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<p>The study investigates hot cracking susceptibility in AA7075 aluminum alloy weldments using the Houldcraft test methodology. The experimental approach involves TIG welding with ER4043 filler material under varying welding parameters (current: 105–145 A, voltage: 16–20 V). Liquid penetrant testing, X-ray examination, microstructural analysis, hardness measurements, and corrosion resistance evaluation using potentiodynamic polarization tests in different environments (H2SO4, NaCl and HCl) were carried out. The microhardness evaluation revealed distinct variations across different weld zones, with fusion zone exhibiting the highest hardness value of 158±5 HV, followed by the heat affected zone at 138±4 HV, while the base metal showed a hardness of 118±8 HV. The corrosion behavior analysis through potentiodynamic polarization tests revealed varying corrosion potentials in different media: −0.54 V in H<sub>2</sub>SO<sub>4</sub>, −0.62 V in HCl, and −0.90 V in NaCl. Additionally, the corrosion current densities (log icorr) were found to be −5.8 A/cm<sup>2</sup> in H<sub>2</sub>SO<sub>4</sub>, −6.2 A/cm<sup>2</sup> in HCl, and −6.8 A/cm<sup>2</sup> in NaCl.</p>

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Comprehensive investigation of microstructural evolution, mechanical behavior, and corrosion resistance in TIG welded AA7075 alloy with ER4043 filler

  • 期刊论文

  • 发表日期：

    2025年6月28日

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  • S. Omprakasam,
  • R. Raghu,
  • R. Sudhakar,
  • M. P. Saravanan

摘要

The study investigates hot cracking susceptibility in AA7075 aluminum alloy weldments using the Houldcraft test methodology. The experimental approach involves TIG welding with ER4043 filler material under varying welding parameters (current: 105–145 A, voltage: 16–20 V). Liquid penetrant testing, X-ray examination, microstructural analysis, hardness measurements, and corrosion resistance evaluation using potentiodynamic polarization tests in different environments (H2SO4, NaCl and HCl) were carried out. The microhardness evaluation revealed distinct variations across different weld zones, with fusion zone exhibiting the highest hardness value of 158±5 HV, followed by the heat affected zone at 138±4 HV, while the base metal showed a hardness of 118±8 HV. The corrosion behavior analysis through potentiodynamic polarization tests revealed varying corrosion potentials in different media: −0.54 V in H2SO4, −0.62 V in HCl, and −0.90 V in NaCl. Additionally, the corrosion current densities (log icorr) were found to be −5.8 A/cm2 in H2SO4, −6.2 A/cm2 in HCl, and −6.8 A/cm2 in NaCl.