The series includes the tilting, head and tailstock rotation, head and tailstock lifting, head and tailstock tilting, and double rotation type positioners. With the working bench going up or down, rotating and overturning, the work piece will stay in the best position for being welded or assembled. The positioner can be completed with the welding manipulator and formed the automatic special welding machine. The positioner also can be completed with the auxiliaries of robot to realize the welding automation. At the same time, we can design and customize various types of positioner according to the technological requirements and varieties of different products given by the customers.