Flash Butt Welding is a resistance welding process which involves joining two materials without gas or filler material. Two welding materials are clamped on the machine platen, one on the movable platen and the other on the fixed platen. The flashing stage of the flash butt welding process is to apply voltage while the movable platen advances towards the fixed platen. The melting and expulsion of the material on the faying surface of the two materials is the flash welding process. The flash welding terminates at the start of the butt-welding process.