SITEC equipments for resistance welding are special applications conceived, designed and manufactured according to specific needs, where the customer can produce with state-of-art technology and according to logics of wide flexibility. There are different kinds of equipments for resistance welding, as automatic production lines, robotic welding cells, Cartesian robots. Most of our systems use a medium frequency technology (inverter) to reach highest performances together a consistent reduction of weight in comparison to traditional spot welders working with power frequency (50Hz).