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<p>Tantalum and its alloys present several challenges during welding. Among the available joining techniques, laser beam welding offers significant advantages over conventional arc and resistance welding processes. The weldability of Ta-2.5&#xa0;W sheet with a thickness of 0.8&#xa0;mm was investigated through bead-on-plate laser beam welding (BOP-LBW) by evaluating the influence of welding parameters: beam power (300 to 600&#xa0;W), welding speed (0.5 to 3.0&#xa0;mm/min), and shielding gas flow (0–10&#xa0;L/min). For this purpose, 14 BOP-LBW welds (using a 2&#xa0;kW multi-mode Yb: fiber laser) were performed and evaluated through visual inspection, cross-sectional weld bead analysis, Vickers hardness, X-ray Diffraction, three-point bend, and tensile (with 2 sample geometries: with and without notch) tests. The importance of shielding gas was evident, as its absence led to the incorporation of atmospheric oxygen into the molten pool, resulting in the formation of Ta₂O₅ particles and cracks in the weld bead. Three parameter sets (P500S1.25F10, P400S0.5, and P600S3.0) presented full penetration and defect-free cross sections and exhibited weld bead hardness values close to those of the base metal (BM). P500S1.25F10, P400S0.5, and P600S3.0 samples exhibited ductile behavior in three-point bend tests, with no fractures observed in the weld bead. The tensile results revealed a clear reduction in mechanical performance after BOP-LBW compared to BM, with a decrease of up to 12% in ultimate tensile strength (UTS) and 21% in elongation at fracture (EF). Nevertheless, notched specimens subjected to tensile testing still exhibited ductile behavior.</p>

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Bead-on-plate laser beam welding (BOP-LBW) of Ta-2.5 W (wt%) alloy sheet

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年8月5日

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  • Helder Atassis de Carvalho,
  • Maria Ismenia Sodero Todedo Faria,
  • Milton Sergio Fernandes de Lima,
  • Vitor Chacon Anelli,
  • Carlos Antônio Reis Pereira Baptista,
  • Saulo Brinco Diniz,
  • Carlos Angelo Nunes

摘要

Tantalum and its alloys present several challenges during welding. Among the available joining techniques, laser beam welding offers significant advantages over conventional arc and resistance welding processes. The weldability of Ta-2.5 W sheet with a thickness of 0.8 mm was investigated through bead-on-plate laser beam welding (BOP-LBW) by evaluating the influence of welding parameters: beam power (300 to 600 W), welding speed (0.5 to 3.0 mm/min), and shielding gas flow (0–10 L/min). For this purpose, 14 BOP-LBW welds (using a 2 kW multi-mode Yb: fiber laser) were performed and evaluated through visual inspection, cross-sectional weld bead analysis, Vickers hardness, X-ray Diffraction, three-point bend, and tensile (with 2 sample geometries: with and without notch) tests. The importance of shielding gas was evident, as its absence led to the incorporation of atmospheric oxygen into the molten pool, resulting in the formation of Ta₂O₅ particles and cracks in the weld bead. Three parameter sets (P500S1.25F10, P400S0.5, and P600S3.0) presented full penetration and defect-free cross sections and exhibited weld bead hardness values close to those of the base metal (BM). P500S1.25F10, P400S0.5, and P600S3.0 samples exhibited ductile behavior in three-point bend tests, with no fractures observed in the weld bead. The tensile results revealed a clear reduction in mechanical performance after BOP-LBW compared to BM, with a decrease of up to 12% in ultimate tensile strength (UTS) and 21% in elongation at fracture (EF). Nevertheless, notched specimens subjected to tensile testing still exhibited ductile behavior.