Microstructure and Mechanical Properties of High Nitrogen Austenitic Stainless Steel Welded Joints by Using Multi-strand Composite Welding Wire GMAW

LI Jianguo; JIA Dongsheng; ZANG Lei; WANG Lu; WANG Xiaolong

doi:10.7512/j.issn.1001-2303.2025.10.07

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Microstructure and Mechanical Properties of High Nitrogen Austenitic Stainless Steel Welded Joints by Using Multi-strand Composite Welding Wire GMAW
Vol. 55, Issue 10, Pages: 54-65(2025)
Received：28 August 2025，

Published：20 October 2025
DOI： 10.7512/j.issn.1001-2303.2025.10.07
稿件说明：

移动端阅览

李建国，贾冬生，臧磊，等.高氮奥氏体不锈钢绞股焊丝GMAW微观组织和力学性能研究［J］.电焊机，2025，55（10）：54-65. DOI： 10.7512/j.issn.1001-2303.2025.10.07.

.Microstructure and Mechanical Properties of High Nitrogen Austenitic Stainless Steel Welded Joints by Using Multi-strand Composite Welding Wire GMAW[J].Electric Welding Machine, 2025, 55(10): 54-65. DOI： 10.7512/j.issn.1001-2303.2025.10.07.

摘要

采用双丝和单丝的绞股焊丝GMAW焊接厚度为16 mm的高氮奥氏体不锈钢厚板，对比分析了单丝和双丝焊接接头的微观组织和力学性能。结果表明：焊接过程中绞股焊丝的电弧沿缠绕路径熔化发生旋转，降低了焊接飞溅等缺陷；绞股焊丝焊接过程有高的热输入和高的冷却速率，导致绞股焊丝焊接接头有更宽的热影响区，但是焊缝形成比单丝细小的奥氏体柱状晶；力学性能测试发现，绞股焊丝焊接后的焊接接头屈服强度和抗拉强度与实芯单丝的焊接接头相比提高了46.5%和42.3%，延伸率也提高了7%；微观组织显示绞股焊丝焊接后的焊缝产生了更高比例的孪晶，同时，也发现实芯单丝焊缝中铁素体周围有连续的M

析出，形成了一个脆性区域，极大地降低了焊接接头的力学性能。

Abstract

High nitrogen austenitic stainless welded joints were obtained by multi-strand composite welding wire and single wire

respectively

and microstructure and mechanical property of welded joints were investigated.

Results

revealed that rotating arc shape is formed for multi-strand composite welding wire

and welding process of that has higher heat input and cooling rate

which results in larger coarse grain zone along the fusion line and finer columnar austenite grain. Tensile testing shows that multi-strand composite welding wire welded joint has higher yield strength

tensile strength and elongation

which are improved by 46.5%

42.3% and 7% compared with single wire welded joint

respectively. Furthermore

twins strengthening mechanism of weld seam is revealed

and multi-strand composite welding wire weld seam has higher fraction of twins. However

brittle zone formed by continuous carbides is found in weld seam of single wire

which greatly reduces the strength and ductility of single wire welded joint.

关键词

Keywords

references

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