This equipment is specially designed for fully automatic butt welding of undermount slides, which can weld a square rail with two small hardware piece . The equipment adopts a 90KVA double-head butt welding machine, which can weld two small hardware piece simultaneously. The machine adopts manual methods to put square rails, one-person operation, compact design of the machine, convenient maintenance, man-machine interface, the whole machine adopts PLC automatic control system, simple operation, and fault indicator.