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<p>This work aims to evaluate the effect of the number of welding passes and the thickness of ASTM A743 CA6NM martensitic stainless-steel plates on joints welded by the TIG process. Plates with 5 mm and 15 mm thickness were welded in a single pass and in eight passes, respectively. The filling material used was the ER410NiMo alloy, in the form of rods with a 2.4 mm diameter. Before the welding passes, the samples were preheated up to 150 °C. The characterization of the welded samples was performed with the aid of optical microscopy, scanning electron microscopy (SEM-FEG), electron backscatter diffraction (EBSD), and Vickers hardness. The experiments revealed that the sample welded in a single pass presented a higher amount of delta ferrite, with a network morphology, preferably located inside the weld bead and in the high-temperature (HT) heat-affected zone (HAZ). In the sample welded in eight passes, the delta ferrite presented different morphologies, preferably observed in the inter-pass regions, inside the weld beads, and in the high-temperature HAZ. Overheating in the inter-pass region resulted in HAZ width variation, which increased towards the bottom of the welded joint.</p>

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Effects of single-pass and multi-pass TIG welding on the microstructure of CA6NM steel

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年2月27日

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  • Willian Ricardo dos Santos,
  • Henrique Ajuz Holzmann,
  • Anderson Geraldo Marenda Pukasiewicz,
  • Selauco Vurobi Junior,
  • Marcio Ferreira Hupalo

摘要

This work aims to evaluate the effect of the number of welding passes and the thickness of ASTM A743 CA6NM martensitic stainless-steel plates on joints welded by the TIG process. Plates with 5 mm and 15 mm thickness were welded in a single pass and in eight passes, respectively. The filling material used was the ER410NiMo alloy, in the form of rods with a 2.4 mm diameter. Before the welding passes, the samples were preheated up to 150 °C. The characterization of the welded samples was performed with the aid of optical microscopy, scanning electron microscopy (SEM-FEG), electron backscatter diffraction (EBSD), and Vickers hardness. The experiments revealed that the sample welded in a single pass presented a higher amount of delta ferrite, with a network morphology, preferably located inside the weld bead and in the high-temperature (HT) heat-affected zone (HAZ). In the sample welded in eight passes, the delta ferrite presented different morphologies, preferably observed in the inter-pass regions, inside the weld beads, and in the high-temperature HAZ. Overheating in the inter-pass region resulted in HAZ width variation, which increased towards the bottom of the welded joint.