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Novel Research and Advanced Technology in Laser Welding and Laser...
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Novel Research and Advanced Technology in Laser Welding and Laser Additive Manufacturing

A special issue of Metals (ISSN 2075-4701). This special issue belongs to the section "Additive Manufacturing".

Deadline for manuscript submissions: closed (25 March 2024) | Viewed by 7795

Special Issue Editor

Dr. Leilei Wang

E-Mail Website
Guest Editor
College of Materials Science and Technology, Nanjing University of Aeronautics and Astronautics, Nanjing 211106, China
Interests: laser welding; additive manufacturing; numerical simulation; welding metallurgy

Special Issue Information

Dear Colleagues,

The laser beam is widely used as a heat source during welding and additive manufacturing, due to its high flexibility, high efficiency, and high precision. Laser welding and laser additive manufacturing provide a pathway to fabricate large-scale metallic components for aerospace, automotive, and offshore applications. Articles focusing on the review, investigation, and innovations of laser welding and laser additive manufacturing are welcome in this Special Issue of Metals. Research on laser welding and laser additive manufacturing of lightweight materials, such as aluminum and titanium alloys is welcome. Additionally, articles regarding the novel process, numerical simulation and online defect monitoring during laser welding and laser additive manufacturing are particularly welcome.

Dr. Leilei Wang
Guest Editor

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Metals is an international peer-reviewed open access monthly journal published by MDPI.

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

  • hybrid laser arc welding
  • selective laser melting
  • laser melting deposition
  • numerical simulation of laser welding
  • defect detection and intelligent evaluation of laser welding
  • laser welding in extreme environment

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Published Papers (3 papers)

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Research

14 pages, 14826 KiB  
Article
Study on the Effect of Preheating Temperatures on Melt Pool Stability in Inconel 718 Components Processed by Laser Powder Bed Fusion
by Niccolò Baldi, Alessandro Giorgetti, Marco Palladino, Iacopo Giovannetti, Gabriele Arcidiacono and Paolo Citti
Metals 2023, 13(10), 1792; https://doi.org/10.3390/met13101792 - 23 Oct 2023
Cited by 3 | Viewed by 1631
Abstract
Laser Powder Bed Fusion (L-PBF) is one of the most widespread, versatile, and promising metal Additive Manufacturing (AM) techniques. L-PBF allows for the manufacturing of geometrically complex parts with good surface characteristics. In this process, in order to minimize the heat loss in [...] Read more.
Laser Powder Bed Fusion (L-PBF) is one of the most widespread, versatile, and promising metal Additive Manufacturing (AM) techniques. L-PBF allows for the manufacturing of geometrically complex parts with good surface characteristics. In this process, in order to minimize the heat loss in the first layers of printing, the building platform is preheated to a temperature ranging between 80 and 250 °C. This aspect turns out to be very critical, and further investigation is needed for situations where the part to be printed is only a few layers high, as is the case in sensor printing. This work aims to investigate the melt pool stability under a variation in the preheating temperatures. We investigate the distance from the building platform, considering the number of layers printed. This is where the melt pool reaches its stability in terms of depth and width. This aspect turns out to be of remarkable importance for ensuring the structural integrity of parts with a few layers of height that are processed through L-PBF, such as sensors, which are proliferating in different industries. Thus, two case studies were carried out on IN718 superalloys at 40 and 60 microns of layer thickness and a preheating temperature of 170 °C on the machine. The results obtained show that after 1.2 mm of distance from the building platform, the melt pool reached its stability in terms of width and depth dimensions and consequently for the melting regime. Full article
(This article belongs to the Special Issue Novel Research and Advanced Technology in Laser Welding and Laser Additive Manufacturing)
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18 pages, 6560 KiB  
Article
Wear and Corrosion Resistance of FeCoCrxNiAl High-Entropy Alloy Coatings Fabricated by Laser Cladding on Q345 Welded Joint
by Qiang Ben, Yumeng Zhang, Longxiang Sun, Leilei Wang, Yanni Wang and Xiaohong Zhan
Metals 2022, 12(9), 1428; https://doi.org/10.3390/met12091428 - 29 Aug 2022
Cited by 13 | Viewed by 2428
Abstract
High-entropy alloy (HEA) coatings on the surface of low-alloy steel by laser cladding can improve the corrosion and wear resistance, and the performance can be further improved by adding the Cr element. However, the effect of Cr content on the microstructure, hardness, wear [...] Read more.
High-entropy alloy (HEA) coatings on the surface of low-alloy steel by laser cladding can improve the corrosion and wear resistance, and the performance can be further improved by adding the Cr element. However, the effect of Cr content on the microstructure, hardness, wear and corrosion resistance of the coatings on the welded joint has not been completely understood in the literature. This paper aims at revealing the influence of Cr content on the microstructure and properties of laser-cladded FeCoCrxNiAl HEA on different regions of Q345 welded structure. The results indicate that FeCoCrxNiAl HEA coating has good metallurgical bonding with the Q345 welded surface. The increase of Cr element content in the powder plays an important role in energy absorption of powder and substrate, affecting the dilution rate and diffusion of Fe from the substrate to HEA coating. The HEA coating is mainly composed of the face-centered cubic phase (FCC) and body-centered cubic phase (BCC). When x = 1.5, the actual Cr element content of coating is the highest, which promotes the formation of hard brittle phase BCC, and subsequently affects the hardness and wear resistance of the sample. Meanwhile, the corrosion resistance increases and then decreases, and reaches the highest when x = 1.5. Due to the existence of Cr and other elements with good corrosion resistance in the HEA coating, a dense oxide film can be formed in 3.5 wt.% NaCl solution and neutral salt spray environment to prevent the corrosion from continuing, which can effectively improve the corrosion resistance of each region of the welded joint, and the protective efficiencies on the weld bead (WB), heat-affected zone (HAZ) and base metal (BM) are 99.1, 98.4 and 96.6%, respectively. Full article
(This article belongs to the Special Issue Novel Research and Advanced Technology in Laser Welding and Laser Additive Manufacturing)
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15 pages, 7881 KiB  
Article
Simulation of the Effect of Keyhole Instability on Porosity during the Deep Penetration Laser Welding Process
by Yue Kang, Yanqiu Zhao, Yue Li, Jianfeng Wang and Xiaohong Zhan
Metals 2022, 12(7), 1200; https://doi.org/10.3390/met12071200 - 14 Jul 2022
Cited by 8 | Viewed by 2952
Abstract
The quality of a laser deep penetration welding joint is closely related to porosity. However, the keyhole stability seriously affects the formation of porosity during the laser welding process. In this paper, a three-dimensional laser welding model with gas/liquid interface evolution characteristics is [...] Read more.
The quality of a laser deep penetration welding joint is closely related to porosity. However, the keyhole stability seriously affects the formation of porosity during the laser welding process. In this paper, a three-dimensional laser welding model with gas/liquid interface evolution characteristics is constructed based on the hydrodynamic interaction between the keyhole and molten pool during the laser welding process. The established model is used to simulate the flow and heat transfer process of molten. The Volume of Fluid (VOF) method is used to study the formation and collapse of the keyhole and the formation of bubbles. It is found that bubbles are easy to form when the keyhole depth abruptly changes. There are three main forms of bubbles formed by keyhole instability. The front wall of the keyhole collapses backward to form a bubble. The back wall of the keyhole inclines forward to form a bubble. The lower part of the keyhole produces a necking-down effect, and the lower part of the keyhole is isolated separately to form a bubble. In addition, when the keyhole does not penetrate the base metal, the stability of the keyhole is high and the percentage of porosity is low. Full article
(This article belongs to the Special Issue Novel Research and Advanced Technology in Laser Welding and Laser Additive Manufacturing)
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