55 kg级低氢高韧性全位置药芯焊丝的研制与性能评价

信国松; 刘晓茹; 邹勇; 常朝祥; 方乃文; 牛董山钰

doi:10.7512/j.issn.1001-2303.2026.08.12

高强钢优质高效焊接 | 浏览量 : 0 下载量: 7 CSCD: 0

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55 kg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
2026年56卷第8期页码：116-122
收稿：2026-07-01，

修回：2026-07-28，

纸质出版：2026-08-20
DOI： 10.7512/j.issn.1001-2303.2026.08.12
稿件说明：

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信国松，刘晓茹，邹勇，等.55 kg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. DOI： 10.7512/j.issn.1001-2303.2026.08.12.

XIN Guosong, LIU Xiaoru, ZOU Yong, et al.Development and Performance Evaluation of a 550 MPa-Grade Low-Hydrogen, High-Toughness Flux-Cored Wire for All-Position Welding[J].Electric Welding Machine, 2026, 56(8): 116-122. DOI： 10.7512/j.issn.1001-2303.2026.08.12.

摘要

针对海洋工程、桥梁及低温服役结构用55 kg级低合金高强钢焊接材料的低氢、高韧性和全位置焊接需求，采用钛碱型渣系和Mn-Si-Ni-Ti-B-RE多元合金体系制备直径1.2 mm的气体保护药芯焊丝，并通过钢带清洗、药粉分级烘焙和焊丝在线复烘干控制扩散氢含量。测试焊丝工艺性能、熔敷金属成分与力学性能、扩散氢含量、裂纹尖端张开位移（CTOD）和显微组织，并采用EH460钢板验证接头性能。结果表明，所制焊丝在平、立、横、仰焊位置下电弧较稳定且脱渣较容易；熔敷金属抗拉强度为601 MPa，屈服强度为540 MPa，断后伸长率为25.0%，-60 ℃冲击吸收功为113~120 J，扩散氢含量为2.90~3.12 mL/100 g，-25 ℃ CTOD值为0.375~0.451 mm。EH460立焊接头抗拉强度为591~593 MPa，焊缝和热影响区-40 ℃平均冲击吸收功分别为153 J和180 J。焊缝金属以针状铁素体为主，冲击断口主要呈韧窝形貌。钛碱型渣系配合Ti-B复合微合金化促进了焊缝中针状铁素体的形成，结合多层降氢工艺实现了低扩散氢与高低温韧性的良好匹配。

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 multicomponent 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 properties

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 energy 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 occurring 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 approximately 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

Keywords

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