FSW of dissimilar alloys or materials having various defects, therefore by doing FSP on FSW will it make helpful?
Please suggest advantages and disadvantage of above mentioned technique along with field of applications.
Both are same , So it can be double pass FSW. its basically an increase in pass number. Parameter of FSW should be selected such that sound joint can be achieved.
Yes, it could be useful; bonding between disimilar fsw joints is kind of metallurgycal and mechanical, metallurgical bonding is formed by formation of intermetalic componds (IMC) between to dissimillar BM, coarse IMC could be cause the weak joint. therefore using fsp after fsw, fragmentes the IMC and modifys microstructure of weld joint (Stir Zone) that helps to increasing mechanical properties. Also fsp as a thermomechanical process, could be remove defects (discontiniuty/void) from the stir zone.
I hope its useful.
As above mentioned, FSP specially by adding Ceramic reinforcements can improve the grain refinement and so, mechanical, microstructural and tribological properties of of friction stir welded materials.
However, in some cases such as in material which are sensitive to thermal variations, FSP after FSW can enlarge the HAZ.
In my idea, using FSP with optimized parameters is important.
@Ali Moharami
Thank you for the inputs.
As FSP tool is going to insert in weld zone with diffetent doping techniques.
With HAZ, hope to have large width of SZ too for dispersion of reinforcements and defect free samples.
Kindly see :
Harshadkumar H. Jadav, Vishvesh Badheka, Daulat Kumar Sharma, Gautam Upadhyay, A review on effect of friction stir processing on the welded joints,
Materials Today: Proceedings,Volume 43, Part 1,2021,Pages 84-92,
ISSN 2214-7853, https://doi.org/10.1016/j.matpr.2020.11.215.
Roshan Vijay Marode, yes reinforcement FSP can be done on FSW joints. Certain metals having higher thermal conductivity such as Cu in which, it will be difficult to retain the mechanical properties and microstructure just after the Friction Stir Welding, and to improve the mechanical properties by addition of reinforcement particles it can be done. In fact, this can be the solution for many applications if the results will be satisfactory. Or Depending upon the application and the requirement it can be done. The second thing FSW can not improve the wear resistance in that case also this kind of FSP can be employed. As far as dissimilar metal joining is concerned, Certainly this kind of FSP can be done which can provide metallurgical compatibility in the joints like for Cu to SS FSW, one can add Ni particles which are having compatibility with steel and Cu both respectively, Using the Ni powder the properties of Cu HAZ can also be improved using FSP. THIS IS JUST MY OPINION but I certainly favor this type of processing of FSW joints.
FSW of dissimilar materials could be challenging at some points. One may come from the formation of intermetallic compounds which mostly compromise the quality of material in sever condition. So the post-processing treatment may be required. An optimized FSP as extra pass is able to modify the microstructure by different mechanisms such as grain refining (especially for those intermetallic compounds to make their effectiveness less) and etc. in the case of using reinforcement particles (depending on their initial shapes) in the weld zone, an un-optimized FSP can nullify the strengthening effects of reinforcement particles, therefore, a decrease in mechanical properties.
Usually, FSP is used to allow controlled surface depths to be altered, microstructural alteration of the processed material and it can improve some of the material cast defects such as bubbles or voids.
For more and accurate information please check this following work:
https://link.springer.com/referenceworkentry/10.1007%2F978-3-319-01815-7_51
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