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Effect of pulsed current on the microstructure and mechanical properties of GMAW welded joints of 347H stainless steel
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Xiping WANG1, 2, 3, 4, Xiaoyan ZHU1, 2, 3, 4, Yongdu LI1, 2, 3, 4, Junjie WANG1, 2, 3, 4, Yimin LI1, 2, 3, 4
Pressure Vessel Technology | 2026, 43(2) : 27 - 34
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Pressure Vessel Technology | 2026, 43(2): 27-34
• Experimental Researches •
Effect of pulsed current on the microstructure and mechanical properties of GMAW welded joints of 347H stainless steel
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Xiping WANG1, 2, 3, 4, Xiaoyan ZHU1, 2, 3, 4, Yongdu LI1, 2, 3, 4, Junjie WANG1, 2, 3, 4, Yimin LI1, 2, 3, 4
Affiliations
  • 1Lanzhou LS Heavy Equipment Co.，Ltd.，Lanzhou 730000，China
  • 2Key Laboratory of Pressure Vessel Welding in Gansu Province，Lanzhou 730000，China
  • 3Gansu Province Large Plate Welding Structure Pressure Vessel Technology Innovation Center，Lanzhou 730000，China
  • 4Gansu Provincial Pressure Vessel Industry Technical Center，Lanzhou 730000，China
Published: 2026-02-28 doi: 10.3969/j.issn.1001-4837.2026.02.003
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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.

347H stainless steel  /  pulse  /  gas metal arc welding  /  mechanical properties
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. 压力容器, 2026 , 43 (2) : 27 -34 . DOI: 10.3969/j.issn.1001-4837.2026.02.003
Xiping WANG, Xiaoyan ZHU, Yongdu LI, Junjie WANG, Yimin LI. Effect of pulsed current on the microstructure and mechanical properties of GMAW welded joints of 347H stainless steel[J]. Pressure Vessel Technology, 2026 , 43 (2) : 27 -34 . DOI: 10.3969/j.issn.1001-4837.2026.02.003
Appendix
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Year 2026 volume 43 Issue 2
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Article Info
doi: 10.3969/j.issn.1001-4837.2026.02.003
  • Receive Date：2025-10-20
  • Online Date：2026-10-23
  • Published：2026-02-28
Article Data
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History
  • Received：2025-10-20
  • Revised：2026-01-05
Affiliations
    1Lanzhou LS Heavy Equipment Co.，Ltd.，Lanzhou 730000，China
    2Key Laboratory of Pressure Vessel Welding in Gansu Province，Lanzhou 730000，China
    3Gansu Province Large Plate Welding Structure Pressure Vessel Technology Innovation Center，Lanzhou 730000，China
    4Gansu Provincial Pressure Vessel Industry Technical Center，Lanzhou 730000，China
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表12种不同金属材料的力学参数
科
Family		 属数
Number of
genus		 种数
Number of
species		 占总种数比例
Percentage of
total species (%)		 属
Genus		 种数
Number of
species		 占总种数比例
Percentage of total
species (%)
鹅膏菌科Amanitaceae 2 11 5.26 鹅膏菌属 Amanita 10 4.78
小菇科 Mycenaceae 2 12 5.74 丝盖伞属 Inocybe 5 2.39
多孔菌科 Polyporaceae 8 14 6.70 蜡蘑属 Laccaria 5 2.39
红菇科 Russulaceae 3 23 11.00 小皮伞属 Marasmius 6 2.87
小菇属 Mycena 11 5.26
光柄菇属 Pluteus 5 2.39
红菇属 Russula 17 8.13
栓菌属 Trametes 5 2.39
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