电焊机2025，Vol.55Issue(10)：54-65,12.DOI:10.7512/j.issn.1001-2303.2025.10.07
高氮奥氏体不锈钢绞股焊丝GMAW微观组织和力学性能研究
Microstructure and Mechanical Properties of High Nitrogen Austenitic Stainless Steel Welded Joints by Using Multi-strand Composite Welding Wire GMAW
李建国 1贾冬生 1臧磊 1王璐 1王小龙1
作者信息
- 1. 内蒙古第一机械集团股份有限公司,内蒙古 包头 014030||特种车辆设计制造集成技术全国重点实验室,内蒙古 包头 014030
- 折叠
摘要
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 ro-tating 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
高氮奥氏体不锈钢/绞股焊丝/熔化极气体保护焊/微观组织/力学性能Key words
High nitrogen austenitic stainless steel/Multi-strand composite welding wire/Gas metal arc welding/Micro-structure/Mechanical property分类
矿业与冶金引用本文复制引用
李建国,贾冬生,臧磊,王璐,王小龙..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):54-65,12.
