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1-4 of 4
Ranajit Ghosh
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Proceedings Papers
HT 2021, Heat Treat 2021: Proceedings from the 31st Heat Treating Society Conference and Exposition, 146-152, September 14–16, 2021,
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Heat treaters are adopting more and more Industry 4.0 techniques and solution packages to improve production processes and product quality. Proper specification, measurement, and control of heat-treating atmospheres are always critical to achieving the desired metallurgical and microstructural results. The combination of atmosphere measurements and other furnace operating parameters (e.g., furnace temperature and pressure) can provide a better view of the whole production. Thermodynamic calculations and field experiences can be integrated into the smart solution to provide process engineers more capabilities to manage and optimize production. In this article, our recent research and development work on smart solutions for the heat-treating industry will be presented and discussed.
Proceedings Papers
HT2017, Heat Treat 2017: Proceedings from the 29th Heat Treating Society Conference and Exposition, 146-148, October 24–26, 2017,
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Dew point (DP) is a function of the furnace atmosphere composition. In a metal processing furnace, maintaining appropriate atmosphere composition is critical to achieving the desired gas/metal reactions and quality and consistency of the treated product. Continuous measurement of DP is always challenging because of particulates and vapor-phase contaminants in sampled gas stream which can potentially accumulate in filtering systems and on sensors. The DP measurement can also be affected by temperature variations within the sampling unit. Thus, DP readings can drift significantly, necessitating frequent cleaning, recalibration, and sensor replacement. Air Products has developed a DP monitoring system that addresses these issues and based on long-term testing at a customer site, drifts/changes of DP readings on calibration gas were not observed after more than one year of operation, without any maintenance. The contamination and drift issues have been mitigated by incorporating an automated self-cleaning and sensor calibration process after pre-set measurement periods. Temperature control of the sensor and the sampling system are also essential to maintain consistency, and can be achieved via various design features. Drifts/changes in DP that are reported through local monitoring/alarms or remotely through cloud server access can also help to address furnace operational issues quickly and efficiently.
Proceedings Papers
HT2017, Heat Treat 2017: Proceedings from the 29th Heat Treating Society Conference and Exposition, 153-156, October 24–26, 2017,
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The atmospheres used in a brazing furnace play a critical role in the final quality and metallurgical properties of the brazed component. Typically, exothermic, dissociated ammonia and nitrogen/hydrogen atmospheres are used for brazing mild steel, alloy steel and stainless steel components. The atmosphere composition, flow rates, pressures, and dew point are some of the key variables control final quality. Almost all brazing companies have quality issues that directly result from improper atmosphere application and control. Common problems include oxidation, flashing, inadequate braze flow, sooting, decarburization and carbon pickup. This troubleshooting presentation reviews years of field experience with nitrogen and hydrogen based atmosphere systems. It will help the heat treater or the brazing production engineer to identify these problems and apply appropriate corrective action.
Journal Articles
Journal: AM&P Technical Articles
AM&P Technical Articles (2016) 174 (8): 42–45.
Published: 01 September 2016
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Accurate and continuous dew point measurement is key to maintaining the atmosphere required to achieve high quality and consistency of sintered products in powder metallurgy processing.