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In this research, the effects of heat input on tensile properties and microstructure were investigated for super alloy Inconel-718 sheets weld by Tungsten Inert Gas (TIG) welding process. The tensile properties and microstructure of weld joints were evaluated. The experiment was conducted with six different combinations of welding parameters like welding current, voltage and welding speed, which were give in six different welding heat input combinations of welding parameters. The experimental results shows that the welding joints weld with low welding heat input was yield higher tensile properties. From the experimentation it was understand that the tensile properties increases when the welding heat input decrease. Drastic grain coarsening was evidenced when the heat input was increases. For the weld joints experimented in this research it was also observed that amount of laves phase was increased with increase in the welding heat input which is the major fact for noticeable variation in the ultimate tensile strength of the weld joints welded by TIG welding process with different welding heat input.

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Redesigning of a system is a modification of existing system for reducing the disadvantages over the system and improves the features for getting more output that are desired. For redesigning the existing conventional heat exchanger by the new designed heat exchanger. Conventional heat exchanger has a major disadvantage consuming more space, high cost and maintenance is difficult. Plate heat exchanger has a major advantage over a conventional heat exchanger are that the liquid are exposed to main larger sur face area because the liquids spread out over the plate. It is a specialized design well suited to transferring heat between low pressure liquids. The plate produces an extremely large surface area which allows for the fasten possible transfer and studying the plate material, gasket material, chevron angle, and surface enlargement angle. Design a plate heat exchanger by according more advantages and evaluate the cos t of newly designed heat exchanger and compared to existing heat exchangers and validate the designs by flow analysis.