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39 results on '"Kala, Prateek"'

4. Experimental Investigation into Depositing Low Melting Point Alloy Utilizing Fused Deposition (FDM) Modelling Technique

Author

Parvanda, Rishi, Kala, Prateek, Ghosh, Arindam, Series Editor, Chua, Daniel, Series Editor, de Souza, Flavio Leandro, Series Editor, Aktas, Oral Cenk, Series Editor, Han, Yafang, Series Editor, Gong, Jianghong, Series Editor, Jawaid, Mohammad, Series Editor, Kumar, Ajay, editor, Srivatsan, T. S., editor, Ravi Sankar, Mamilla, editor, Venkaiah, N., editor, and Seetharamu, S., editor

Published
2024
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28. Effect of Arc Polarity on the Quality of Deposition in GTAW Welding-Based Additive Manufacturing Process: A Preliminary Study.

Author

Gokhale, Nitish P., Gadakh, Deepak A., and Kala, Prateek

Subjects
MANUFACTURING processes, GAS tungsten arc welding, DIRECT current circuits, TUNGSTEN electrodes, HEAT transfer, SURFACE finishing, METAL finishing
Abstract

A Gas tungsten arc welding (GTAW)-based additive manufacturing has a potential for manufacturing metallic parts with better dimensional accuracy and dense structure. This paper discusses the issues in the GTAW-based metal deposition process for the positive and negative polarity of the welding electrode in the direct current circuit. The effect of direct current electrode positive (DCEP) and direct current electrode negative (DCEN) polarity on GTAW-based metal deposition process has been discussed. The experimental study has been done with a constant voltage source of ESAB Caddy 2200i welding machine and the metal beads were deposited on the substrate plate of mild steel. The results of these experiments showed that the metal deposited using DCEN polarity has a better dimensional accuracy over DCEP polarity due to its stability in arc formation and proper transmission of heat. The experimental investigation showed that the DCEP polarity causes the deterioration of the tungsten electrode after a few trials. The work done in this paper will help to distinguish between the use of DCEP polarity and DCEN polarity in GTAW-based additive manufacturing process for depositing the metal with better dimensional accuracy and better surface finish. [ABSTRACT FROM AUTHOR]

Published
2022
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33. On the design and fabrication of polyvinylidene fluoride-based sensors to detect recurrence of diaphragmatic hernia

Author

Barwar, Abhishek, Kala, Prateek, and Singh, Rupinder

Abstract

Polyvinylidene fluoride (PVDF) bio-sensors have gained potential interest in remote health monitoring of patients using Internet of Things (IoT) technologies. But hitherto, limited studies have reported on the fabrication of PVDF-hydroxyapatite (HAP)-chitosan (CS) based sensors processed through two different processing routes from a process suitability viewpoint to determine the recurrence of diaphragmatic hernia (DH). The sensors fabricated in this study comprise three layers, that is, a substrate (dielectric material), a metallic patch, and a ground plane that works on the microstrip patch antenna (MPA). Two manufacturing approaches have been followed in this study for the fabrication of the dielectric substrate: material extrusion (MEX) and gel-casting. Primarily, PVDF (90%) -HAP (8%) -CS (2%) has been selected for the sample preparation, following that different characterizations have been performed on the chosen composition to ensure its suitability for sensor fabrication. The simulated results were extracted in the form of return loss (S11) versus radiating frequency (fr), specific absorption rate (SAR) field, electric (E), and magnetic (H) field variables. Following that, the substrates were fabricated through the MEX and gel-casting approach, and Cu tape was used to make the conducting parts of the sensor. The sensor’s radio-frequency (RF) behaviour was tested on a vector network analyser (VNA) to obtain the output of S11versus fr. The RF-characteristic of the sensors fabricated through MEX and gel-casting approaches represent that the sensors designed for dielectric constant (εr) = 9.61 resonate at 2.72 GHz for MEX and 2.67 GHz for gel-casting while possessing the S11of −14.14 and −28.40 dB respectively.

Published
2024
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35. Experimental investigations into ultrasonic-assisted double-disk magnetic abrasive finishing of two paramagnetic materials.

Author

Kala, Prateek and Pandey, Pulak M.

Abstract

This article evaluates the finishing performance of ultrasonic-assisted double-disk magnetic abrasive finishing process on two paramagnetic materials (copper alloy and stainless steel) with different mechanical properties such as flow stress, hardness, shear modulus, and so on. The finishing experiments were performed based on response surface methodology. The results obtained after finishing have been analyzed to determine the effect of different process parameters such as working gap, rotational speed, and pulse-on time of ultrasonic vibration for both work materials and to study various interaction effects that may significantly affect the finishing performance by the process. The outcome of analysis for the two different work materials has been critically compared to understand the effect of the considered process parameters on the finishing performance of the process based on mechanical properties of the workpiece such as hardness. Furthermore, the scanning electron microscopy and atomic force microscopy were carried on the workpiece surface to understand the possible mechanism of material removal and the surface morphology produced after the finishing process. [ABSTRACT FROM AUTHOR]

Published
2017
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