Friction welding is a form of welding where heat is generated by pressure and movement at the interface in the area of the weld. Using a direct drive variation of friction welding, one component is attached to a motor driven unit, while the other is stationary. The component in motion is rotated to a predetermined constant speed. Once that speed is reached, the pieces are moved together and force is applied. Heat is generated as the surfaces rub together. This continues for a predetermined amount of time or until a preset amount of upset occurs. Friction welding is a low temperature, solid state welding process producing repeatable, high quality weld joints.