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<p>Wire arc additive manufacturing (WAAM) enables efficient fabrication of large aluminium components, but AA7075 processing is challenging due to hot cracking and unstable bead formation. This study investigates the influence of wire feed rate, welding speed, and arc length correction on bead geometry of WAAM-fabricated AA7075–Nano-TiC composites using a robotic cold metal transfer welding. Multi-response optimization using TOPSIS identified optimal parameters (8&#xa0;m/min WFR, 150&#xa0;mm/min WS, − 5% ALC). SEM, EDS and EBSD analyses revealed the refined grains with uniformly distributed TiC particles and strong metallurgical bonding.</p>

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Metallurgical and Geometrical Characterization of WAAM-Fabricated AA7075–Nano-TiC Metal Matrix Composite Using Cold Metal Transfer

  • 期刊论文

  • 发表日期：

    2026年5月24日

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  • S. Arulkumar,
  • V. Anandakrishnan,
  • L. Sheik Ismail,
  • S. R. Kavin Raj,
  • S. Jayasankari

摘要

Wire arc additive manufacturing (WAAM) enables efficient fabrication of large aluminium components, but AA7075 processing is challenging due to hot cracking and unstable bead formation. This study investigates the influence of wire feed rate, welding speed, and arc length correction on bead geometry of WAAM-fabricated AA7075–Nano-TiC composites using a robotic cold metal transfer welding. Multi-response optimization using TOPSIS identified optimal parameters (8 m/min WFR, 150 mm/min WS, − 5% ALC). SEM, EDS and EBSD analyses revealed the refined grains with uniformly distributed TiC particles and strong metallurgical bonding.