Automatic line for welding and calendering of stainless steel tube of a maximum length of 700 mm and with a diameter ranging between 90 and 150 mm. This equipment includes automatic interlocking of the calender, pick-up unit for the calendered piece and introduction of the welding equipment where operations of gauging, alignment of the tube and TIG longitudinal welding take place. Once the welding phase has been completed, the piece is unloaded on a special slide while another calendered piece is simultaneously introduced into the welding equipment in order to reduce idle time to a minimum and thus increase production output.