Cartesian robots are used for pick and place work,  application of sealant,  assembly operations,  handling machine tools and arc welding.  It's a robot whese arm has three prismatic joints,  whose axes are coincidental with the Cartesian coordinators.
Application of Cartesian Robot Applying Adhesive This robot is being used to apply adhesive to a pane of glass.  This robot is capable of handling large sized work pieces.  Most laser cutters and CNC machines work on the principle simllar to this robot Pallet transfer Tnls orientation of a Cartesian robot transfers Integrated Circuits(ICs)  from a pallet and transfers the part to a specific place