The cutting fluids are widely used to reduce the temperature and friction between the tool and work piece in the metal cutting processes. This work investigates the enhancement in the tribological properties of the mineral oil (MO) based cutting fluid with the inclusion of silver nanoparticles. The nano-cutting fluid was prepared by adding various proportions of silver nanoparticles in the mineral oil based cutting fluids. The extreme pressure properties and wear preventive characteristics of the nano-cutting fluid were assessed as per ASTM standard. The wear surfaces were analyzed using scanning electron microscopy and energy-dispersive spectroscopy. The inclusion of silver nanoparticles in the base fluid as additive shows a gradual reduction in the friction and wear. The influence of silver nanoparticles improved the load-wear index of the cutting fluid by 8 % and reduced the wear scar diameter by 13% .With reference to the empirical data, all the concentration of nanoparticles exhibit the improvement in the extreme pressure and anti-wear properties of the nano-cutting fluid. The formation of thin tribofilm containing silver nanoparticles at the wear surface is most likely mechanism behind the improvement in tribological behavior of mineral oil-based nano-cutting fluid.
This work presents a comparison between different techniques of shielding gas supply for commercially pure titanium grade-2(as per the AWS D10.6M) by using Gas Tungsten Arc Welding (GTAW) with respect to mechanical properties of weld metal and cost of welding processes. In this work, four type of shielding gases are used, that is pure argon, pure helium, premixed gases of (Ar+He) 75: 25% respectively and alternative gas supply of Argon and Helium. This technology of alternate supply of shielding gas improves every aspect of quality of arc welding. The dynamic motion (stir motion) take place in the weld pool due to various ionization properties of alternate gases supply. The technology of alternate shielding gas supply will improve the strength of the weld metal, welding speed, ductility and reduce crack, porosity, of the welding processes.
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