ETA Technology manufactures Friction Welding Machines of capacities varying from 10KN to 2000 KN. Small
machines of capacity upto 100KN are available in Vertical Design.
In small machines upto 60KN Capacity, the axial forces are applied by an AC servomotor through a ball screw.
Machines above 60KN use a hydraulic cylinder to apply the axial forces. In machines upto 200KN capacity a load cell is
used to measure the axial force on the job and it is controlled in a closed loop by means of a Servo valve.
The spindle is driven by an AC servo or an AC spindle motor and can be rapidly braked by line-regenerative braking.
Here the kinetic energy of rotation of the spindle is converted as electrical energy and fed back to the mains. In
machines where hydraulic cylinders are used for applying axial forces, the control is carried out by a hydraulic servo
valve. All important parameters like axial thrust, spindle speed, loss of length and spindle torque are read and plotted
on-line during welding. The Weld data of each and every weld can be archived and retrieved.
Spindle orientation can be done to facilitate welding of jobs like propeller shafts where two parts joined should have a
definite angular position.