The corrugator is a machine that allows production of expansion joints.  These joints are used for joining pipes.

The machine obtains joints by producing waves on a metal tube, each wave is created with the compression of a rubber, inside the tube, which induces localized expansion of the tube, the precision of the compression is possible by means of a servo-controlled piston. The working parameters for each type of joints are set on the machine computer, so they can be associated with a product code and stored.