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<p>HSLA steels are widely used in hull structures of contemporary submarines and warships. To improve productivity without compromising property requirements, an attempt has been made to weld HSLA steels using hot wire GTA welding (HWGTAW) and compared with conventional GTA welding (GTAW). Microstructural evolution and mechanical properties were compared between the joints. Additionally, the weld joint's resistance to sulfide stress corrosion (SSC) cracking and residual stress measurement using X-ray diffraction technique were assessed. The results indicate that the mechanical properties of HWGTAW and GTAW are comparable, and higher than base metal due to the formation of acicular ferrite in the weld region. The SSC cracking resistance of both welds is in acceptable range. Higher heat input results in higher tensile residual stress values in HWGTAW than GTAW; however, it is lesser than yield strength. Weld joints made by HWGTAW exhibit comparable mechanical properties with that of GTAW process with enhanced productivity due to higher deposition rates.</p>

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Study of Microstructure, Mechanical Properties and SCC Resistance of HSLA Steel for Naval Applications

  • 期刊论文

  • 发表日期：

    2025年6月26日

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  • V. Arunkumar,
  • S. Jerome,
  • P. Vasantharaja,
  • M. Vasudevan

摘要

HSLA steels are widely used in hull structures of contemporary submarines and warships. To improve productivity without compromising property requirements, an attempt has been made to weld HSLA steels using hot wire GTA welding (HWGTAW) and compared with conventional GTA welding (GTAW). Microstructural evolution and mechanical properties were compared between the joints. Additionally, the weld joint's resistance to sulfide stress corrosion (SSC) cracking and residual stress measurement using X-ray diffraction technique were assessed. The results indicate that the mechanical properties of HWGTAW and GTAW are comparable, and higher than base metal due to the formation of acicular ferrite in the weld region. The SSC cracking resistance of both welds is in acceptable range. Higher heat input results in higher tensile residual stress values in HWGTAW than GTAW; however, it is lesser than yield strength. Weld joints made by HWGTAW exhibit comparable mechanical properties with that of GTAW process with enhanced productivity due to higher deposition rates.