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<p>The present research work attempts to narrow down the suitable sized flux for enhancing the weld pentation depth and acceptable weld bead morphology, with reliable coating consistency for welding thicker sections. Nano- and micro-sized TiO<sub>2</sub> flux were used in the study to examine the adherence of the flux particles to determine the ease of coating and their thermal decomposition for melting point depression. Nano-TiO<sub>2</sub> showed a high degree of decomposition, aiding in early melting pointing depression. No significant differences in microstructural features and hardness were observed. However, the nano-TiO<sub>2</sub> weldment exhibited a penetration depth of 5.734 ± 0.2888&#xa0;mm, 22% greater than that of the micro-TiO<sub>2</sub> weldment. Additionally, the bead width of the nano-TiO<sub>2</sub> welds was 24% smaller than that of the micro-TiO<sub>2</sub> welds. The study demonstrates enhanced coating efficiency, penetration depth and narrowed bead width by facilitating earlier melting point depression using nano-sized TiO<sub>2</sub> flux.</p>

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Promising Weld Depth of Penetration by Melting Point Depression Through TiO2 Nano-Flux in Activated TIG Welding of Stainless Steel AISI 304L

  • 期刊论文

  • 发表日期：

    2025年6月17日

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  • M. Santhosh,
  • A. John Rajan,
  • T. Sampath Kumar,
  • A. Vinoth Jebaraj,
  • B. Kannan

摘要

The present research work attempts to narrow down the suitable sized flux for enhancing the weld pentation depth and acceptable weld bead morphology, with reliable coating consistency for welding thicker sections. Nano- and micro-sized TiO2 flux were used in the study to examine the adherence of the flux particles to determine the ease of coating and their thermal decomposition for melting point depression. Nano-TiO2 showed a high degree of decomposition, aiding in early melting pointing depression. No significant differences in microstructural features and hardness were observed. However, the nano-TiO2 weldment exhibited a penetration depth of 5.734 ± 0.2888 mm, 22% greater than that of the micro-TiO2 weldment. Additionally, the bead width of the nano-TiO2 welds was 24% smaller than that of the micro-TiO2 welds. The study demonstrates enhanced coating efficiency, penetration depth and narrowed bead width by facilitating earlier melting point depression using nano-sized TiO2 flux.