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Metals
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Laser Welding of Metals and Alloys
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Laser Welding of Metals and Alloys

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

Deadline for manuscript submissions: closed (30 September 2021) | Viewed by 5506

Special Issue Editor

Dr. Matija Jezeršek

E-Mail Website
Guest Editor
Laboratory for Laser Techniques, Faculty of Mechanical Engineering, University of Ljubljana, Ljubljana, Slovenia
Interests: laser welding; laser material processing; laser ablation; adaptive control of process parameters
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

Laser welding of metals and alloys is becoming an important technology due to its ultimate properties, such as focusing of high power laser beam to a small area and almost zero mass of the welding tool, which results in fast and flexible movement of the laser beam along the welding path. The technology is emerging where welding of thin sections, minimal heat affected zone, high welding speed, and minimization of thermomechanical distortions are expected. In addition, development of new materials with improved mechanical and chemical properties must also be supported with research and development of innovative welding technologies. Advanced laser sources with integrated sensors for process monitoring offer opportunities for weld quality improvement, shortening the system preparation times and increasing the production rates based on higher power and automatic control of working parameters.

It is my pleasure to invite you to submit a manuscript to this Special Issue. The issue shall cover recent progress in basic and applicative research and development of laser welding processes. The topics of interest include but are not limited to laser welding of similar and dissimilar metal alloys, modeling and simulation of influences of working parameters to mechanical properties and microstructure, process monitoring, and real-time control of laser welding processes. Full papers, communications, and reviews are all welcome.

Prof. Dr. Matija Jezeršek
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

  • laser welding
  • welding of dissimilar materials
  • experimental and simulations studies of laser welding
  • process optimization
  • process monitoring and control
  • weld microstructure and properties

Published Papers (2 papers)

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Research

13 pages, 10684 KiB  
Article
The Dilution Effect in High-Power Disk Laser Welding the Steel Plate Using a Nickel-Based Filler Wire
by Ming-Feng Chiang, Tzu-Yuan Lo, Ping-Hui Chien, Chih-Hsien Chi, Kai-Chun Chang, An-Chou Yeh and Ren-Kae Shiue
Metals 2021, 11(6), 874; https://doi.org/10.3390/met11060874 - 27 May 2021
Cited by 3 | Viewed by 1674
Abstract
High-power disk laser welding a steel plate using the Inconel 82 (IN82) filler wire with a 1.2 and 3.0 m/min feeding rate has been investigated in the experiment. The rapid thermal cycle combined with convection induced by the keyhole mechanism in laser welding [...] Read more.
High-power disk laser welding a steel plate using the Inconel 82 (IN82) filler wire with a 1.2 and 3.0 m/min feeding rate has been investigated in the experiment. The rapid thermal cycle combined with convection induced by the keyhole mechanism in laser welding results in the rapid solidification of the fusion zone (FZ). However, the microstructure of the FZ is not homogeneous at the macroscopic scale. The dilution of the FZ is important in determining the final microstructure of the weldment. For the specimen with a 1.2 m/min wire feeding rate, a lower amount of Ni-based IN82 filler is introduced into the weld pool, and the dilution of the FZ is between 65% and 100%. The BCC structure with high density boundaries dominates the entire FZ. For the specimen with a 3.0 m/min wire feeding rate, part of the filler melt is trapped on the top of the weld pool, and solidified into austenite alloyed with a Ni concentration above 15 at%. The range of dilution in the FZ with a 3.0 m/min wire feeding rate is decreased to 50–90%. There are hot cracks initiated/propagated along interdendritic austenite and in the austenite free of boundaries. Boundaries, especially for high-angle ones, in the BCC structure retard hot crack propagation in the FZ. The application of quantitative chemical analyses of Fe or Ni concentrations in the weldment provides a good approximation in evaluating the dilution of the FZ in laser welding. The methodology proposed in this study shows potential to obtain the dilution of any specific location in the FZ for industrial application in the future. Full article
(This article belongs to the Special Issue Laser Welding of Metals and Alloys)
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14 pages, 39459 KiB  
Article
Laser Welding of Grey Cast Iron with Spheroidal Graphite-Influence of Process Parameters on Crack Formation and Hardness
by Niklas Sommer, John Michael Lehto, Stephan Völkers and Stefan Böhm
Metals 2021, 11(4), 532; https://doi.org/10.3390/met11040532 - 24 Mar 2021
Cited by 4 | Viewed by 3288
Abstract
In the investigation at hand, sheets of ferritic and pearlitic grey cast iron with spheroidal graphite are welded using a fiber-laser. The influence of varying laser power and welding speed on the macroscopic characteristics of the weld seam and crack formation are analyzed [...] Read more.
In the investigation at hand, sheets of ferritic and pearlitic grey cast iron with spheroidal graphite are welded using a fiber-laser. The influence of varying laser power and welding speed on the macroscopic characteristics of the weld seam and crack formation are analyzed and discussed. Substantial crack formation with crack densities of up to 2.93 cm−1 are found. Furthermore, hardness measurements are conducted to evaluate the formation of brittle phases within the weld metal and heat-affected zone. Peak hardness values of up to 860 HV0.3 and 975 HV0.3 are identified in EN-GJS-400-15 and EN-GJS-700-2, respectively. Subsequently, a proposition on the dependence of crack formation on weld seam width is given. Furthermore, the influence of nickel-containing filler material on the microstructure, crack formation and hardness is studied. It can be derived from the results that laser-beam welding of grey cast iron with spheroidal graphite requires further research in order to achieve crack-free weld seams and hinder the formation of undesirable, brittle phases. Full article
(This article belongs to the Special Issue Laser Welding of Metals and Alloys)
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