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<p>This work proposes to impart controlled bending of metal sheets by localized heating using tungsten inert gas (TIG) arc. AISI 304 steel sheet was formed varying arc current (<i>I</i>), scan speed of the TIG torch (<i>v</i><sub>s</sub>), dwell time between successive scans (<i>t</i><sub>d</sub>), number of the scan passes (<i>n</i>) and distance of the bending edge (i.e. scan path) from the free edge (<i>a</i>). The bending angle was achieved, increased with increase in <i>I</i> and <i>n</i> but reduced with <i>v</i><sub>s</sub>, <i>t</i><sub>d</sub> and <i>a</i>. Such thermal forming by TIG has not been reported before. This is inspired by the other two thermal forming processes, namely <i>Laser forming</i> and <i>Line heating</i> or <i>Flame forming</i> which use laser and oxy-acetylene gas flame respectively. In both the processes, high bending angle per scan pass necessitated surface melting (up to 46.4% in laser forming). In the current experiments on the proposed method which is cheaper than laser forming and more precise than flame forming, maximum melting remained within 32.15% of the sheet thickness. Bending angle per scan pass (0.7 – 1°) and edge effect (i.e. variation of bending angle along the scan path) both comparable to laser forming could be achieved at a scan speed in the range of 15 – 21 mm/s.</p>

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Controlled bending of metal sheets using tungsten inert gas arc

  • 期刊论文

  • 发表日期：

    2025年6月23日

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  • Debendranath De,
  • Soumyajit Kundu,
  • Ankit Shrivastava,
  • Manidipto Mukherjee,
  • Kuntal Maji,
  • Subhas Chandra Moi,
  • Shitanshu Shekhar Chakraborty

摘要

This work proposes to impart controlled bending of metal sheets by localized heating using tungsten inert gas (TIG) arc. AISI 304 steel sheet was formed varying arc current (I), scan speed of the TIG torch (vs), dwell time between successive scans (td), number of the scan passes (n) and distance of the bending edge (i.e. scan path) from the free edge (a). The bending angle was achieved, increased with increase in I and n but reduced with vs, td and a. Such thermal forming by TIG has not been reported before. This is inspired by the other two thermal forming processes, namely Laser forming and Line heating or Flame forming which use laser and oxy-acetylene gas flame respectively. In both the processes, high bending angle per scan pass necessitated surface melting (up to 46.4% in laser forming). In the current experiments on the proposed method which is cheaper than laser forming and more precise than flame forming, maximum melting remained within 32.15% of the sheet thickness. Bending angle per scan pass (0.7 – 1°) and edge effect (i.e. variation of bending angle along the scan path) both comparable to laser forming could be achieved at a scan speed in the range of 15 – 21 mm/s.