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<p>The aim of this study is to evaluate the effect of ER7018, ER80S and ER70S filler metals on the mechanical properties and corrosion behavior of the API X52 steel welded by gas tungsten arc welding (GTAW) and shielded metal arc welding (SMAW) processes. Optical and scanning electron microscopy was conducted to clarify the relationships among, microstructural evolution, and fracture toughness and corrosion resistance of welded joints. Examination of the micro-hardness profile shows a drop in the hardness in the coarse-grained heat affected zone of X52 steel. The highest (avg. 258 HV) and the lowest (avg. 185 HV) micro-hardness were achieved in ER80S and E7018 weld metals, respectively. The highest tensile strength (545MPa) and the lowest strain to failure (13.2%) were obtained by applying ER80S filler metal. Although applying ER70S filler metal reduces tensile strength to 525 MPa in comparison to ER80S, it can improve the strain to failure and also the average impact toughness. The results also indicate that utilizing ER70S filler metal can reduce the corrosion rate by nine times. Whereas, continuously accumulated Fe<sub>3</sub>C on E7018 corroded surface act as new cathodes and raise the corrosion rate.</p>

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The Effect of Welding Consumables on Microstructure, Mechanical Properties and Corrosion Behavior of API X52 Steel Welded Pipes

  • 期刊论文

  • 发表日期：

    2025年4月8日

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  • Ebrahim Safari,
  • Reza Derakhshandeh-Haghighi

摘要

The aim of this study is to evaluate the effect of ER7018, ER80S and ER70S filler metals on the mechanical properties and corrosion behavior of the API X52 steel welded by gas tungsten arc welding (GTAW) and shielded metal arc welding (SMAW) processes. Optical and scanning electron microscopy was conducted to clarify the relationships among, microstructural evolution, and fracture toughness and corrosion resistance of welded joints. Examination of the micro-hardness profile shows a drop in the hardness in the coarse-grained heat affected zone of X52 steel. The highest (avg. 258 HV) and the lowest (avg. 185 HV) micro-hardness were achieved in ER80S and E7018 weld metals, respectively. The highest tensile strength (545MPa) and the lowest strain to failure (13.2%) were obtained by applying ER80S filler metal. Although applying ER70S filler metal reduces tensile strength to 525 MPa in comparison to ER80S, it can improve the strain to failure and also the average impact toughness. The results also indicate that utilizing ER70S filler metal can reduce the corrosion rate by nine times. Whereas, continuously accumulated Fe3C on E7018 corroded surface act as new cathodes and raise the corrosion rate.