This kind of machine, butt welding machine, pvc welding machine, mobile welding machine adopts PLC touching screen control system. The power is pneumatic and step motor. It could insert and cut wire, flat mesh and foam board automatically, and the finished product, butt welding machine, pvc welding machine, mobile welding machine is a steel polystyrene splint. The production line has high automation and production efficient, low welding rate, high intensity and even welding point; the mesh sheet is also flat.