected zone.The average impact absorbed energies of the weld metal and heat-affected zone at-40℃are 153 J and 180 J,respectively.The weld metal is predominantly composed of acicular ferrite(volume fraction approxi-mately 90％-95％),and the impact fracture surfaces are characterized mainly by dimple morphology.The combination of the titania-basic slag system with Ti-B composite microalloying promotes acicular ferrite formation in the weld metal,and the multi-stage hydrogen-reduction process achieves a favorable balance between low diffusible hydrogen and high low-temperature toughness.关键词
55kg级/低温高韧性/药芯焊丝/钛碱型渣系/针状铁素体Key words
55 kg-grade/low-temperature toughness/flux-cored wire/titania-basic slag system/acicular ferrite分类
矿业与冶金引用本文复制引用
信国松,刘晓茹,邹勇,常朝祥,方乃文,牛董山钰..55kg级低氢高韧性全位置药芯焊丝的研制与性能评价[J].电焊机,2026,56(8):116-122,7.基金项目
国家自然科学基金(52261044) （52261044）
泰山产业领军人才工程(2024001) （2024001）
