压力容器2026，Vol.43Issue(2)：27-34,8.DOI:10.3969/j.issn.1001-4837.2026.02.003
脉冲电流对347H不锈钢GMAW焊接接头微观组织和力学性能的影响
Effect of pulsed current on the microstructure and mechanical properties of GMAW welded joints of 347H stainless steel
摘要
Abstract
To investigate the applicability of gas metal arc welding(GMAW)in high-temperature molten salt storage tank engineering,two welding process tests,with and without pulse application,were conducted on 347H stainless steel.The microstructure of the welded joints was observed using optical microscopy and scanning electron microscopy,and their mechanical properties were evaluated.The results show that the welded joint without pulse application exhibited slag inclusion defects,while the welded joint with pulse application showed no slag inclusion,porosity,or other defects;the weld microstructure mainly consisted of columnar and dendritic austenite and precipitated phases.In contrast,the welded joint with pulse application exhibited high-temperature tensile properties at 565℃(Rm≥139 MPa,Rp0.2≥360 MPa)and low-temperature impact properties at-196℃(≥31 J)that met the requirements of GB/T 150-2024 and related manufacturing engineering technical specifications.This study provides theoretical and experimental support for the reliable application and quality assurance of GMAW welding technology in the manufacturing field of stainless steel pressure vessels.关键词
347H不锈钢/脉冲/熔化极气体保护焊/力学性能Key words
347H stainless steel/pulse/gas metal arc welding/mechanical properties分类
机械制造引用本文复制引用
王喜平,朱小燕,李永都,王军杰,李义民..脉冲电流对347H不锈钢GMAW焊接接头微观组织和力学性能的影响[J].压力容器,2026,43(2):27-34,8.基金项目
国家市场监督管理总局科技计划项目(2024MK129) （2024MK129）
甘肃省重点研发计划-工业类项目(24YGA018) （24YGA018）
