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<p>The objective of this study is to identify the effect of oxide and intermetallic compounds (IMCs) on maximum lap shear load by variation of plunge depth (PD) during friction stir spot welding (FSSW). Two dissimilar metals, namely AA2018-T4 and C10200, were selected for this experimental work. The formation of oxide and IMCs was identified using an energy-dispersive spectroscopy (EDS) study. The X-ray diffraction (XRD) technique was used for the detection of oxide and IMCs, individually. The deformation in the welded zone was examined using the transmission electron microscopy (TEM) technique. The dislocation density and its effect on mechanical properties have been observed. The increase in PD leads to a greater formation of oxide and IMCs. During the variation of PD, the formation of oxides such as CuAlO<sub>2</sub> and Al<sub>2</sub>CuO<sub>4</sub>, as well as the formation of IMCs like CuAl and Al<sub>2</sub>Cu, has been detected. The presence of oxide and IMCs significantly influences the crystallite size. Likewise, variations in PD have a greater impact on the maximum lap shear load of the FSSW joints.</p>

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Analysis of intermetallics and oxide formation by plunging action of the tool in bimetallic AA2018-T4 and C10200 friction stir spot welded products

  • 期刊论文

  • 发表日期：

    2025年5月4日

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  • Suprim Sardar,
  • Partha Pratim Dey

摘要

The objective of this study is to identify the effect of oxide and intermetallic compounds (IMCs) on maximum lap shear load by variation of plunge depth (PD) during friction stir spot welding (FSSW). Two dissimilar metals, namely AA2018-T4 and C10200, were selected for this experimental work. The formation of oxide and IMCs was identified using an energy-dispersive spectroscopy (EDS) study. The X-ray diffraction (XRD) technique was used for the detection of oxide and IMCs, individually. The deformation in the welded zone was examined using the transmission electron microscopy (TEM) technique. The dislocation density and its effect on mechanical properties have been observed. The increase in PD leads to a greater formation of oxide and IMCs. During the variation of PD, the formation of oxides such as CuAlO2 and Al2CuO4, as well as the formation of IMCs like CuAl and Al2Cu, has been detected. The presence of oxide and IMCs significantly influences the crystallite size. Likewise, variations in PD have a greater impact on the maximum lap shear load of the FSSW joints.