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Metals
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Laser Welding and Welding Joint Quality Assessment - State of...
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Laser Welding and Welding Joint Quality Assessment - State of Art

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 2022) | Viewed by 3920

Special Issue Editor

Prof. Dr. Milton Sergio Fernandes de Lima

E-Mail Website
Guest Editor
Institute for Advanced Studies, Sao Jose dos Campos, Brazil
Interests: synthesis and laser processing of materials; photonics; physical metallurgy and the processing of advanced materials through high-power laser methods
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

The world is undergoing significant changes in its work and employment relationships, and photonic technologies are increasingly important in this world of new opportunities. Among the Key Enabling Technologies for the future, we can highlight new materials and advanced manufacturing techniques, which allow the integration to IoT, augmented reality and AI. Processes using industrial lasers (e.g., cutting, welding, surface treatments and additive manufacturing) are particularly favorable in this new context. This Special Issue intends to contribute to the state of the art in Laser Welding and Welding Joint Quality Assessment in order to become a reference in the area. The proposed themes include but are not limited to:

  • Phenomena involved in laser welding (LBW);
  • Comparative analysis between LBW and other techniques;
  • Quality and qualification of laser welding;
  • Development of alternative joining techniques with laser beams;
  • Microstructural, mechanical and chemical characterization of LBW joints;
  • Welding of advanced materials and new techniques in conventional materials;
  • New frontiers in LBW;
  • Case studies, including well-described industrial applications;
  • Sustainability of LBW processes;
  • LBW in the green economy.

Certainly, the publication of your article in a collection of texts with high relevance today will help in our ongoing mission of scientific and technological dissemination for future generations.

Prof. Dr. Milton Sergio Fernandes de Lima
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 beam welding
  • laser technologies
  • quality assessment

Published Papers (2 papers)

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Research

10 pages, 12679 KiB  
Article
Laser Beam Welding of CubeSat 1U Structure Parts Obtained by Powder Bed Fusion
by Rafael Humberto Mota de Siqueira, Diego Javier Celentano and Milton Sergio Fernandes de Lima
Metals 2022, 12(11), 1992; https://doi.org/10.3390/met12111992 - 21 Nov 2022
Viewed by 1268
Abstract
This study contributes to a possible methodology for manufacturing CubeSats using additive manufacturing and laser beam welding. Titanium connectors were constructed by selective laser melting and electron beam melting and characterized from a topological point of view. The connectors can be joined to [...] Read more.
This study contributes to a possible methodology for manufacturing CubeSats using additive manufacturing and laser beam welding. Titanium connectors were constructed by selective laser melting and electron beam melting and characterized from a topological point of view. The connectors can be joined to titanium tubes for the construction of CubeSats via laser spot welding. The fiber laser welds exhibited full penetration using pulses with 400 J of energy. The welds showed titanium acicular martensite grains with recesses and pores. The average hardness of the cast zone was 350 HV, which is close to the hardness of the connectors (400 HV) and more rigid than that of the tubes (100 HV). Spot welding has proven to be useful in resisting forces above 2000 N, which is sufficient for CubeSat frame space applications. Full article
(This article belongs to the Special Issue Laser Welding and Welding Joint Quality Assessment - State of Art)
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13 pages, 29906 KiB  
Article
Improvements in the Microstructure and Mechanical Properties of Aluminium Alloys Using Ultrasonic-Assisted Laser Welding
by Ahmed Teyeb, João Silva, Jamil Kanfoud, Phil Carr, Tat-Hean Gan and Wamadeva Balachandran
Metals 2022, 12(6), 1041; https://doi.org/10.3390/met12061041 - 17 Jun 2022
Cited by 6 | Viewed by 2150
Abstract
Welding high-strength aluminium alloys is generally a delicate operation due to the degradation of mechanical properties in the thermally affected zone (TAZ) and the presence of porosities in the molten metal. Furthermore, aluminium alloys contain compounds that solidify before the rest of the [...] Read more.
Welding high-strength aluminium alloys is generally a delicate operation due to the degradation of mechanical properties in the thermally affected zone (TAZ) and the presence of porosities in the molten metal. Furthermore, aluminium alloys contain compounds that solidify before the rest of the base alloy, therefore acting as stress concentration points that lead to the phenomenon of hot cracking. This paper investigates the process of applying ultrasonic vibrations to the molten pool aluminium alloy AA6082 to improve both its microstructure and mechanical properties. We analysed conventional and ultrasonic-assisted laser welding processes to assess the sonication effect in the ultrasonic band 20–40 kHz. Destructive and nondestructive tests were used to compare ultrasonically processed samples to baseline samples. We achieved a 26% increase in the tensile and weld yield strengths of laser welds in the aluminium plates via the power ultrasonic irradiation of the welds under optimum ultrasonic variable values during welding. It is estimated that the ultrasound intensity in the weld melt, using a maximum power of 160 W from a pair of 28 kHz transducers, was 35.5 W/cm2 as a spatial average and 142 W/cm2 at the antinodes. Cavitation activity was significant and sometimes a main contributor to the achieved improvements in weld quality. Full article
(This article belongs to the Special Issue Laser Welding and Welding Joint Quality Assessment - State of Art)
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