This 350 metric tonne (70K lb max., 311 kN max.) forge force direct drive friction welder has a 2000 max RPM rating and can weld 145 mm (5.71 in.)
The oldest form of rotary friction welding, the direct drive process continually adds energy using an electric motor driving the rotating component at a fixed RPM. The direct drive process accomplishes the same increase in energy through added cycle time instead of increased energy storage, allowing the parts to receive enough heat in the center of the parts to make a quality weld.