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<p>In this work, an attempt was made to study the effect of three different modes of MIG welding processes, namely Conventional MIG, Single Pulse MIG, and Double Pulse MIG (DP-MIG) —on the mechanical and metallurgical characteristics of 15CDV6 high-strength low alloy (HSLA) steel. 15CDV6 plates of thickness 3.7&#xa0;mm were joined in butt joint configuration using identical wire feed speeds across all three welding modes. Weld quality was evaluated through bead geometry analysis, microstructural characterization, tensile strength and micro hardness. Among the three modes, DP-MIG welding exhibited the most favorable results, with a narrower bead width (14.87&#xa0;mm), 22% higher tensile strength compared to Conventional MIG. To further enhance the weld properties, Post-Weld Heat Treatment (PWHT) was applied to the DP-MIG sample, which led to a 16 % increase in tensile strength (from 463 to 536&#xa0;MPa) and a 3% controlled reduction in hardness, indicating improved ductility without compromising strength. EBSD analysis confirmed refined grain boundaries, a transition from mixed to dominant BCC phases, and higher dislocation density. Additionally, Digital Image Correlation (DIC) results for the PWHT-treated sample demonstrated smoother strain localization and a major reduction in maximum shear angle, highlighting better elastic recovery and structural stability. Overall, DP-MIG with PWHT emerged as the optimal welding strategy for 15CDV6 steel, offering superior mechanical performance suitable for critical structural applications.</p>

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Comparative Study of Metal Inert Gas Welding Modes on 15CDV6 Steel for Aerospace Structural Applications

  • 期刊论文

  • 发表日期：

    2025年12月16日

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  • Ajay Amirtharaj P,
  • Rajesh kannan G,
  • Shivaram H,
  • Shristiha B,
  • Deepan Bharathi Kannan T

摘要

In this work, an attempt was made to study the effect of three different modes of MIG welding processes, namely Conventional MIG, Single Pulse MIG, and Double Pulse MIG (DP-MIG) —on the mechanical and metallurgical characteristics of 15CDV6 high-strength low alloy (HSLA) steel. 15CDV6 plates of thickness 3.7 mm were joined in butt joint configuration using identical wire feed speeds across all three welding modes. Weld quality was evaluated through bead geometry analysis, microstructural characterization, tensile strength and micro hardness. Among the three modes, DP-MIG welding exhibited the most favorable results, with a narrower bead width (14.87 mm), 22% higher tensile strength compared to Conventional MIG. To further enhance the weld properties, Post-Weld Heat Treatment (PWHT) was applied to the DP-MIG sample, which led to a 16 % increase in tensile strength (from 463 to 536 MPa) and a 3% controlled reduction in hardness, indicating improved ductility without compromising strength. EBSD analysis confirmed refined grain boundaries, a transition from mixed to dominant BCC phases, and higher dislocation density. Additionally, Digital Image Correlation (DIC) results for the PWHT-treated sample demonstrated smoother strain localization and a major reduction in maximum shear angle, highlighting better elastic recovery and structural stability. Overall, DP-MIG with PWHT emerged as the optimal welding strategy for 15CDV6 steel, offering superior mechanical performance suitable for critical structural applications.