Numerical Analysis of the Welding Behaviors in Micro-Copper Bumps
Round 1
Reviewer 1 Report
Please see my comments.
Comments for author File: 
Comments.pdf
Author Response
Dear Reviewer,
Please see the attached file.
Thanks and Best,
Jian
Author Response File: Author Response.pdf
Reviewer 2 Report
1. Has the convective heat transfer effect been considered? If not, why?
2. Is the coefficient of friction between copper and copper considered? If not, why?
3. Since the FE model scale(micrometer) is small, it seems that the material properties depending on high-temperature should be considered for each material(Aluminum Pad, Passivation, Silicon) . In the case of copper, it is also necessary to consider the density and Poisson's ratio according to high-temperature.
4. A procedure is required to verify the simulation results.
- Comparison and verification after direct experiment under the same conditions
or
- Comparison and verification after the simulation is performed under the same conditions as previous reference materials containing similar types of experiment results
Author Response
Dear Reviewer,
Please see the attached file.
Thanks and Best,
Jian
Author Response File: Author Response.pdf
Reviewer 3 Report
The article reports the numerical simulation of a joint welded between copper by the ultrasonic friction process. Shows and describes results of von Mises stress values, strain, yielding strength and temperature reached during the process. This description is so exhausting that it is quite boring. In fact, the graphics presented show everything that is said afterwards in words - it is almost a repetition.
The main problem I encounter is that this simulation has no way of being verified experimentally, that is, I don't know if in physical reality this is really true.
The attached pdf contains other minor comments.
Comments for author File: Comments.pdf
Author Response
Dear Reviewer,
Please see the attached file.
Thanks and Best,
Jian
Author Response File: Author Response.pdf
Reviewer 4 Report
I would like to state that the Authors very logically and interestingly discuss results obtained in their research and the variability of process parameters. In my opinion the research work is very valuable.
Remarks:
Ad1) The temperature measurement units should be standardised (“K” or “OC”).
Ad2) What was amplitude of vibration?
Ad3) The Authors do not discuss place of attachment of the sonotrode and its shape and dimensions.
Ad4) What is the impact of the making of joint number 2 on the previously made welded joint (number 1). Have the authors analysed this aspect? Are the authors not afraid of destroying joint 1 (previous) when making the current one?
Ad5) Improving the parameter by 100 times is very valuable and interesting. However, such a result requires confirmation. Is it possible to confirm such a result experimentally?
Author Response
Dear Reviewer,
Please see the attached file.
Thanks and Best,
Jian
Author Response File: Author Response.pdf
Round 2
Reviewer 1 Report
Pease see my comments in an attached file.
Comments for author File: Comments.pdf
Author Response
Dear Reviewer,
Please see the attached file.
Thanks and Best,
Jian
Author Response File: Author Response.pdf
Reviewer 2 Report
Accept in present form.
Author Response
Dear Reviewer,
Please see the attached file.
Thanks and Best,
Jian
Author Response File: Author Response.pdf
