Aluminothermic or exothermic welding is the chemical process that allows two or more conductors to be joined together in a durable manner. It is mainly used in earthing systems due to its reliability, resistance and a series of advantages over other types of joints. Knowing whether it is properly carried out, how to calculate the necessary material or how to guarantee the safety of people in the event of a chemical reaction are the main questions answered by Aplicaciones Tecnológicas.