Special Issue "Welding of Steels"

A special issue of Applied Sciences (ISSN 2076-3417). This special issue belongs to the section "Mechanical Engineering".

Deadline for manuscript submissions: 15 January 2019

Special Issue Editors

Guest Editor
Prof. Lars-Erik Svensson

Dept of Engineering Science,University West,SE-46186 Trollhättan,Sweden
E-Mail
Interests: material and physical aspects of welding of steels
Guest Editor
Prof. Dr. Leif Karlsson

Dept of Engineering Science, University West, SE-46186 Trollhättan, Sweden
Website | E-Mail
Interests: material and physical aspects of welding of steels

Special Issue Information

Dear Colleagues,

Steels are still an undisputable material for many of constructions made today. Both stainless and ordinary C-Mn steels have developed significantly over the last few years, as a response to new demands for strength, corrosion resistance, etc., for a more sustainable future. However, to make effective use of these steels, they need to be weldable. This Special Issue will deal with welding of modern steels, both newer steels and application of new welding techniques for the lower strength levels as well as new very high strength steels. It will also cover welding of stainless steels, with its multitude of alloys.

Significant research is going on around the world about welding of these new steels, in terms of steel design, consumable design and welding techniques, which need to be highlighted. Papers on experimental investigations as well as numerical analyses are welcome to illustrate the progress made within this field.

Prof. Lars-Erik Svensson
Prof. Dr. Leif Karlsson
Guest Editors

Manuscript Submission Information

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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. Applied Sciences 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 1400 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
  • High strength steels
  • Stainless steels
  • New alloys
  • Metallurgy
  • Welding techniques

Published Papers (3 papers)

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Research

Open AccessArticle Enhancement of Exit Flow Uniformity by Modifying the Shape of a Gas Torch to Obtain a Uniform Temperature Distribution on a Steel Plate during Preheating
Appl. Sci. 2018, 8(11), 2197; https://doi.org/10.3390/app8112197
Received: 14 October 2018 / Revised: 31 October 2018 / Accepted: 6 November 2018 / Published: 9 November 2018
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Abstract
The objective of this study is to improve the exit flow uniformity of a gas torch with multiple exit holes for effective heating of a steel plate. The torch was simulated, and combustion experiments were performed for validation. Based on a basic model,
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The objective of this study is to improve the exit flow uniformity of a gas torch with multiple exit holes for effective heating of a steel plate. The torch was simulated, and combustion experiments were performed for validation. Based on a basic model, three different revised models were designed and analyzed with the software ANSYS FLUENT 18.2. The flow uniformity (γ) of the velocity distribution at the multiple exit holes was investigated with the pressure drop ranging from 100 to 500 Pa. The basic model had flow uniformity ranging from 0.849 to 0.852, but the three new models had γ1 = 0.901–0.912, γ2 = 0.902–0.911, and γ3 = 0.901–0.914, respectively. The maximum percentage difference of the flow uniformity index between the three new models and the basic model was 7.3%. The basic model with nonuniform flow distribution made a temperature difference of the back side of the steel plate from the center to the edge of around 229 °C, while the modified model with uniform flow distribution had a smaller temperature difference of 90 °C. The simulation results showed good agreement with our experimental results for both the basic model and the modified model. The modified gas torch made a wider and more uniform temperature distribution on a preheated steel plate than the basic one. The results revealed that a trade-off between cost and flow uniformity, as well as the new gas torch, could be applied to a steel-plate preheating process before welding. Full article
(This article belongs to the Special Issue Welding of Steels)
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Open AccessArticle High-Speed Welding of Stainless Steel with Additional Compensatory Gas Jet Blow Molten Pool
Appl. Sci. 2018, 8(11), 2170; https://doi.org/10.3390/app8112170
Received: 26 September 2018 / Revised: 31 October 2018 / Accepted: 2 November 2018 / Published: 6 November 2018
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Abstract
To avoid humping bead defects in high-speed welding, this paper proposes the method of an additional and compensatory gas jet blow molten pool. A pulsed metal inert gas high-speed welding test platform was constructed for compensatory gas jet blow molten pool. A total
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To avoid humping bead defects in high-speed welding, this paper proposes the method of an additional and compensatory gas jet blow molten pool. A pulsed metal inert gas high-speed welding test platform was constructed for compensatory gas jet blow molten pool. A total of 304 stainless steel sheets were used as the welding workpieces under equal heat inputs. Two high-speed butt welding processes were conducted and compared, in which the workpieces were welded with and without compensatory gas jets at 154 cm/min and 167 cm/min, respectively. After high-speed welding with compensatory gas jet blow, the weld appearance was straight, uniform, and high-quality, with no humping bead or undercut defects. The macroscopic morphologies and microstructures of cross-sections of the weld at the toe, near the surface, the middle, and the bottom portion all showed the stirring effect of the gas jet on the molten pool and improved grain refinement degrees. Hardness was enhanced in the weld center and the heat-affected zone. At welding speeds of 154 cm/min and 167 cm/min, the fracture load capacities of the welds were increased by 24.9 and 10.4%, respectively. Full article
(This article belongs to the Special Issue Welding of Steels)
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Open AccessArticle Effect of Additional Shielding Gas on Welding Seam Formation during Twin Wire DP-MIG High-Speed Welding
Appl. Sci. 2018, 8(9), 1658; https://doi.org/10.3390/app8091658
Received: 4 August 2018 / Revised: 3 September 2018 / Accepted: 10 September 2018 / Published: 14 September 2018
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Abstract
For diminishing welding defects such as incomplete penetration, which may easily occur during the twin wire Double Pulsed Metal Inert Gas (DP-MIG) high-speed welding, a novel method using additional shielding gas is introduced in this paper. A branch for the additional shielding gas
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For diminishing welding defects such as incomplete penetration, which may easily occur during the twin wire Double Pulsed Metal Inert Gas (DP-MIG) high-speed welding, a novel method using additional shielding gas is introduced in this paper. A branch for the additional shielding gas was specially set near the back end of the protection hood for the DP-MIG nozzle. The constructed gas branch was used for enabling manual intervention in the formation of a high-temperature solid–liquid weld seam just emerging from the nozzle and also for secondary gas protection on the surface of the weld seam. The butt welding test was carried out in the 2205 duplex stainless steel plate and the weld seam was then characterized by a tensile test, metallographic analysis, X-ray non-destructive testing (NDT), hardness analysis, and impact test. The results showed that the introduction of an appropriate amount of additional shielding gas can effectively improve and diminish the unfused weld seam and also improve the mechanical properties such as the tensile properties of the weld joint, the hardness and toughness of the weld joints. Therefore, the introduction of additional shielding gas has further research potential in theory and process practice. Full article
(This article belongs to the Special Issue Welding of Steels)
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