AUTO MFMW-IV series, Automatic Four Welding Heads Station is akind of high efficient flange fitting up and welding equipment. It is equipped with unique welding processing PLC control system, specially designed automatic tracking system and torch oscillating system. It is able to weld on inside and outside of flanges at both ends of fitted flanges synchronously. It can also realize different welding types such as one head one end, two heads one end, and two heads two ends as per welding requirements.