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Thāne, India

Paul A.K.,1602 Fiona
Proceedings of IEEE International Workshop on Variable Structure Systems | Year: 2012

A practical arc welding controller should be able to make, within its power range, all arc welding joints effectively and efficiently. Existence of large diversity at input and process, positional welding, polarity etc, and need to meet wide range quality engineering parameters of joints along with creating a favorable impact of process on energy efficiency and environment have made arc welding complex. Representative dynamical systems for starting, stopping and normal welding are different. Complexity of the process needs close control of multiple dynamical modes with widely different time range. They are molten pool oscillations, dynamics of metal transfer, spatter generation and arc stability. This article explores the scope of practical implementation of SMC to complete arc welding process. In manual welding arc is extinguished by increasing the arc length much beyond the controller can sustain. In that process, it produces large unusable heat particularly with 6013 (rutile) electrodes causing discomfort to the welder and co-workers. The present article, as well, discusses implementation mechanism of SMC to optimize arc light intensity and reduce heat generation in arc column in order to convert mechanism of manual arc extinction of SMAW welder friendly. Chattering issue is not important. © 2012 IEEE. Source


Paul A.K.,1602 Fiona
Proceedings - 2011 International Conference on Energy, Automation and Signal, ICEAS - 2011 | Year: 2011

Continuous evolution in process and in equipment in arc welding improves compatibility in energy domain. It helps optimize resources such as energy, materials, labor etc, and yield desired productivity and improved quality engineering goals. Modern inverter technology provides multitude of benefits virtually to each entity associated with the process. Efficiency, settling time of output variables and compactness and light weight are major pre-requisites of arc welding equipment. They are all achieved if switching frequency of inverter is kept high. Generally, higher switching frequency is achieved through soft switching. This paper elaborates that input-material-sensitive hard-switched topology is functionally superior to soft-switched topologies and generate superior design for manufacturability issues. It achieves power density ideal for welding power range. © 2011 IEEE. Source


Energy flow from source to load via electrical domain involves dual conversion and makes loads inefficient. The status has changed once energy is channelled through power electronic equipments. Their function spaces are beyond just achieving functionality as more loads are under active control and grid is enabled to deliver its potential. Multiple topologies exist to achieve mere functionality. Equipments should possess high functional reliability and reliability. Switching frequency is one critical parameter for active control of load. Higher switching frequency needs soft-switching topology. Parametric significance changes with topology and so is its worst-case design. Their influence in high speed circuit with or without proper feedback affects quality engineering parameters. This paper presents experimental approaches to find functional integrity at different levels in product to achieve functional reliability and reliability. © 2011 Inderscience Enterprises Ltd. Source

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