An apparatus for friction welding a first element to a second element includes a forge assembly having a table defining a platform, a crank, a forge link and a reaction link disposed oppositely of the forge link relative to the platform. The pixel circuit includes a driving transistor, a capacitor and a LED. Each yoke is connected to the frame and one of the tracks. An electric motor is electrically coupled to the AC terminal of the power inverter and has a chassis that is substantially electrically isolated from the AC terminal of the power inverter under normal operating conditions.