Depending on the enclosure type and its operation conditions, different processes for welding and joining materials are being used. Welding and fusion welding are the most commonly used metods in our company. In the first case,work pieces are welded due to a combination of a pressure applied to them and a localized heat generated by a high electric current flowing through the contact area of the weld. When the current is stopped, the molten metal solidifies under pressure. Meanwhile, Arc welding is a type of welding that uses a welding power supply to create an electric arc between an electrode and the base material to melt the metals at the welding point. The vast majority of enclosures is produced with use of Electric resistance welding due to lower costs and time involved.