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Frictional Surfacing Seminar Report

Friction, which requires relative motion, pressure and time, is an efficient thermal energy source for the welding and reprocessing of materials. Friction based technology is now extensively used in industries,marine ,and aerospace. This paper will describe a friction based material processing technique called Friction Surfacing.

Surface engineering has become a relevant research field for manufacturing industries, as it enables advanced component design and a selective functionalization of surfaces. Solid state processing technologies are now mature and reliable alternatives to conventional processes. During the past decade the friction surfacing process has become well established with a number of commercial applications, and these are discussed at the end of this paper in the context of the current work. However, the existing models explaining the major relationships between process parameters are still generic. They are based on empirical rules and theoretical assumptions that account for a limited number of cases of current commercial interest. Many of these assumptions are implicit and have not been tested by using appropriate analysis and design of experiments.

Friction surfacing is a relatively new technology which is capable of producing coatings with zero dilution and good metallurgical bonding. This is attained because no melting is involved in this process. Friction surfacing is a solid state deposition process for producing wear and corrosion resistant coatings on metallic surfaces, which involves a rotating rod pushed against a horizontally moving plate. The rotating rod is the coating material and the plate is the substrate. Fig-1 shows a simple schematic diagram of friction surfacing process. The frictional heat generated during the process plasticizers the consumable rod. The plasticized metal gets deposited on to the substrate creating a relatively thick coating with good interfacial metallurgical bonding. The width of the coating depends on the diameter of the consumable rod and is normally in the range of 0.9 times the rod diameter.

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