Indian Welding Journal

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Investigation of Heat Flow during MIG Welding of Stainless Steel 409M Plates and Prediction of Bead Parameters


Affiliations
1 Department of Mechanical Engineering, NSUT, New Delhi, India
2 Department of Mechanical Engineering, IIT Delhi, India
     

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Nearly 90% of welding in the world is carried out by one or the other arc welding process, therefore it is imperative to discuss the aspect of heat flow and temperature distribution in arc welding.The knowledge of temperature distribution in plates during and after welding is necessary for predicting microstructure, calculating bead parameters, distortions and residual stresses. Thus, to achieve a weld of desired quality to perform in service satisfactorily, it is essential to know the temperature distribution during welding. In the present case, an arrangement of thermocouples was developed with microprocessor based electronic control which was successfully used to plot real time temperature graphs (thermal histories) during welding of plates at different input parameters. From these temperature plots, isotherms for different weldments were generated which were found helpful in determining the cooling rates. These weld isotherms were then used to estimate temperature at different points. These results were then compared with their estimated values calculated from empirical relations and were found to be in coherence with the experimental values within reasonable limits. The peak temperature values obtained from the thermal histories were used to approximately estimate the critical weld bead dimensions like penetration and weld width with the help of empirical relations and when compared with actual values, were found to be in good conformance.

Keywords

Arc Welding, Temperature Distribution, Thermocouples, Temperature Graphs, Bead Parameters.
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  • Investigation of Heat Flow during MIG Welding of Stainless Steel 409M Plates and Prediction of Bead Parameters

Abstract Views: 220  |  PDF Views: 4

Authors

Pradeep Khanna
Department of Mechanical Engineering, NSUT, New Delhi, India
R. S. Parmar
Department of Mechanical Engineering, IIT Delhi, India

Abstract


Nearly 90% of welding in the world is carried out by one or the other arc welding process, therefore it is imperative to discuss the aspect of heat flow and temperature distribution in arc welding.The knowledge of temperature distribution in plates during and after welding is necessary for predicting microstructure, calculating bead parameters, distortions and residual stresses. Thus, to achieve a weld of desired quality to perform in service satisfactorily, it is essential to know the temperature distribution during welding. In the present case, an arrangement of thermocouples was developed with microprocessor based electronic control which was successfully used to plot real time temperature graphs (thermal histories) during welding of plates at different input parameters. From these temperature plots, isotherms for different weldments were generated which were found helpful in determining the cooling rates. These weld isotherms were then used to estimate temperature at different points. These results were then compared with their estimated values calculated from empirical relations and were found to be in coherence with the experimental values within reasonable limits. The peak temperature values obtained from the thermal histories were used to approximately estimate the critical weld bead dimensions like penetration and weld width with the help of empirical relations and when compared with actual values, were found to be in good conformance.

Keywords


Arc Welding, Temperature Distribution, Thermocouples, Temperature Graphs, Bead Parameters.

References





DOI: https://doi.org/10.22486/iwj.v53i4.203670