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Mishra, Bhanu K.
- Impact of Process Modelling on Current Direction of Welding Research and Future Targets
Authors
1 Institute of Petroleum Technology, Gandhinagar - 382 007, IN
2 Indian Institute of Technology Roorkee, Roorkee - 247 667, IN
Source
Indian Welding Journal, Vol 41, No 4 (2008), Pagination: 43-50Abstract
The present paper gives a description of process modelling and its impact on current direction of welding research and future targets. It analyses the research work carried out in the filed of process modelling and presents quantitative analysis. The present work classifies and subsequently quantifies the welding research on the basis of approaches including modelling and simulation, product development, cause-effect analysis and sensor and control. The analysis indicates that modelling based research is primarily reported for existing technologies and existing materials. Research in new technologies using modelling is still is in developing stages and new materials based research is primarily carried out with cause-effect based analysis. The paper also mentions the future targets in welding research and indicates the role of process modelling in achieving the targets.
Keywords
Process Modelling, Welding Research, Future Targets.
- Modified Mathematical Models for Melting Rate in Submerged Arc Welding
Authors
1 Institute of Petroleum Technology, Gandhinagar, IN
2 Department of Mechanical and Industrial Engineering, Indian Institute of Technology, Roorkee, IN
3 Department of Mechanical and Industrial Engineering, IN
Source
Indian Welding Journal, Vol 40, No 4 (2007), Pagination: 21-32Abstract
Modified mathematical models for melting rate during submerged arc welding with straight and reverse polarities have been proposed. The present work is a result of a critical analysis of existing models and subsequent modification in order to improve the predictability and practicability. The proposed models bridge the gap between less scientific shop-fioor-friendly models and scientifically correct but not so shop-floor- friendly models. Instead of experimental measurement of electrode extension or making the assumption that the electrode extension is equal to contact tube to work-piece distance, the present work models the role of electrode extension during melting by considering the effect of process parameters on it. On the other hand, influence of process parameters on arc heating has also been incorporated. The developed models cover the effect of fundamental parameters like current, voltage, electrode extension and wire diameters.
Simulated annealing has been used to calibrate the proposed models and subsequently the models are validated with data points different from the points used for model calibration. The modified models provide better accuracy than the models that have been constituted with the above stated assumption as well as it is more practical than those models in which actual electrode extension has been experimentally measured. The outcome of investigation has been analyzed in terms of improvement in the predictability, resemblance with physics of the process and generalization capacity of the models. The approach of the present work is applicable for future research in other welding processes.