The Dilution Effect in High-Power Disk Laser Welding the Steel Plate Using a Nickel-Based Filler Wire

Round 1

Reviewer 1 Report

Dear Authors,

I have reviewed paper titled "The Dilution Effect in High-Power Disk Laser Welding the Steel Strip Using a Nickel-Based Filler Wire".

The paper fulfills the aims and scope of Metals journal. It could be considered for publishing after some improvements. My suggestions are listed below.

General remarks:

• Your list of references is very short. It should be seriously extnded by newly published articles (since 2019). It will increase the visibility of your paper in scientific databases.

Introduction:

• This part is very short. Many important information are not described.
• Please describe the usage of investigated materials.
• No informations about dilution are presented here. You should describe, why dilution is important. Which factors are changed with different values of dilution. Without these information, you will not show the relevant scientific background for your investigations.
• The novelty of your work should be underlined more deeply.

Material and experimental procedures:

• This section is very weak.
• Line 62 - why you have used these parameters? It should be stated in the paper.
• What does it mean "steel strip"? The grade of used materials should be clearly stated.
• The chemical composition of filer material should be presented. Moreover, the mechanical properties of steel and filer material should be presented. It will prove that you have chosen proper materials.
• What was the dimensions of used "steel strip"? How many specimens have you performed? This have to be presented in the paper.
• Have you used any reuirements from standards during performed tests? If yes, please give these standards' numbers. If no, you should describe, why.
• "a load of 200 g for duration time of 10 s" - please name the Vickers scale.

Results and Discussion:

• I cannot find any scientific discussion in your paper. You have not compared and discussed your results with results presented in scientific papers. In this state, the paper looks like technical report.
• Please prove presented values of dilution. Moreover, you should compare them with dilution calculated by graphical method. I cannot agree, that in laser welding it is very hard to calculate these values.
• Please show the macroscopic photos of your specimen.
• Table 1 - it is not clear, what doues in mean "Locatin A...". Please show the schematic draw with these locations. Moreover, please discuss why dilution is different in different locations. Now it is not clear.

Conclusions:

• Support conclusions with values from tests.

Author Response

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Author Response File: Author Response.pdf

Reviewer 2 Report

The use of laser welding of cold-rolled strips in cold-rolling technological streams is known as one of the most modern and promising methods of metals joining. The quality of the welded joint has a huge impact on the stability of the technological process in the conditions of continuous units. If a welded strip with a poor-quality welded joint is sent into the line of the unit, then a fracture in the welded zone and a complete long stop of the line may occur until the strip is removed.

In this regard, a laser welding technology is needed that would ensure a guaranteed stable quality of the welded joint in a sufficiently wide range of modes, and would also make it possible to ship metal products to the consumer with a welded joint. Therefore, the research results summarized in the article are relevant.

1. The Introduction of the article is very short. I propose to analyze the latest publications of this scientific direction:

Viňáš, J.; Brezinová, J.; Sailer, H.; Brezina, J.; Sahul, M.; Maruschak, P.; Prentkovskis, O. Properties Evaluation of the Welded Joints Made by Disk Laser, Materials 2021, 14, 2002, https://doi.org/10.3390/ma14082002

Viňáš, J., Brezinová, J., Brezina, J., P.O. Maruschak Structural and Mechanical Features of Laser-Welded Joints of Zinc-Coated Advanced Steel Sheets, Mater Sci, 2019, 55, 46-51, https://doi.org/10.1007/s11003-019-00250-x

Geng, Y., Konovalov, S.V., Chen, X. Research status and application of the high-entropy and traditional alloys fabricated via the laser cladding (2020) Progress in Physics of Metals, 21 (1), pp. 26-45. DOI: 10.15407/ufm.21.01.026

Sisodia, R.P.S., Gáspár, M. Investigation of Metallurgical and Mechanical Properties of Laser Beam Welded and Post-weld Heat Treated DP1400 Steel. J. of Materi Eng and Perform 30, 1703–1710 (2021). DOI: 10.1007/s11665-021-05469-x

Konovalov, S., Osintsev, K., Golubeva, A., Smelov, V., Ivanov, Y., Chen, X., Komissarova, I. Surface modification of Ti-based alloy by selective laser melting of Ni-based superalloy powder (2020) Journal of Materials Research and Technology, 9 (4), pp. 8796-8807.  DOI: 10.1016/j.jmrt.2020.06.016

Mostaan, H., Shamanian, M., Moradi, R. et al. Correction to: Weld Zone Characterization of Dissimilar SS UNS S43000/UNS S32304 Joined through Laser Beam Welding: EBSD Study, Phase Evolutions, and Fractography. J. of Materi Eng and Perform 30, 822 (2021). https://doi.org/10.1007/s11665-020-05410-8

2. On the basis of which standards (or technological instructions) were selected the main spatial and energy parameters of laser welding, which reduce the length of the recrystallization zone and improve the quality of welded joints?
3. The technological laser welds must ensure uninterrupted transportation of the strip through many bending sections of the lines of continuous units at significant travel speeds (180-200 m / min), therefore, it must have high strength. Has strength of welds been investigated?
4. In fig. 1, 3-7 show the microstructural components of the welds. I propose to show examples of several welds at macro images.
5. In strip’s laser welding surface has, as a rule, 2 local minimum and a maximum in height. What is the surface roughness of the examined joints? It is necessary to carry out 3-D profilometry of several welded zones.
6. Reference [6] must be shown in view: Kozhevnikov, A.V., Smirnov, A.S., Kozhevnikova, I.A.; Antonov, P.V.; Zhilenko, S.V.; Aralov, A.I. Investigation of Self-Oscillations and the Development of a Procedure of Stabilization of the Process in a Continuous Mill for Strip Cold Rolling. Metallurgist 64, 770–779 (2020). https://doi.org/10.1007/s11015-020-01053-1

The title of the article is missing from the authors' version now.

7. The main problems of on-line detection of welding position are low signal level of welded part and large signals from strip surface itself. If the circular focused laser beam was used, large continuous noises caused by microscopic structure (roughness) of strip surface can influence on reflection direction, and focused laser. How was this issue resolved in this study?
8. At the continuous movement of the strip along the unit at significant speeds (180-200 m / min), there is practically no margin of time for additional welding in case of unsatisfactory quality of the weld. Can strip condition monitoring detect defective weld joints? For example, based on CNN?
9. How the positioning accuracy of the strip ends was controlled.
10. It is necessary to indicate the chemical composition of the welded wire.
11. How the surface preparation of the strips was carried out at the place of scraping (degreasing, cleaning)
12. (68), (122) 73.76% nickel is indicated. This is impossible for steel.
13. In the chemical composition of steel 20% Cr, and in table 1, in the weld, it is indicated from 2.2% to 5.0%. Why is there such a big difference?

Author Response

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Author Response File: Author Response.pdf

Round 2

Reviewer 1 Report

Dear Authors,

Thank you for your response. Paper has been improved a lot - your efforts are appritiate. I suggest minor revision.

• Line 40 - "Kozhevnikov et.al. did a nice work" - please use academic english and scientific phrases. "Did a nice work" is not suitable to scientific paper.
• There is no information about sources of presented chemical compositions - anaysis, manufacturer data or standard? Please mark this in the text.
• Still, you have not discussed your paper well. Lines 310-322 do not include any comments to other references. You should compare your results with other scientists.

 

Author Response

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Reviewer 2 Report

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Author Response

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Round 3

Reviewer 2 Report

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Author Response

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