DESC:FORM 2
THE PATENTS ACT, 1970
(39 of 1970)
As amended by the Patents (Amendment) Act, 2005
&
The Patents Rules, 2003
As amended by the Patents (Amendment) Rules, 2016

COMPLETE SPECIFICATION
(See Section 10 and Rule 13)
TITLE
“TOOL FOR PREPARING FEED STOCK FOR FRICTION STIR ALLOYING”
APPLICANT
(a) Name : Mishra Dhatu Nigam Limited
(b) Nationality : Indian
(c) Address : PO Kanchanbagh, Hyderabad, Telangana – 500058, India

The following specification particularly describes the application and the manner in which it is to be performed.
PRIORITY STATEMENT
The present application hereby claims priority from Indian patent application with the application number 202341024808, filed on 31 March 2023, the entire contents of which are incorporated herein by reference.

TECHNICAL FIELD OF INVENTION
The present invention relates to a friction stir welding system. More particularly, the present invention relates to a tool for preparing feed stock for friction stir alloying.

BACKGROUND OF INVENTION
Composite materials are multifunctional materials having unique mechanical and physical properties that can be tailored to meet the requirements of a particular application. Aluminium based Metal Matrix Composites (MMC) always draw the attention of researchers due to its unique characteristics such as better strength to weight ratio, low wear rate and lower thermal expansion coefficient. There are various methods for manufacturing of MMC that can be grouped into two major categories: (a) Solid sate method such as powder metallurgy, co-extrusion and (b) Liquid state method such as stir casting. All of these methods for production of composites have their own advantages and disadvantages. Porosity, and poor wettabilty of dispersoids with matrix are few common problems in solid state route. Formations of undesirable phases, and segregation of dispersoids are common problems in liquid state processing route.
Friction stir welding (FSW) is a solid-state welding technique that was invented at The Welding Institute (TWI) in the UK in 1991. It is a process that involves joining two pieces of metal by using a rotating tool that heats and stirs the metal to be joined, without melting it. The frictional heat generated by the rotating tool softens the metal and allows it to be welded without melting.
Friction welding is hailed as the green welding technology of the future. Friction welding is a pressure welding method in which the heat generated by the friction of the workpiece is used as a heat source, and then two workpieces are bonded together by pressure to complete the welding. High-speed friction can make two objects tightly integrated. Friction welding is to forcibly bind different metals together and use pressure to tightly weld their contact areas. It reshapes under pressure.
Friction Stir Processing (FSP) technique, a derivative technique of Friction Stir Welding (FSW) has emerged as a major solid state technique to produce composites. However, there are several challenges associated with it. Most of the past work has been on limited volume of material. Researchers have tried to combine FSP technique with powder metallurgy technique to overcome aforementioned challenges associated with these techniques. Where on one hand, powder metallurgy ensures the uniform dispersion of dispersoids in the matrix, on the other hand FSP on sintered billet removes the pores and other defects. The combination of these two techniques leads to a more controlled and uniform properties. However, at the same time, it can be noted that the combination of these processes is tedious and time consuming.
Further, Friction Stir Processing is a solid-state processing technique wherein a non-consumable rotating tool extrudes the target material from the leading side and deposits the modified material at the trailing side of the tool. As a consequence of this, the material properties are enhanced due to either by grain refinement and surface alloying.
However, obtaining a uniform distribution of the alloying elements in the processed nugget remains a challenge. The current state of art in FSP is limited mostly to surface alloying. Several researchers used FSP technique on sintered billet made by power metallurgy route to improve the dispersion and bonding of a second phase. In an alternative approach, the second phase powders are filled in a groove on a base plate and dispersed into the matrix by carrying out the FSP along the groove line. However, the filled powder often comes out from the groove during processing, thereby, making the compositional control difficult. Moreover, the size of the stirred zone is limited in this approach.
In order to overcome the challenge of non-uniform mixing of alloying elements throughout the nugget without loss of powder during processing, a tool is proposed which ensure zero loss of powder during processing.

OBJECT OF THE INVENTION
The object of the present invention is to design a tool which ensure zero loss of powder during processing thereby preparing feed stock for Friction Stir Alloying.

SUMMARY OF THE INVENTION
The present invention discloses a friction stir alloying tool comprising a wheel located at a front end; and a wedge-shaped opening located at another end; wherein the tool is configured to move manually back and forth through the wheel, with the wheel rotating along its rotation axis, for uniformly placing filling powder inside a feedstock.

BRIEF DESCRIPTION OF THE DRAWINGS
These and other features, aspects, and advantages of the present disclosure will become better understood when the following detailed description is read with reference to the accompanying drawings in which like characters represent like parts throughout the drawings, wherein:
Fig. 1 illustrates schematic view of the present invention according to an embodiment of the present invention.
Further, skilled artisans will appreciate that elements in the drawings are illustrated for simplicity and may not have necessarily been drawn to scale. For example, the flow charts illustrate the method in terms of the most prominent steps involved to help to improve understanding of aspects of the present disclosure. Furthermore, in terms of the construction of the device, one or more components of the device may have been represented in the drawings by conventional symbols, and the drawings may show only those specific details that are pertinent to understanding the embodiment of the present disclosure so as not to obscure the drawings with details that will be readily apparent to those of ordinary skill in the art having the benefit of the description herein.

DETAILED DESCRIPTION OF THE INVENTION
For the purpose of promoting an understanding of the principles of the present disclosure, reference will now be made to the various embodiments and specific language will be used to describe the same. It will nevertheless be understood that no limitation of the scope of the present disclosure is thereby intended, such alterations and further modifications in the illustrated system, and such further applications of the principles of the present disclosure as illustrated therein being contemplated as would normally occur to one skilled in the art to which the present disclosure relates.
It will be understood by those skilled in the art that the foregoing general description and the following detailed description are explanatory of the present disclosure and are not intended to be restrictive thereof.
The present invention aims to overcome the limitations of prior art by providing a friction stir alloying tool that solves the problem of for uniform filling of the powder at groove site as well as powder loss
The present invention discloses a friction stir alloying tool 100 having a wheel (10) at front end and a wedge-shaped opening (20) at the other end.
In accordance with an embodiment of the present invention, the tool (100) is configured to move front and back manually through wheel (10); wherein the wheel is rotated along its rotation axis. The filling powder is uniformly placed inside the feed stock by moving the tool back and forth.
In accordance with an embodiment, the present invention provides a Friction Stir Processing tool used for uniform filling of the powder at groove site.
In accordance with the present invention, the rolling tool is passed through the groove section of the tubular workpiece wherein the powder is inserted for making the surface uniform prior to Friction Stir Alloying.
Example
A powder mixer of 40 atomic % of graphite with balance amount of aluminium was filled in a groove on commercially pure aluminium plate (99.9% pure). This composition was arrived at by maximizing the graphite content that can be consolidated in an aluminium matrix. During the experiment, it was found that a consolidation of the graphite powder alone in the aluminium matrix is not possible due to its lubricating properties. The amount of graphite should be reduced in the powder by mixing any metallic or non-metallic powder. The second powder should not have lubricating properties. Aluminium powder was selected in this case. The present invention is used to fill up the groove thereby addressing the challenges associated with the friction stir alloying by obtaining uniform dispersion of alloying additions as well as leaving no chance for graphite powder to spread out during handling and processing. Multi-layer Graphene (MLG) was found to be present in the process zone. Accordingly, the present invention plays a ke role in designing a low-cost method to produce graphene.
ADVANTAGES AND APPLICATION
An advantage of the present invention is that with the help of above tool, uniform distribution of the alloying elements in the processed nugget is achieved further lead to Friction Stir Alloying. ,CLAIMS:CLAIMS
We Claim
1. A friction stir alloying tool comprising:
a. a wheel located at a front end; and
b. a wedge-shaped opening located at another end;
wherein the tool is configured to move manually back and forth through the wheel, with the wheel rotating along its rotation axis, for uniformly placing filling powder inside a feedstock.
2. The friction stir alloying tool as claimed in claim 1, wherein the filling powder is uniformly placed inside the feedstock groove by moving the tool back and forth.