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Special Issue "Study on the Microstructure and Mechanical Properties of Welding Alloys and Steels"

A special issue of Materials (ISSN 1996-1944). This special issue belongs to the section "Advanced Materials Characterization".

Deadline for manuscript submissions: 20 December 2023 | Viewed by 844

Special Issue Editors

Fraunhofer Institute for Nondestructive Testing IZFP, 66123 Saarbrücken, Germany
Interests: process monitoring and control; nondestructive evaluation (NDE); steels; material characterization; artificial intelligence
Fraunhofer Institute for Non-Destructive Testing IZFP, 66123 Saarbrücken, Germany
Interests: non-destructive testing (NDT); process monitoring; joining; welding; microstructure; mechanical properties
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Special Issue Information

Dear Colleagues,

Welding alloys and steels are widely used in a variety of industries and applications. The microstructure and mechanical properties of these materials are affected by the properties of the base material and the welding process itself. During welding, a material’s microstructure can be changed, which can have implications for the mechanical properties of the welded joint. For example, high-carbon steels are more prone to forming martensite, which can lead to reduced toughness. Nickel-based alloys are often used in high-temperature applications. However, they can be difficult to weld due to their high melting points and tendency to form brittle microstructures if not welded properly. These examples show that understanding the microstructure and mechanical properties of welding alloys and steels is crucial in producing high-quality welds. Overall, this is a broad and diverse field with many important research topics, such as welding process optimization, materials selection, material characterization, mechanical testing, weld defect analysis, as well as corrosion and wear resistance. Contributions to this Special Issue should address new findings in these research topics. The editors would especially appreciate papers that reference the application of nondestructive evaluation (NDE) and of artificial intelligence (AI) in welding.

Dr. Bernd Wolter
Dr. Benjamin Strass
Guest Editors

Manuscript Submission Information

Manuscripts should be submitted online at 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. Materials is an international peer-reviewed open access semimonthly 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.


  • alloys (welding)
  • artificial intelligence
  • steels
  • microstructure
  • mechanical properties

Published Papers (1 paper)

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Microstructure, Texture, and Mechanical Properties of Friction Stir Spot-Welded AA5052-H32: Influence of Tool Rotation Rate
Materials 2023, 16(9), 3423; - 27 Apr 2023
Cited by 1 | Viewed by 739
Friction stir spot welding (FSSW) of similar AA5052-H32 joints has numerous benefits in shipbuilding, aerospace, and automotive structural applications. In addition, studying the role of tool rotation speed on the microstructure features, achieved textures, and joint performance of the friction stir spot-welded (FSSWed) [...] Read more.
Friction stir spot welding (FSSW) of similar AA5052-H32 joints has numerous benefits in shipbuilding, aerospace, and automotive structural applications. In addition, studying the role of tool rotation speed on the microstructure features, achieved textures, and joint performance of the friction stir spot-welded (FSSWed) joint still needs more systematic research. Different FSSWed AA5052-H32 lap joints of 4 mm thickness were produced at different heat inputs using three tool rotation speeds of 1500, 1000, and 500 rpm at a constant dwell time of 2 s. The applied thermal heat inputs for achieving the FSSW processes were calculated. The produced joints were characterized by their appearance, macrostructures, microstructures, and mechanical properties (hardness contour maps and maximum tensile–shear load) at room temperature. The grain structure and texture developed for all the FSSWed joints were deeply investigated using an advanced electron backscattering diffraction (EBSD) technique and compared with the base material (BM). The main results showed that the average hardness value of the stir zone (SZ) in the welded joints is higher than that in the AA5052-H32 BM for all applied rotation speeds, and it decreases as the rotation speed increases from 500 to 1000 rpm. This SZ enhancement in hardness compared to the BM cold-rolled grain structure is caused by the high grain refining due to the dynamic recrystallization associated with the FSSW. The average grain size values of the stir zones are 11, 9, and 4 µm for the FSSWed joints processed at 1500, 1000, and 500 rpm, respectively, while the BM average grain size is 40 µm. The simple shear texture with B/-B components mainly dominates the texture. Compared to the welded joints, the joint processed at 500 rpm and a 2 s duration time attains the highest tensile-shear load value of 4330 N. This value decreases with increasing rotation speed to reach 2569 N at a rotation speed of 1500. After tensile testing of the FSSWed joints, the fracture surface was also examined and discussed. Full article
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