Ghosh A.,Indian School of Mines |
Chattopadhyaya S.,Indian School of Mines |
Mukherjee S.,MECON Ltd
Advanced Materials Research | Year: 2011
In Submerged Arc Welding process involves critical set of variables which are needed to control. An attempt has been made in this paper to find out-the influence of the heat input and bead volume on HAZ Hardness for Submerged Arc Welding Process of Mild steel plates. Mild steel plates are welded by changing input variables (current, voltage, travel speed, i.e. heat input) and Rockwell hardness no. has been observed on welded portion and at the zone adjacent to the welded portion. A detailed analysis of the microstructure changes is carried out to understand the HAZ softening phenomenon. © (2011) Trans Tech Publications, Switzerland.
Chakraborty B.,MECON Ltd |
Chakraborty S.,Birla Institute of Technology
Optical Engineering | Year: 2016
The rhomb-type achromatic prism retarder utilizes the phase difference introduced at the glass-air interface, where the beam of light undergoes total internal reflection. With the proper choice of glass materials and the number of total internal reflection, it is possible to obtain a desired phase difference. The phase difference introduced is also dependent on the angle of incidence of the light beam at the glass-air interface. A small change in angle of incidence causes a considerable change in phase difference. The change in the phase difference introduced with the change in external angle of incidence of the light beam in an achromatic prism-type quarter-wave retarder is studied both theoretically and experimentally. The experimental results obtained are found to be in accordance with the theoretical results. © 2016 Society of Photo-Optical Instrumentation Engineers (SPIE).
Mukhopadhyay M.K.,Mecon Ltd. |
Adak S.,Mecon Ltd. |
Banerjee P.,Mecon Ltd. |
Skapja V.,Mecon Ltd.
Journal of Mines, Metals and Fuels | Year: 2012
While there is need to address a number of daunting issues as India continues to increase production of major minerals to meet a steady industrial growth rate, perhaps none present as much of a hurdle as the environmental and social challenges, resulting from mining of minerals. On one side, a gradually increasing industrial growth rate demands quantum increase of coal and iron ore production and on the other hand stricter environmental impositions like "no-go" areas restrict the growth; the social pressures act as the third dimension to further complicate the problem. Advanced system approaches like adoption of environmentally sustainable land use zoning in coalfields, use of JFM in mining industry, growing use of surface continuous miners to obviate blasting etc. are the need of the day. Constant care for innovative technology development is the key solution towards a meaningful trade off between environmental and social resource generation and production upgradation.
Bhattacharya S.,MECON Ltd |
Vishwakarma U.K.,MECON Ltd |
Bhowmik A.,MECON Ltd |
Misra P.,MECON Ltd
Journal of the Institution of Engineers (India), Part MM: Metallurgy and Material Science Division | Year: 2011
The rural Indian population is large, which is also characterized by high growth rate. About 70% of India's population lives in around 636 365 villages in rural areas. The purchasing power in rural India is on steady rise and it has resulted in the growth of the rural market. The market has been growing at 3% - 4% per annum adding more than one million new consumers every year. The rural consumer market, which grew by 25% in 2008 when demand in urban areas slowed due to the global recession, is expected to reach huge size. This rural market is dominated by the fast moving consumer goods (FMCG), mobile phones, two wheelers, etc. Steel products are yet to make inroads into hitherto untapped Indian rural market. In India, per capita consumption of steel is skewed with urban areas reporting around 77kg and rural areas as low as 2 kg. As per the National Steel Policy, 2005 of Ministry of Steel (MoS), per-capita urban consumption was considered to reach 165 kg and rural consumption to 4 kg by 2019-20. Vast rural areas of the country and fast growing rural market are likely to provide excellent market opportunity for steel products. Indian steel makers are also formulating marketing strategies for entering into the rural markets in a big way. As demand drives supply, the upsurge in rural demand is expected to give boost to the entire Indian steel industry, both demand as well as supply side. Therefore, in the process of future growth of Indian steel industry, rural market is likely to play a vital role. National Steel Policy, 2005 has put special thrust on this issue. The present study is an attempt to explore the hitherto unexplored issue of rural market for steel products and its vital role in the growth of Indian steel industry. The study provides a thorough analysis of Indian rural market, assessment of rural market for steel products, product identification for rural people, marketing strategy and policy suggestions. The analysis suggests that the steel has a good market in rural India although it is latent at present. Penetration of the steel and steel-using products in rural India is likely to play an important role in the growth of Indian steel industry. This requires formulation /implementation of well designed marketing strategies.
Chakraborty B.,MECON Ltd |
Sinha B.K.,MECON Ltd
Sensors and Transducers | Year: 2013
Emissivity is an important consideration for temperature measurement through infrared imaging. The theoretical background depicting the role of emissivity and other significant parameters for temperature measurement with the help of an infrared camera is discussed. Experiment is carried out for estimating the emissivity of oxide coated steel surface and rusted iron surface with the help of a long wave infrared camera and using a reference surface of known higher emissivity. The measured emissivity values are subjected to statistical analysis and the final estimated value is compared with the published value. The effect of the difference between estimated value and published value of emissivity on the measured temperature is also discussed. © 2013 IFSA.
Chakraborty B.,MECON Ltd |
Sinha B.K.,MECON Ltd
AIP Conference Proceedings | Year: 2011
Fiber optic sensor is commonly used in control and monitoring system for material deformation, strain, temperature, pressure and other industrial process parameters. Fiber optic displacement sensor based on intensity modulation can be designed by using the transmission technique where the intensity gradually changes due to change of detected laser intensity. Previous optical fiber based displacement sensors are constructed using two fibers along with a mirror arrangement or a single optical fiber acting as both transmitter and receiver such as 2X1 fiber couplers. The reported resolution of the system was in the range of 5 μm-10 μm. In our present study the displacement sensor composed of a laser source, optical fiber cable, microscope objective and power meter is designed. As in source-fiber coupling geometry, the microscope objective focuses the laser light onto a multimode glass fiber. The other end of the fiber is coupled to a power meter. As the fiber is displaced towards the focused spot, the detected power changes. The displacement resolution of 5 μm is obtained with this simple setup. In the present paper, the results of theoretical analysis and experimental study of such a simple optical fiber based displacement sensor are presented. © 2011 American Institute of Physics.
Chakraborty B.,MECON Ltd
Journal of Optics (India) | Year: 2014
Confocal microscopy is an important state-of-art in the field of optical microscopy with wide ranging applications in surface microstructuring of metal and non-metal surfaces, finger print observations in forensic sciences, 3D volume rendering of biological specimen etc. The advancement in digital image processing, availability of high speed computer with high memory size and simplicity of image grabbing technique enables the use of high sensitive CCD camera in confocal microscope setup. In addition to the inherent parameters of the confocal microscope such as the size of the confocal aperture, numerical aperture of the microscope objective etc., the camera parameters mainly camera gamma and gain affects the performance of the microscope. In the present paper the effect of camera gamma and gain on the contrast and shape of the detected target lines is studied experimentally through focal plane scanning of a 1951 USAF test target in a confocal microscope setup. The effect of camera gamma on the axial resolution of the confocal microscope setup is also studied experimentally through axial scanning with a mirror. © 2013 Optical Society of India.