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<p>Tungsten Inert Gas (TIG) welding is commonly used in making stainless-steel structures because it offers a better quality weld with less spatter and precise heat control. The aim of this study Department of Production Engineering is to determine the effect welding current, shielded gas flow rate and weld speed on surface roughness (Ra) quantity parameters Ultimate Tensile Strength And UTS joints AISI 304 stainless-steel. Seventeen experimental runs were created using a Central Composite Design (CCD) under Response Surface Methodology (RSM), with operating parameters at welding current ranging from 85&#xa0;A to 110&#xa0;A, gas flow rate from 11 to 15&#xa0;L/min and corresponding welding speed in the range of [60&#xa0;mm/min;80&#xa0;mm /min]. In the case of surface roughness, quadratic RSM models were found to be highly significant (F = 100.23, <i>p</i> &lt; 0.0001), with all three main factors — current(<i>p</i> = 0.0019), gas flow rate (<i>p</i> &lt; 0.0001) and welding speed (= 5)<i>p</i> = 0052—statistically identified as an influential factor in pair completion level(A). The minimum Ra of 1.21&#xa0;μm was accomplished with centre-point condition (97&#xa0;A, 13&#xa0;L/min, 70&#xa0;mm/min). The quadratic model for UTS was not significant (<i>p</i> = 0.4293); hence, UTS data is provided descriptively with maximum observed value at the centre-point condition of 587&#xa0;MPa. These results provide a validation of the data-driven framework for practitioners to make industrially relevant selections of TIG-welding parameters that will achieve reduced surface roughness in stainless-steel applications.</p>

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Investigating the influence of weld parameters on surface quality and tensile performance of tig-welded stainless-steel joints

  • 期刊论文

  • 发表日期：

    2026年7月21日

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  • B. Radha Krishnan,
  • G. Gopalaramasubramaniyan,
  • A. Sirajunnisa,
  • K. Sureshkumar,
  • P. Pandiarajan,
  • Ambrose Edward Irudayaraj

摘要

Tungsten Inert Gas (TIG) welding is commonly used in making stainless-steel structures because it offers a better quality weld with less spatter and precise heat control. The aim of this study Department of Production Engineering is to determine the effect welding current, shielded gas flow rate and weld speed on surface roughness (Ra) quantity parameters Ultimate Tensile Strength And UTS joints AISI 304 stainless-steel. Seventeen experimental runs were created using a Central Composite Design (CCD) under Response Surface Methodology (RSM), with operating parameters at welding current ranging from 85 A to 110 A, gas flow rate from 11 to 15 L/min and corresponding welding speed in the range of [60 mm/min;80 mm /min]. In the case of surface roughness, quadratic RSM models were found to be highly significant (F = 100.23, p < 0.0001), with all three main factors — current(p = 0.0019), gas flow rate (p < 0.0001) and welding speed (= 5)p = 0052—statistically identified as an influential factor in pair completion level(A). The minimum Ra of 1.21 μm was accomplished with centre-point condition (97 A, 13 L/min, 70 mm/min). The quadratic model for UTS was not significant (p = 0.4293); hence, UTS data is provided descriptively with maximum observed value at the centre-point condition of 587 MPa. These results provide a validation of the data-driven framework for practitioners to make industrially relevant selections of TIG-welding parameters that will achieve reduced surface roughness in stainless-steel applications.