Colmonoy 6 alloy has been regarded as an efficient overlay material for various grades of substrate materials. The PTAW process has been emerged as a very useful process to deposit such materials effectively. Torch oscillation may become an efficient PTAW parameter to achieve a desired microstructure due to its significant advantage over liner torch movement due to a faster cooling of the weld pool. Proposed work aims to analyse the influence of torch oscillation on the microstructure of Colmonoy 6 overlay surface on SS304 substrate. The structure of the surface deposited with PTAW torch oscillation shows increase in the Cr concentration in δ-Cr7C3, θ-(Cr, Fe)7C3 and μ-Cr23C7 phases upon characterization by SEM with EDS and XRD. This decreases the solidification temperature of Ni-based soft matrix which provides a higher hardness of the coating. These outcomes can also come handy for other grades of materials to control their metallurgical characteristics effectively.

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Bevel gears are widely used in the application where requirement is to transmit the power in 90 degrees. Where shafts intersect each other, the basic need is fulfilled by the bevel gear pair only. These gears are used in many applications and the most common application is differential use in automotives. This paper mainly focuses on the design and mathematical modeling of the bevel gear pair used in gate valve unit. Gate valve is valve which opens by lifting a round or rectangular gate/wedge out of the path of the fluid. To operate this gate valve the main component used is bevel gear pair. It is needed to check the maximum torque transmission capacity of gear pair so as to know its limits. Involute gear is used in this application. Gate valves are actuated by a threaded stem which connects the actuator (e.g. handwheel or motor) to the gate.

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