The machine is used for PVC window and door welding processing; it can achieve the whole welding processing individually. It features advanced technology, reliable function, and easy operation. It adopts PC control, pneumatic driving and locating. The movable stand adopts non-oil lubricating bearing and linear ball bearing that make it of high precision, easy operation, and convenient maintenance. One of the machine heads can be used for welding processing with variable angles; it is also suitable for special shaped window welding like arch window. The 4 machine heads can be used individually, simultaneously or combinatively. It enable welding for such shapes as ┗ ┣ ┏┳ ┏┓ ┳ ┳┳ ┳┳┳ ┳┳╋ ╋╋╋ ╋╋ ╋ , is the ideal equipment for welding processing for PVC window and door.