Loading...

Comparative study on the microstructures and properties of wire+arc additively manufactured 5356 aluminium alloy with argon and nitrogen as the shielding gas

Li, S ; Sharif University of Technology | 2020

622 Viewed
  1. Type of Document: Article
  2. DOI: 10.1016/j.addma.2020.101206
  3. Publisher: Elsevier B. V , 2020
  4. Abstract:
  5. This research explored the influences of shielding gases on the appearance of weld beads and the microstructures and mechanical properties of thin-wall samples using conventional gas metal arc welding as the heat source by using 5356 aluminium alloy welding wire as the raw materials and nitrogen (N2) and argon (Ar) as the shielding gases. The results showed that under the same parameters and after mono-layer single-bead welding was performed using N2 as the shielding gas, the bead height was higher, the bead width was narrower, and the penetration depth was shallower. The grain size of the thin-wall sample protected by N2 was 43.5–47.8 % smaller than that obtained under Ar protection. However, the sample protected by N2 contained many flaky nitrides, whose presence improved the microhardness but reduced the ultimate tensile strength (UTS) and plasticity. The average UTS of the thin-wall sample protected by N2 in the horizontal direction was 82.5 % of the UTS of the samples shielded using Ar. However, the average elongation in the horizontal direction of the samples protected by N2 was 18.6 % of that of the samples shielded by Ar. The mechanical properties of the sample protected by argon were more excellent. © 2020 Elsevier B.V
  6. Keywords:
  7. 5356 aluminium alloy ; Nitrogen protection ; Wire+arc additive manufacturing ; Argon ; Gas metal arc welding ; Gas welding ; Gases ; Laser beam welding ; Microstructure ; Nitrogen ; Shielding ; Tensile strength ; Thin walled structures ; Bead width ; Comparative studies ; Heat sources ; Microstructures and mechanical properties ; Microstructures and properties ; Shielding gas ; Ultimate tensile strength ; Welding wires ; Aluminum alloys
  8. Source: Additive Manufacturing ; Volume 34 , August , 2020
  9. URL: https://www.sciencedirect.com/science/article/abs/pii/S2214860420305789