Analysing the Effect of Parameters in Multipass Submerged arc Welding Process

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 provide a purer and cleaner high volume weldment that has a relatively a higher material deposition rate compared to the traditional welding welding methods. The effect of controllable process variables on the heat input and the microhardness of weld metal and heat affected zone (HAZ) for bead on joint welding were calculated and analysed using design of experiment software and fractional factorial technique developed for the multipass SAW of boiler and pressure vessel plates. The main purpose of present work is to investigate and correlated the relationship between various parameters and microhardness and microhardness of single “V” butt joint and predicting weld bead qualities before applying to the actual joining of metal by welding. It is found that the microhardness of weld metal and heat affected zone decreased when the number of passes increases that is total heat input increased.