Aniruddha Ghosh

Prediction of Weld Bead Parameters, Transient Temperature Distribution & HAZ Width of Submerged Arc Welded Structural Steel Plates

In submerged arc welding process, concept on temperature distribution is essential in order to control HAZ dimensions and get the required bead size and quality. In this paper, an analytical solution for moving heat source with Gaussian distribution of inside volume of central conicoidal shape is derived. Heat transfer in welded plates during welding is assumed to be conductive heat transfer of a semi infinite body. With the help of this analytical solution, transient temperature distribution, HAZ width, weld bead dimensions are estimated. Good agreements between predicted and experimental values are achieved.

Characterization of Friction Surfaced Coatings of AISI 316 Tool over High-Speed-Steel Substrate

Powered by TCPDF (www.tcpdf.org) This material is protected by copyright and other intellectual property rights, and duplication or sale of all or part of any of the repository collections is not permitted, except that material may be duplicated by you for your research use or educational purposes in electronic or print form. You must obtain permission for any other use. Electronic or print copies may not be offered, whether for sale or otherwise to anyone who is not an authorised user. Kumar, Ravi; Chattopadhyaya, Somnath; Ghosh, Aniruddha; Krolczyk, Grzegorz M.; Santos Vilaca da Silva, Pedro; Kumar, Ratnesh; Srivastava, Madhulika; Shariq, Mohammad; Triphathi, Rupam Characterization of friction surfaced coatings of aisi 316 tool over high-speed-steel substrate

Assessment of Heat Affected Zone of Submerged Arc Welding Process through Digital Image Processing

Abstract Submerged arc welding (SAW) is a high quality, high deposition rate welding process commonly used to join plates of higher thickness in load bearing components. This process of arc welding provides a purer and cleaner high volume weldment that has relatively a higher material deposition rate compared to the traditional welding methods. A common issue in the application of SAW process raises a concern about the uncertainties involved with the heat affected zone (HAZ) in and around the weldment. The most intriguing issue is about HAZ softening that imparts some uncertainties in the welded quality. It increases the probability of fatigue failures at the weakest zones caused by the heating and cooling cycle of the weld zone. An attempt has been made in this paper to assess the heat affected zone of submerged arc welding of structural steel plates through the analysis of the grain structure by means of digital image processing techniques

Analytical solution for transient temperature distribution of semi -infinite body subjected to 3-D moving heat source of submerged Arc Welding process

Studies on temperature distribution during welding are very important because this may pave the way for application of microstructure modeling, thermal stress analysis, residual stress/distribution1 and welding process simulation. An attempt has been made in this paper to predict of temperature variation of entire plates during welding and after welding through an analytical solution is derived from the transient multi dimensional heat conduction of infinite plate to finite thickness. The heat input that is applied on the plate is exactly same amount of heat lost for electric arc is assumed to be a moving double central conicoidal heat source with Gaussian distribution for Submerged Arc Welding process. The prediction was compared with experimental results with generally good agreement.

3rd Degree Mathematical Model Appropriate for Parametric Estimation of SAW Process

An attempt has been made in this paper to develop a appropriate model for predicting the output responses of Submerged Arc Welding (SAW) process with the help of neural network technique. Also a mathematical model has been developed to study the effects of input variable (i.e. current, voltage, travel speed) on output responses (i.e. reinforcement height, weld bead width, metal deposition rate). SAW process has been chosen for this application because of the complex set of variables involved in the process as well as its significant application in the manufacturing of critical equipments which have a lot of economic and social implications. Under this study the neural network model is trained according to the actual inputs and outputs. When the training is completed then the desired inputs are given to the model and it gives the estimated output value. And according to this we can also estimate the error between the actual and predicted results. Side by side accurecy of mathematical model has been checked.

Prediction of HAZ Width of Submerged Arc Welded Plates

This paper is focused on deriving an analytical solution to predict the transient temperature distribution on the plate during the process of Submerged Arc Welding (SAW). An analytical solution is derived from the transient three-dimensional heat conduction equation. The energy input that is applied on the plate is taken as the volume of heat lost from the electric arc. The electric arc is assumed to be a moving double-ellipsoidal heat source with a close proximity to a Gaussian distribution. It is observed that the predicted values are in good agreement with the experimental results. HAZ width calculation is also done with the help of the analytical solution of the transient-three dimensional heat conduction equation. Very good agreement between predicted and experimental values has been archived.

Prediction of Temperature Distribution on Submerged Arc Welded Plates through Gaussian Heat Distribution Technique

Submerged Arc Welding process (SAW) is a high quality, very high deposition rate welding process. It has lot of social and economical implecations.This paper makes an attempt to uncover an important area on studies of temperature distribution during submerged arc welding because this may pave the way for application of microstructure modeling, thermal stress analysis, residual stress/distribution and welding process simulation. Prediction of temperature variation of entire plates during welding through an analytical solution is derived from the transient multi dimensional heat conduction of semi infinite plate. The heat input that is applied on the plate is exactly same amount of heat lost for electric arc, which is assumed to be a moving double conical heat source with Gaussian distribution for Submerged Arc Welding process. Good agreement between predicted and experimental results has been achieved.

Numerical Analysis of Heat Transfer of Arc Welded Plate

In submerged arc welding process, the understanding of temperature distribution is essential in order to control the dimension of heat affected zone and to get the required weld bead shape and size. Moreover, the temperature profile is required to estimate the stress distribution in thermo mechanical analysis of the process. In this work, a numerical solution for moving heat source with Gaussian distribution of heat flux density over the volume of oval shape is derived using finite difference method. Heat transfer in welded plates during welding from fusion zone to heat affected zone (HAZ) is assumed to be conductive heat transfer. Convective and radiative heat losses are also considered for remaining zone of welded plate. With the help of the numerical solution, transient temperature distribution is estimated. HAZ widths are also measured experimentally. Decent agreements between predicted and experimental values are achieved.

Estimation of temperature distribution on submerged arc welded plates through conical heat distribution technique

Submerged arc welding (SAW) process is a high quality, very high deposition rate welding process. It has lot of social and economical implications. This paper makes an attempt to uncover an important area on studies of temperature distribution during submerged arc welding because this may pave the way for application of microstructure modelling, thermal stress analysis, residual stress/distribution and welding process simulation. Temperature variation of entire plates during welding is predicted through an analytical solution which is derived from the transient multi-dimensional heat conduction of semi-infinite plate. The heat input that is applied on the plate is exactly same amount of heat lost form electric arc. Electric arc is assumed to be a moving double conical heat source with Gaussian distribution for submerged arc welding process. Good agreement between the predicted temperature distribution values and measured temperature distribution values on submerged arc welded plates are observed.

Solution for Modeling 3D Moving Heat Sources in a Semi-Infinite Medium and Applications to Submerged Arc Welding

The determination of the temperature distribution of submerged arc-welded plates is essential when designing submerged arc-welded joints. The key role for the change of weld-bead geometry dimension, thermal stress, residual stress, tensile stress, hardness, etc., is heat input. Heat input is the function of temperature distribution of submerged arc welded plates. An attempt is made in this paper to find the analytical solution for a moving heat-source of egg-shape in a semi-infinite body. The considered modes of heat transfer for this study are conduction and convection. The solution has been obtained by integrating the instantaneous point heat source throughout the heat source volume. Very good agreement between the predicted and measured transient temperatures at various points on submerged arc-welded plates has been obtained. The predicted yield parameters are also in good agreement with the measured values.