Scholarlink

<p>This study investigates the effect of welding speed on the evolution of Inconel-625 (IN-625) weld beads on medium carbon steel (AISI 4140) using a synergic MIG welding process. Bead-on-plate experiments were performed at welding speeds of 500, 550 and 600&#xa0;mm/min while maintaining constant current and voltage. The influence of speed variation on bead geometry, dilution, microstructure, hardness, and corrosion resistance was assessed. Results showed that increasing welding speed reduced heat input, leading to a 38% decrease in weld penetration and a 54% reduction in geometric dilution. Microstructural analysis revealed martensitic transformations in the heat-affected zone (HAZ) and columnar dendritic structures within the weld bead. XRD analysis confirmed the presence of a γ-Ni-rich matrix with minimal deviation in lattice parameters (&lt; 5%). Microhardness tests indicated the highest hardness in the coarse-grained HAZ due to martensite formation. Corrosion tests in 3.5% NaCl solution demonstrated enhanced resistance at higher welding speeds, with the lowest passivating current and highest breakdown voltage observed at 600&#xa0;mm/min. The findings provide insights for optimizing weld overlay parameters in applications demanding high-performance joints, particularly in the aerospace, marine, petroleum and nuclear sectors.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Study of IN-625 Weld Bead on AISI 4140 via Synergic MIG: Welding Speed Effects on Bead Geometry, Microstructure and Corrosion Resistance for High-Performance Joints

  • 期刊论文

  • 发表日期：

    2025年9月29日

查看全文
  • Ashutosh Bagchi,
  • Qasim Murtaza,
  • K. Srinivas

摘要

This study investigates the effect of welding speed on the evolution of Inconel-625 (IN-625) weld beads on medium carbon steel (AISI 4140) using a synergic MIG welding process. Bead-on-plate experiments were performed at welding speeds of 500, 550 and 600 mm/min while maintaining constant current and voltage. The influence of speed variation on bead geometry, dilution, microstructure, hardness, and corrosion resistance was assessed. Results showed that increasing welding speed reduced heat input, leading to a 38% decrease in weld penetration and a 54% reduction in geometric dilution. Microstructural analysis revealed martensitic transformations in the heat-affected zone (HAZ) and columnar dendritic structures within the weld bead. XRD analysis confirmed the presence of a γ-Ni-rich matrix with minimal deviation in lattice parameters (< 5%). Microhardness tests indicated the highest hardness in the coarse-grained HAZ due to martensite formation. Corrosion tests in 3.5% NaCl solution demonstrated enhanced resistance at higher welding speeds, with the lowest passivating current and highest breakdown voltage observed at 600 mm/min. The findings provide insights for optimizing weld overlay parameters in applications demanding high-performance joints, particularly in the aerospace, marine, petroleum and nuclear sectors.