Friction welding is a solid-state joining technique, and joining of dissimilar materials has been witnessing tremendous development in various applications. In this study, friction welding is carried out in dissimilar materials, austenitic stainless steel and copper, which find application in power generators. The parameters such as friction pressure, upset pressure, rotational speed and burn-off length are considered to determine its influence on tensile strength, metal loss and weld time. Taguchi’s L27 orthogonal array is used for experimental design to maximize the tensile strength as well as minimize the metal loss and weld time. Optimal parameters are determined through multiple performance characteristics, and it is found that friction pressure of 22 MPa, upset pressure of 108 MPa, rotational speed of 500 r/min and burn-off length of 1 mm yield good mechanical and metallurgical properties.
In industrial applications, particularly in aero, marine and medical industries, titanium has received great attention as a useful material and electrical discharge machining as its machining process. Selection of optimal machining parameters in a multi-objective environment is essential for specific workpiece and tool material combination, which is the concern of industries to improve the overall productivity at less cost. In this article, optimization of critical electrical discharge machining parameters such as pulse current, on time of pulse, off time of pulse and tool geometry depending on the responses such as titanium machining rate, graphite wear rate, surface roughness and deviation between entry and exit while machining titanium grade 5 alloy with graphite tool electrode at negative polarity is presented. Taguchi’s L27 orthogonal array was used to design the experiment with interaction between factors. The weighing method was used to integrate different objectives into one performance. The optimal combination of process parameters was found statistically using signal-to-noise ratios. Significance was checked by analysis of variance. Optimum parameters were found to be pulse current 15 A, on time of pulse 50 µs, off time of pulse 200 µs and cylindrical tool geometry. Resultant percentage improvements in different responses were presented.
In this research an attempt is made to study the effect of waste glass power in Concrete using waste glass, which is non biodegradable and not suitable to landfill. This study is carried out to use such waste materials into construction industries so that our environment is free to one of the major pollutant produced by the manufacturing industries. The main aim of this study is to utilization of waste glass power as a partial replacement of fine aggregate. In this study the aim is to determine the percentage of glass replacement, resulting in optimal compressive strength. Concrete nominal mix of M20 with different percentages of Glass power has been evaluated as per IS 2386(part IV) and IS 383. Waste glass powder was replace with fine aggregate in various percentages such as 5%,10%,15%,20%,25%,30%,35%,40%,45%, and 50%. Reference concrete mix is also made for comparative reasons.
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