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Open AccessArticlePost Publication Peer ReviewVersion 3, Approved

Railway Vehicle Wheel Restoration by Submerged Arc Welding and Its Characterization (Version 3, Approved)

1
Advanced Railroad Vehicle Division, Korea Railroad Research Institute, Uiwang-si 16105, Korea
2
Asia-Tech Co., Ltd., Jecheon-si 27159, Korea
*
Author to whom correspondence should be addressed.
Received: 11 April 2019 / Accepted: 12 April 2019 / Published: 14 May 2020
Peer review status: 2nd round review Read review reports

Reviewer 1 Jacek Tomków Gdańsk Universiity of Technology, Mechanical Department,Gabriela Narutowicza 11/1280-233 GdańskPoland Reviewer 2 Chao-Ming Hsu Department of Mechanical Engineering, National Kaohsiung University of Science and Technology Reviewer 3 Erjia Liu School of Mechanical & Aerospace Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore 639798, Singapore
Version 1
Original
Approved with revisions
Authors' response
Approved with revisions
Authors' response
Approved
Version 2
Revised
Approved Reviewer invited
Version 3
Approved
Version 3, Approved
Published: 14 May 2020
DOI: 10.3390/sci2020033
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Version 2, Revised
Published: 4 September 2019
DOI: 10.3390/sci1020052
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Version 1, Original
Published: 17 April 2019
DOI: 10.3390/sci1010025
Download Full-text PDF
When a railway vehicle moves on a curved rail, sliding contact occurs between the rail head side and wheel flange, which wears the wheel flange down. The thinned flange needs to be restored above the required minimum thickness for structural safety. In this study, a new process and welding wire for restoring worn-out railway wheels by submerged arc welding was developed. To characterize the properties of the restored wheel, dilatometric analysis of phase transformation, SEM/EDX analyses, hardness measurement, and residual stress measurement using the X-ray diffraction method were performed. Finally, wear tests with full-size wheel/rail specimens were carried out. It was confirmed that the weld metal was composed of bainitic microstructures as intended, and welding defects were not observed. The wear amount of the restored wheel was greater than that of the base material, but it was less than half of the wear depth of the weld-repaired wheel with ferritic–pearlitic microstructures. The developed process seems applicable to industry. View Full-Text
Keywords: bainite; submerged arc welding; hardfacing; reprofiling; railway wheel; wear bainite; submerged arc welding; hardfacing; reprofiling; railway wheel; wear
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MDPI and ACS Style

Coo, B.-C.; Lee, Y.-J. Railway Vehicle Wheel Restoration by Submerged Arc Welding and Its Characterization. Sci 2020, 2, 33.

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1

Reviewer 1

Sent on 09 Aug 2019 by Jacek Tomków | Approved with revisions
Gdańsk Universiity of Technology, Mechanical Department,Gabriela Narutowicza 11/1280-233 GdańskPoland

Dear Authors,

In my opinion your paper presents valuable experiments and results. However, I have some suggestions. My proposition: minor revision.

The "Introduction" presents good background for prepared experiments. In "Materials and Methods" all important information are presented.

I have one question in this field.
In this paragraph, I can find that "Overlay-welded wheels have to satisfy basic properties such as hardness, mechanical strength, fracture toughness, elongation rate, wear resistance, etc." - could you present these properties? The carbon content in wheel (0.67%) and in your wire (0.06%) are much different. This content has important role in properties of the material. Please add comment in this area.

Please also add information how many specimens have your tested in each test. Have you prepared any statistical analysis?

I propose to change images in Figure 12. Now they look different (font in axis, the quality etc.). In my opinion is should look similar.

You shouls change Figure 13. The quality is very poor, in my opinion it should be placed straight in the text not as a scan.

Response to Reviewer 1

Sent on 11 Jul 2020 by Byeong-Choon Goo, Young-Jin Kim

In my opinion your paper presents valuable experiments and results. However, I have some suggestions. My proposition: minor revision. The "Introduction" presents good background for prepared experiments. In "Materials and Methods" all important information are presented. I have one question in this field. In this paragraph, I can find that "Overlay-welded wheels have to satisfy basic properties such as hardness, mechanical strength, fracture toughness, elongation rate, wear resistance, etc." - could you present these properties? The carbon content in wheel (0.67%) and in your wire (0.06%) are much different. This content has important role in properties of the material. Please add comment in this area. ==> To prevent cracks that may occur during welding or after welding is one of the key technologies for re-manufacturing of worn wheels. And overlay-welded wheels have to satisfy basic properties. To solve these problems, several candidate materials have been tried. After various tests for the candidate materials, the composition in the document was chosen. Please also add information how many specimens have your tested in each test. Have you prepared any statistical analysis? ==> We did not do statistical analysis. In EN standard, arithmetic mean values are used. We also used mean values. I propose to change images in Figure 12. Now they look different (font in axis, the quality etc.). In my opinion is should look similar. ==> Figures were drawn again. You should change Figure 13. The quality is very poor, in my opinion it should be placed straight in the text not as a scan. ==> Unfortunately, the measuring device is an old device, so only the picture is printed and raw data is not printed.

Reviewer 2

Sent on 06 May 2019 by Chao-Ming Hsu | Approved with revisions
Department of Mechanical Engineering, National Kaohsiung University of Science and Technology

This article has a smooth writing and complete article structure. I recommend to accept this article.

Response to Reviewer 2

Sent on 11 Jul 2020 by Byeong-Choon Goo, Young-Jin Kim

Thank you very much for reviewing my document.

Reviewer 3

Sent on 13 Apr 2020 by Erjia Liu | Approved
School of Mechanical & Aerospace Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore 639798, Singapore

Authors have addressed most points raised by the reviewers.

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