Welding of ferritic steel tube material T91 (9Cr-1Mo), was used because of high temperature withstanding, mechanical properties, compatibility with chemicals and adequate weldability. The main objective of this project is to find out near optimum welding parameters with appropriate shielding gas in gas tungsten inert gas welding (GTAW) of T91 tube. The quality and productivity of the weld joint strongly depends on welding parameters. The perfect arc during welding is produced when the welder uses the optimum welding parameters. The composition of shielding gas plays an important role ensuring sound quality of welds. The composition of shielding gas with the molten pool has a marginal influence in the depth of penetration. The optimized parameters with three samples were prepared with different purging gases Viz. 100% helium, 100% Argon, Argon 50% plus Helium 50% for welding of 2.9 mm thick T91 tube with ER 505 filler wire.

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Aluminium alloys are widely used in automotive, aerospace and ship industries as high strength-to-weight ratio materials. With the increasing demand for lightweight components, their application is becoming more extensive. To study the effect of Tool geometries on Metallurgical & mechanical properties of Aluminum alloy 5052 H32 using friction stir welding process. To briefly discuss about the conditions & conclude the suitable condition for Aluminium alloy 5052 H32. To plot and conclude the hardness values for various conditions. The tool material Mild Steel IS 2062 FE410 cone type and thread type has been selected for this research for various speeds to find suitable condition. The micro structure and macro structure have checking the structural formation of welded area in details to know it the strength of the joining. The present friction stir welding research is implementing the new tools for the current issues; here we try to implement new material for already available tools.

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Three phase induction motors consume 6% of industrial electricity. Just 1% increase in efficiency of all the motors in India will save 500MW powers which needs the initial generation cost of 2000 crores. Actions were taken to use the enamel filled zirconia nano composite as the coating for the induction motor to improve its efficiency. The efficiency of the induction motor was increased by 5 % by adding nanocomposite (80% ZrO 2 +20%Y 2 O 3 ) (Metco202) to the enamel used as the coating for the windings of the three phase squirrel cage induction motor. Heat run test was performed on electrical machines to determine the total loss of energy dissipated as heat. The addition of nano composites to the enamel has increase the temperature withstanding capacity of the induction motor. The values of electromagnetic interference produced by normal induction motor and nano coated induction motor was also measured and analyzed. There was a reduction of 15 to 60% in the values of the electromagnetic interference produced by the normal induction motor when compared to that of nanocomposite filled enamel coated induction motor at various angles. This method can be used as one of the method to reduce the electromagnetic interference by the induction motor.