Friction Welding

In friction welding, the heat is generated by the mechanical friction of the rotating parts. You have to make sure that the rotational speed and the axial pressure are matched so that the material in the weld zone becomes plastic but does not burn. If the pressure is too low, you won't get a clean weld; if it's too high, the material will upset away and the weld will be cold. The process basically runs on its own if you set the machine cleanly and the parts run smoothly without runout. After braking and the final upset, you have a tight, high-strength joint that usually doesn't need any post-treatment.