The present work allows to comprehend a part of the theory behind the droplet temperature at the GMAW process. The development of an energy balance on the electrode is made to understand the power at the anode and by it the droplet temperature. To obtain the value and understand its behavior, it is necessary to understand the mass that evaporates from the droplet. The model generated allows to understand the behavior of the droplet, its evaporation, temperature, and deposition rate. The composition of the mass evaporated from the droplet is obtained, and the amount of energy lost in the process. A relation between the current and the WFS, evaporation rates and anode fall voltages is generated for different wire compositions. These relationships can be used to reduce evaporation and increase deposition rates, as also to study the behavior on new alloys and different conditions of voltage and WFS. The behavior of the droplet temperature is an important point for the manufacturers because it is what needs to be understood to control and reduce evaporation on the droplet.