The Influence of Heat Input on the Microstructure and Properties of Wire-Arc-Additive-Manufactured Al-Cu-Sn Alloy Deposits
Round 1
Reviewer 1 Report
Interesting and valuable article. However, the conclusions do not constitute a generalization of the results, but merely are a repetition of the test results. There is no relationship between the microstructure and the Al-Cu-Sn alloy deposits formed with different heat inputs by the WAAM 246 process.
Comments for author File: 
Comments.pdf
Author Response
Comments：Interesting and valuable article. However, the conclusions do not constitute a generalization of the results, but merely are a repetition of the test results. There is no relationship between the microstructure and the Al-Cu-Sn alloy deposits formed with different heat inputs by the WAAM 246 process. Response:Thanks to the reviewers for their valuable suggestions, I have revised the conclusion part of the article. (1)WAAM Al-Cu-Sn alloy deposits,as the heat input increases,size and number of pores is increased.The size of grains is increased.After solution treatment,the number of undissolved θ phases is increased.The number of θ，phases is decreased and phase spacing increased.When the heat input is greater than 90J / mm, pore size in the bulk material is greater than 50 μm, grains are mainly columnar grains in as-deposited state,after heat treatment, there are a large number of un-dissolved θ phases on the grain,distribution of θ，phases is sparse; (2) WAAM Al-Cu-Sn alloy deposits,as the heat input increases, the mechanical properties of the deposits decreases,when the heat input is greater than 90J/mm,the fracture characterization of this sample showed brittle fracture characteristics.
Author Response File: Author Response.pdf
Reviewer 2 Report
Minor formatting remarks: line 13 spaces are required before and after (WAAM) and ant line 15 extra space needs correction. (Scan the whole manuscript, there are numerous similar defects). line 17: omit the “the” each layer Figure 3: make the 200 μm scale visible I would like to see a cost balance in terms of power consumption for the different specimens regarding their actual manufacturing and post-processing heat treatment. This will provide a clear understanding of the manufacturing differences. Authors could benefit especially in the introductory section from the following references: Bikas, H., Stavropoulos, P., & Chryssolouris, G. (2016). Additive manufacturing methods and modelling approaches: a critical review. The International Journal of Advanced Manufacturing Technology, 83(1-4), 389-405. Stavropoulos, P., & Foteinopoulos, P. (2018). Modelling of additive manufacturing processes: a review and classification. Manufacturing Review, 5,Author Response
Comments1：line 13 spaces are required before and after (WAAM) and ant line 15 extra space needs correction. (Scan the whole manuscript, there are numerous similar defects). line 17: omit the “the” each layer。
Response1：Thanks to the reviewer's comments, I have corrected all the irregularities in the article.
Comments2： Figure 3: make the 200 μm scale visible。
Response2：The ruler in Figure 3 has been modified and is clearly visible.
Comment3：I would like to see a cost balance in terms of power consumption for the different specimens regarding their actual manufacturing and post-processing heat treatment. This will provide a clear understanding of the manufacturing differences.
Response3：The power consumption cost in actual manufacturing and post-processing has important value for the practical application of WAAM process. This paper studies the following organizations and performances of different heat transfers, and will focus on them in the following research.
（4）Comment4：Authors could benefit especially in the introductory section from the following references: Bikas, H., Stavropoulos, P., & Chryssolouris, G. (2016). Additive manufacturing methods and modelling approaches: a critical review. The International Journal of Advanced Manufacturing Technology, 83(1-4), 389-405. Stavropoulos, P., & Foteinopoulos, P. (2018). Modelling of additive manufacturing processes: a review and classification. Manufacturing Review, 5,
Response4:References recommended by reviewers describe the advantages and disadvantages of additive manufacturing, which is instructive to the foreword of this article and has been cited in the article. The additive manufacturing technology (AM) has the advantages of fast response speed[4],save raw materials[5]and other advantages,opening a new window for the production of Al-Cu alloy structural parts.
Author Response File: Author Response.pdf
Round 2
Reviewer 2 Report
Can be accepted in its current form
