Comparison of Air Cylinder to Servo Motor on Resistance Welding Machine

Which is better for performing precision welding, a low-friction pneumatic cylinder or a servo motor?
High performance monitoring of the welding process makes the answer obvious. Under the dynamic
conditions that occur during weld formation, a good quality welder with a low friction pneumatic
cylinder reacts faster, with greater stability and repeatability than most of the servo motors presently
in widespread use on resistance welders. The result is more consistent applied electrode force and
higher quality welds than achievable with the servo motor-driven system.