YHGQ-1200 NC gas pressure welding machine is a fully automatic welding machine with the working side centralizing, pressure-holding shearing, and pressure-holding normalizing, and the welding quality meets the requirements of Steel Welding standard TB/T1632-2005. The main technical levels and performance indexes reach or exceed the foreign the flash-butt welding machine like K922 and AMS60 etc, which makes the machine especially suitable for the plateau railway steel track welding. The machine is equipped with the special fixture for welding the 50, 60 and 75-track railways, and the fixture can be replaced according to the needs to achieve the unit welding, lock welding and folding lock welding for different types of tracks. The machine can carry out the welding not only for the new railways, subway and passenger railways, but also in the "roof" of existing railways, so it is the efficient and economic complete welding machine which is suitable for the actual construction of domestic railways and meets the quality standard.