A study on measuring system of Submerged Arc welding for panel butt joint in shipyard

SAW (Submerged Arc Welding) machines normally consist of two or more torches to increase productivity. The performance of conventional SAW depends on the experience of the operators. Error between the measured and the actual values of welding conditions is accumulated as time goes on. Therefore, the weld quality cannot be guaranteed because of the error. Even if a number of welding defects occur, workers are not able to find out the cause of defects because the measured signals show a big difference with the actual values. In this study, a stable measuring system was developed for the welding conditions such as current, voltage, speed so that workers can easily monitor the actual welding conditions. If the error between monitored and measured signals occurs, workers are able to easily correct the actual welding conditions through this system. In this way, it increased the reliability of the welding conditions. This system was applied to an actual welding system and showed that the weld quality was stabilized and improved.