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<p>The electrode coating composition significantly influences weld quality in shielded metal arc welding (SMAW) of low-carbon steel. However, specific research into the effects of different coating types remains limited. In this work, 10-mm-thick S235JR low-carbon steel plates were welded using two distinct coated electrodes. The E7018-P1 basic-coated electrode was applied with currents ranging from 90 to 110 A and voltages between 22 and 25 V. Conversely, the E7010-P1 cellulosic-coated electrode employed currents from 65 to 75 A and voltages between 28 and 32 V. Both electrode types utilized a 3.2-mm-diameter welding wire and maintained a consistent welding speed of 50 to 120 mm/min. The effects of electrodes coating composition on the microstructural and mechanical properties of welded joints were examined. The characterization methods employed included optical microscopy (OM), scanning electron microscopy (SEM), X-ray diffraction (XRD), and mechanical tests such as tensile and Charpy V-notch impact tests. Our results showed that the basic weld exhibited fracture outside the fusion zone (FZ), specifically in the heat-affected zone (HAZ), and demonstrated superior ductility with an elongation (E) of 12.95% compared to the 9.20% of the cellulosic weld. However, its ultimate tensile strength (UTS) of 429.03 MPa was slightly lower than that of the cellulosic weld (445.10 MPa). The Charpy V-notch impact toughness of the basic FZ was approximately 160 J, which is higher than that of the cellulosic FZ (147.5 J). XRD analysis revealed no precipitation of deleterious phases; however, grain refinement was observed in the cellulosic FZ. Ultimately, the weld produced using the basic-coated electrode exhibited superior properties in terms of ductility, toughness, and weld bead smoothness.</p>

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Effect of electrode coating on the microstructural and mechanical properties of S235JR steel weldment

  • 期刊论文

  • 发表日期：

    2025年7月14日

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  • Besma Mebarki,
  • Said Dehimi,
  • Ahmed Kellai,
  • Liamine Kaba,
  • Sami Kahla,
  • Zoheir Boutaghou,
  • Tarek Bendris

摘要

The electrode coating composition significantly influences weld quality in shielded metal arc welding (SMAW) of low-carbon steel. However, specific research into the effects of different coating types remains limited. In this work, 10-mm-thick S235JR low-carbon steel plates were welded using two distinct coated electrodes. The E7018-P1 basic-coated electrode was applied with currents ranging from 90 to 110 A and voltages between 22 and 25 V. Conversely, the E7010-P1 cellulosic-coated electrode employed currents from 65 to 75 A and voltages between 28 and 32 V. Both electrode types utilized a 3.2-mm-diameter welding wire and maintained a consistent welding speed of 50 to 120 mm/min. The effects of electrodes coating composition on the microstructural and mechanical properties of welded joints were examined. The characterization methods employed included optical microscopy (OM), scanning electron microscopy (SEM), X-ray diffraction (XRD), and mechanical tests such as tensile and Charpy V-notch impact tests. Our results showed that the basic weld exhibited fracture outside the fusion zone (FZ), specifically in the heat-affected zone (HAZ), and demonstrated superior ductility with an elongation (E) of 12.95% compared to the 9.20% of the cellulosic weld. However, its ultimate tensile strength (UTS) of 429.03 MPa was slightly lower than that of the cellulosic weld (445.10 MPa). The Charpy V-notch impact toughness of the basic FZ was approximately 160 J, which is higher than that of the cellulosic FZ (147.5 J). XRD analysis revealed no precipitation of deleterious phases; however, grain refinement was observed in the cellulosic FZ. Ultimately, the weld produced using the basic-coated electrode exhibited superior properties in terms of ductility, toughness, and weld bead smoothness.