This document presents the results of an experiment comparing the time-temperature profiles and weld properties of gas metal arc welding (GMAW), flux-cored arc welding (FCAW), and metal-cored arc welding (MCAW) processes. Time-temperature data was collected during welding and showed that FCAW reached the highest temperatures despite having the lowest heat input. Macrostructural images showed differences in weld reinforcement and porosity between the processes. Dimensional analysis found FCAW had the narrowest weld bead. Microstructural images revealed finer grains in FCAW and MCAW due to lower heat input. Microhardness testing showed welds from FCAW had the highest hardness.