Editorial Board Members’ Collection Series: Advanced Welding Technologies

A special issue of Metals (ISSN 2075-4701). This special issue belongs to the section "Welding and Joining".

Deadline for manuscript submissions: closed (31 October 2023) | Viewed by 1087

Special Issue Editors


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Guest Editor

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CENIMAT/I3N, Department of Materials Science, NOVA School of Science and Technology, Universidade NOVA de Lisboa, 2829-516 Caparica, Portugal
Interests: advanced characterization; martensitic transformation; thermomechanical processing; welding; synchrotron radiation; additive manufacturing
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Special Issue Information

Dear Colleagues,

Welding processes are a constant in the manufacture of components, from connecting small electronic chips to the structures of a nuclear plant. Naturally, for each component to be welded, each material and each quality requirement requires a different welding process and appropriate operating method so that the function of the obtained welded joint can be ensured.

Among other welding processes, laser welding has undergone major transformations both in terms of ease of use and the cost of implementation in various industries, becoming an extremely used and investigated process. Along with this process, electron beam welding has also grown in the field of applications, currently having the ability to weld more than 200 mm in total penetration in autogenous mode.

Although some techniques have been implemented and studied for several decades, the interest of researchers in advanced welding technologies has not diminished, as can be seen through new process techniques that have emerged or concerning the welding of dissimilar materials, in addition to many other notable developments in laser welding, such as microdevices, simulation, and digital twins, as well as the new additive manufacturing (AM) processes using green or blue lasers.

The AM of metals by powder bed processes has probably shown the greatest growth in industrial manufacturing; however, wire-based methods, as in welding, are also showing significant industry adoption whilst being widely researched at a fundamental level.

In this sense, this Special Issue aims to provide a forum for researchers, engineers, and practitioners to review the state of the art in high-performance advanced welding technologies, particularly the machines, processes, systems, and underlying science and fundamentals, and to identify possible directions for future R&D and applications.

Prof. Dr. António Bastos Pereira
Prof. Dr. João Pedro Oliveira
Guest Editors

Manuscript Submission Information

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Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2600 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • welding processes
  • advanced welding
  • laser welding
  • electron beam welding
  • digital twin in welding
  • directed energy deposition
  • 3D printing of metals
  • direct metal laser sintering

Published Papers (1 paper)

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Research

40 pages, 16595 KiB  
Article
Experimental Investigations in the Processing of AISI H11 Powder Blends Enriched with Tungsten Carbide Nanoparticles for the Additive Manufacturing of Tailored Hot Working Tools in the Directed Energy Deposition (DED-LB/M)—Impact of Tungsten Carbide Nanoparticles on Microstructural and Mechanical Characteristics
by Oliver Hentschel, Jan Kohlstruck, Johannes Vetter, Alexander Wittmann, Pavel Krakhmalev, Dimitrios Nikas and Michael Schmidt
Metals 2024, 14(2), 188; https://doi.org/10.3390/met14020188 - 02 Feb 2024
Viewed by 839
Abstract
In this study, the DED-LB/M process of AISI H11 tool steel powder blends modified by adding WC nanoparticles (WC-np) in concentrations of 1, 2.5 and 5 wt.-% was the object of scientific investigations. For this, 30-layer cuboid specimens were manufactured. The overall scientific [...] Read more.
In this study, the DED-LB/M process of AISI H11 tool steel powder blends modified by adding WC nanoparticles (WC-np) in concentrations of 1, 2.5 and 5 wt.-% was the object of scientific investigations. For this, 30-layer cuboid specimens were manufactured. The overall scientific aim was to examine how the WC-np interact with the steel melt and in the end, influence the processability, microstructure and mechanical properties of produced specimens. The examinations were carried out on both as-built and thermally post-processed specimens. An advanced microstructural analysis (SEM, EDS, EBSD and XRD) revealed that due to the high solubility of WC-np in the molten steel, most of the WC-np appear to have dissolved during the ongoing laser process. Furthermore, the WC-np favor a stronger distortion and finer grain size of martensite in the manufactured specimens. An increase in hardness from about 650 HV1 for the H11 specimen to 780 HV1 for the one manufactured using the powder blend containing 5 wt.-% of WC-np was observed in as-built conditions. In the same way, the compression yield strength enhanced from 1839 MPA to 2188 MPA. The hardness and strength increasing effect of WC-np remained unchanged even after heat treatments similar to those used in industry. Full article
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