DEVELOPMENT OF HEAT TRANSFER MODEL FOR TWIN SUBMERGED ARC WELDING (SAW)

Abstract

The present investigation deals with heat transfer study during twin wire submerged arc welding. This welding process differs . from single wire welding and uses two wires simultaneously being fed by the same feed motor. As well as same power source supplies the current. Twin wire submerged -arc welding offers higher deposition. rate and lower penetration. Previous studies are related with single wire operation, and at the same time heat -source model for twin wire has not been revealed. - This gap and the difference in mechanism of twin wire welding; have motivated by the present investigation. - This work consists of viability study of previous models and subsequently development of heat source model- for Twin wire submerged are welding. This development has been carried out-with the help of experimental measurement of temperature responses 'at different points situated within the body of the work piece. This exercise has been carried out under different welding conditions. Stationary heat source is used to predict the peak, temperature at different points, -which are then used to model heat source term (heat source model) of Fourier's conduction equation.' A computer code has been generated to accomplish this task. - The considered approach is quite successful in predicting the ' peak temperatures as well as it provides an understanding of heat transfer behavior during Twin wire submerged arc welding. It has been found that the heat source model is a function of welding conditions. In order to predict temperature generated due to twin wire welding, heat source parameters should be changed according to welding conditions. The first part of this report consists of introduction and literature review which is followed by experimental procedure. The next part consists of model development, which is followed by the outcomes of the present investigation. The results have been thoroughly analyzed in the chapter titled `Result and Discussion'.. This work is then concluded and scope of the future work is mentioned.