药芯焊丝气保焊对深水导管架高强钢S420焊缝金属微观组织和横向裂纹的影响

武晓刚; 王金生; 马丽; 毕晓健; 李黎霞

doi:10.7512/j.issn.1001-2303.2025.05.15

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药芯焊丝气保焊对深水导管架高强钢S420焊缝金属微观组织和横向裂纹的影响
Effect of Flux-cored Wire Gas Shielded Welding on Microstructure and Transverse Crack of Weld Metal of S420 High Strength Steel for Deep Water Jacket
2025年55卷第5期页码：107-114
收稿：2024-10-08，

修回：2024-12-11，

纸质出版：2025-05-20
DOI： 10.7512/j.issn.1001-2303.2025.05.15
稿件说明：

移动端阅览

武晓刚，王金生，马丽，等.药芯焊丝气保焊对深水导管架高强钢S420焊缝金属微观组织和横向裂纹的影响［J］.电焊机，2025，55（5）：107-114. DOI： 10.7512/j.issn.1001-2303.2025.05.15.

WU Xiaogang, WANG Jinsheng, MA Li, et al.Effect of Flux-cored Wire Gas Shielded Welding on Microstructure and Transverse Crack of Weld Metal of S420 High Strength Steel for Deep Water Jacket[J].Electric Welding Machine, 2025, 55(5): 107-114. DOI： 10.7512/j.issn.1001-2303.2025.05.15.

摘要

深水导管架厚规格S420高强钢在海洋工程实际焊接过程中易产生横向裂纹缺陷。本研究通过低温高湿恶劣环境下的G-BOP试验测试了有缝和无缝药芯焊丝气保焊焊缝在高拘束下的横向裂纹敏感性，研究了不同扩散氢含量对焊缝微观组织和横向裂纹的影响规律。试验结果表明，有缝药芯焊丝气保焊焊缝金属的扩散氢含量和横向裂纹敏感性显著高于无缝药芯焊丝气保焊。在低温高湿环境下，有缝药芯焊丝吸潮导致焊缝金属扩散氢含量显著增加，而且横向裂纹的裂纹率与扩散氢含量呈线性相关性。有缝药芯焊丝气保焊焊缝高扩散氢含量时，焊缝易产生横向裂纹主要是由于焊缝金属中形成大量粗大先共析铁素体和侧板条铁素体组织以及其与针状铁素体的组织不均匀性，氢致裂纹倾向于在先共析铁素体和侧板条铁素体中萌生并沿板条方向扩展；无缝药芯焊丝气保焊焊缝低扩散氢含量时，焊缝金属中少量的先共析铁素体、不连续的奥氏体晶界和杂乱无序交错分布形成互锁结构的针状铁素体可以用来钝化氢致裂纹并中断粗大先共析铁素体的连续性，具有较强抗裂纹扩展能力和较低的横向裂纹敏感性。

Abstract

The thick S420 high strength steel of deep-water jacket is prone to transverse crack defects in the actual welding process of marine engineering. In this paper

the G-BOP test under low temperature and high humidity environment was used to test the transverse crack sensitivity of seam and seamless flux-cored wire gas-shielded welding under high constraints. The effects of different diffusion hydrogen contents on the microstructure and transverse cracks of welds were studied. The experimental results show that the diffusion hydrogen content and transverse crack sensitivity of the weld metal of the gas shielded welding with seam flux-cored wire are significantly higher than those of the gas shielded welding with seamless flux-cored wire. In the low temperature and high humidity environment

the moisture absorption of the seam flux-cored wire leads to a significant increase in the diffusion hydrogen content of the weld metal

and the crack rate of the transverse crack is linearly related to the diffusion hydrogen content. When the content of diffusion hydrogen in the seam flux-cored wire gas shielded welding is high

the transverse crack is easy to occur in the welding seam

which is mainly due to the formation of a large number of coarse proeutectoid ferrite and side lath ferrite in the weld metal and the microstructure inhomogeneity between them and acicular ferrite. The hydrogen induced crack tends to initiate in the proeutectoid ferrite and side lath ferrite and propagate along the lath direction. When the seamless flux-cored wire gas shielded welding has low diffusion hydrogen content

a small amount of proeutectoid ferrite

discontinuous austenite grain boundaries and disordered interlaced acicular ferrite in the weld metal can be used to passivate hydrogen-induced cracks and interrupt the continuity of coarse proeutectoid ferrite

which has strong crack propagation resistance and low transverse crack sensitivity.

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references

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