Advanced Welding Processes, Additive Manufacturing and Numerical Models: 2nd Edition

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Guest Editor
School of Mechanical Engineering, Shanghai Jiao Tong University, Shanghai 200240, China
Interests: welding mechanics; FEA simulation; additive manufacturing; engineering software
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Special Issue Information

Dear Colleagues,

Welding and additive manufacturing are key technologies in the modern manufacturing industry that increasingly require high-quality products, high-volume deposition, and high-temperature application. New types of materials and structures, such as functionally graded materials and lattice structures, can be fabricated by additive manufacturing, which is superior to traditional processes. Advanced welding processes and additive manufacturing, as well as their digital twins, will significantly contribute to manufacturing technology and the process development of materials.

This Special Issue aims to highlight the latest progress on the welding process and additive manufacturing development towards the fabrication of new structures, the innovation of functional materials, and the optimization of manufacturing processes. Full-length research articles on welding technology development, weld consumables, powder material, the additive manufacturing process, numerical modeling, and process monitoring and control, among other topics, are welcome. The world’s leading experts in the field of welding and additive manufacturing will be invited to submit their findings. Accepted papers will be available via open access for the whole research community in order to increase the visibility of the authors’ innovative research findings.

Dr. Hui Huang
Guest Editor

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Keywords

  • welding
  • additive manufacturing
  • process monitoring
  • modeling

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Published Papers (1 paper)

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Research

17 pages, 22554 KiB  
Article
Static and Fatigue Strength of Graphene Nanoplatelet-Reinforced AA6061-T6 Friction Stir Spot-Welded Lap Joints
by Amir Alkhafaji, Daniel Camas and Hayder Al-Asadi
J. Manuf. Mater. Process. 2025, 9(3), 98; https://doi.org/10.3390/jmmp9030098 - 18 Mar 2025
Viewed by 417
Abstract
Despite the significant economic and environmental advantages of friction stir spot welding (FSSW) and its amazing results in welding similar and dissimilar metals and alloys, some of which were known as unweldable, it has some structural and characteristic defects such as keyhole formation, [...] Read more.
Despite the significant economic and environmental advantages of friction stir spot welding (FSSW) and its amazing results in welding similar and dissimilar metals and alloys, some of which were known as unweldable, it has some structural and characteristic defects such as keyhole formation, hook defects, and bond line oxidation. This has prompted researchers to focus on these defects and propose and investigate techniques to treat or compensate for their deteriorating effects on microstructural and mechanical properties under different loading conditions. In this experimental study, sheets of AA6061-T6 aluminum alloy with a thickness of 1.8 mm were employed to investigate the influence of reinforcement by graphene nanoplatelets (GNPs) with lateral sizes of 1–10 µm and thicknesses of 3–9 nm on the static and fatigue behavior of FSSW lap joints. The welding process was carried out with constant, predetermined welding parameters and a constant amount of nanofiller throughout the experiment. Cross-sections of as-welded specimens were tested by optical microscope (OM) and energy-dispersive spectroscopy (EDS) to ensure the incorporation of the nanographene into the matrix of the base alloy by measuring the weight percentage (wt.%) of carbon. Microhardness and tensile tests revealed a significant improvement in both tensile shear strength and micro-Vickers hardness due to the reinforcement process. The fatigue behavior of the GNP-reinforced FSSW specimens was evaluated under low and high cycle fatigue conditions. The reinforcement process had a detrimental effect on the fatigue life of the joints under cyclic loading conditions. The microstructural analysis and examinations conducted during this study revealed that this reduction in fatigue strength is attributed to the agglomeration of GNPs at the grain boundaries of the aluminum matrix, leading to porosity in the stir zone (SZ), the formation of continuous brittle phases, and a transition in the fracture mechanism from ductile to brittle. The experimental results, including fracture modes, are presented and thoroughly discussed. Full article
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